cleanup: Use arrow notation for anonymous functions

Arrow notation is great, use it consistently through-out the code base
to bind `this` to anonymous functions, replacing the more overbose
Lang.bind(this, function() {}).

https://gitlab.gnome.org/GNOME/gnome-shell/merge_requests/23

js/extensionPrefs/main.js

@@ -127,9 +127,7 @@ var Application = new Lang.Class({
         errortext += 'Stack trace:\n';
 
         // Indent stack trace.
-        errortext += exc.stack.split('\n').map(function(line) {
-            return '  ' + line;
-        }).join('\n');
+        errortext += exc.stack.split('\n').map(line => '  ' + line).join('\n');
 
         let scroll = new Gtk.ScrolledWindow({ vexpand: true });
         let buffer = new Gtk.TextBuffer({ text: errortext });
@@ -171,10 +169,10 @@ var Application = new Lang.Class({
 
 
         this._shellProxy = new GnomeShellProxy(Gio.DBus.session, 'org.gnome.Shell', '/org/gnome/Shell');
-        this._shellProxy.connectSignal('ExtensionStatusChanged', Lang.bind(this, function(proxy, senderName, [uuid, state, error]) {
+        this._shellProxy.connectSignal('ExtensionStatusChanged', (proxy, senderName, [uuid, state, error]) => {
             if (ExtensionUtils.extensions[uuid] !== undefined)
                 this._scanExtensions();
-        }));
+        });
 
         this._window.show_all();
     },
@@ -204,10 +202,9 @@ var Application = new Lang.Class({
         let row = new ExtensionRow(extension.uuid);
 
         row.prefsButton.visible = this._extensionAvailable(row.uuid);
-        row.prefsButton.connect('clicked', Lang.bind(this,
-            function() {
+        row.prefsButton.connect('clicked', () => {
             this._selectExtension(row.uuid);
-            }));
+        });
 
         row.show_all();
         this._extensionSelector.add(row);
@@ -275,18 +272,17 @@ var ExtensionRow = new Lang.Class({
         this.uuid = uuid;
 
         this._settings = new Gio.Settings({ schema_id: 'org.gnome.shell' });
-        this._settings.connect('changed::enabled-extensions', Lang.bind(this,
-            function() {
+        this._settings.connect('changed::enabled-extensions', () => {
             this._switch.state = this._isEnabled();
-            }));
+        });
         this._settings.connect('changed::disable-extension-version-validation',
-            Lang.bind(this, function() {
+            () => {
                 this._switch.sensitive = this._canEnable();
-            }));
+            });
         this._settings.connect('changed::disable-user-extensions',
-            Lang.bind(this, function() {
+            () => {
                 this._switch.sensitive = this._canEnable();
-            }));
+            });
 
         this._buildUI();
     },
@@ -328,14 +324,13 @@ var ExtensionRow = new Lang.Class({
         this._switch = new Gtk.Switch({ valign: Gtk.Align.CENTER,
                                         sensitive: this._canEnable(),
                                         state: this._isEnabled() });
-        this._switch.connect('notify::active', Lang.bind(this,
-            function() {
+        this._switch.connect('notify::active', () => {
             if (this._switch.active)
                 this._enable();
             else
                 this._disable();
-            }));
-        this._switch.connect('state-set', function() { return true; });
+        });
+        this._switch.connect('state-set', () => true);
         hbox.add(this._switch);
     },
 

js/gdm/authPrompt.js

@@ -64,7 +64,7 @@ var AuthPrompt = new Lang.Class({
         this._userVerifier.connect('ovirt-user-authenticated', Lang.bind(this, this._onOVirtUserAuthenticated));
         this.smartcardDetected = this._userVerifier.smartcardDetected;
 
-        this.connect('next', Lang.bind(this, function() {
+        this.connect('next', () => {
                 this.updateSensitivity(false);
                 this.startSpinning();
                 if (this._queryingService) {
@@ -72,18 +72,16 @@ var AuthPrompt = new Lang.Class({
                 } else {
                     this._preemptiveAnswer = this._entry.text;
                 }
-                     }));
+            });
 
         this.actor = new St.BoxLayout({ style_class: 'login-dialog-prompt-layout',
                                         vertical: true });
         this.actor.connect('destroy', Lang.bind(this, this._onDestroy));
-        this.actor.connect('key-press-event',
-                           Lang.bind(this, function(actor, event) {
-                               if (event.get_key_symbol() == Clutter.KEY_Escape) {
+        this.actor.connect('key-press-event', (actor, event) => {
+                if (event.get_key_symbol() == Clutter.KEY_Escape)
                     this.cancel();
-                               }
                 return Clutter.EVENT_PROPAGATE;
-                           }));
+            });
 
         this._userWell = new St.Bin({ x_fill: true,
                                       x_align: St.Align.START });
@@ -147,10 +145,7 @@ var AuthPrompt = new Lang.Class({
                                             reactive: true,
                                             can_focus: true,
                                             label: _("Cancel") });
-        this.cancelButton.connect('clicked',
-                                   Lang.bind(this, function() {
-                                       this.cancel();
-                                   }));
+        this.cancelButton.connect('clicked', () => { this.cancel(); });
         this._buttonBox.add(this.cancelButton,
                             { expand: false,
                               x_fill: false,
@@ -169,10 +164,7 @@ var AuthPrompt = new Lang.Class({
                                           reactive: true,
                                           can_focus: true,
                                           label: _("Next") });
-        this.nextButton.connect('clicked',
-                                 Lang.bind(this, function() {
-                                     this.emit('next');
-                                 }));
+        this.nextButton.connect('clicked', () => { this.emit('next'); });
         this.nextButton.add_style_pseudo_class('default');
         this._buttonBox.add(this.nextButton,
                             { expand: false,
@@ -183,17 +175,16 @@ var AuthPrompt = new Lang.Class({
 
         this._updateNextButtonSensitivity(this._entry.text.length > 0);
 
-        this._entry.clutter_text.connect('text-changed',
-                                         Lang.bind(this, function() {
+        this._entry.clutter_text.connect('text-changed', () => {
             if (!this._userVerifier.hasPendingMessages)
                 this._fadeOutMessage();
 
             this._updateNextButtonSensitivity(this._entry.text.length > 0 || this.verificationStatus == AuthPromptStatus.VERIFYING);
-                                         }));
-        this._entry.clutter_text.connect('activate', Lang.bind(this, function() {
+        });
+        this._entry.clutter_text.connect('activate', () => {
             if (this.nextButton.reactive)
                 this.emit('next');
-        }));
+        });
     },
 
     _onAskQuestion(verifier, serviceName, question, passwordChar) {
@@ -509,12 +500,11 @@ var AuthPrompt = new Lang.Class({
             return;
         }
 
-        let signalId = this._userVerifier.connect('no-more-messages',
-                                                  Lang.bind(this, function() {
+        let signalId = this._userVerifier.connect('no-more-messages', () => {
             this._userVerifier.disconnect(signalId);
             this._userVerifier.clear();
             onComplete();
-                                                  }));
+        });
     },
 
     cancel() {

js/gdm/batch.js

@@ -73,9 +73,7 @@ var Hold = new Lang.Class({
     Extends: Task,
 
     _init() {
-        this.parent(this, function () {
-            return this;
-        });
+        this.parent(this, () => this);
 
         this._acquisitions = 1;
     },
@@ -91,10 +89,10 @@ var Hold = new Lang.Class({
             return;
 
         this.acquire();
-        let signalId = hold.connect('release', Lang.bind(this, function() {
+        let signalId = hold.connect('release', () => {
             hold.disconnect(signalId);
             this.release();
-                                    }));
+        });
     },
 
     release() {
@@ -214,11 +212,10 @@ var ConsecutiveBatch = new Lang.Class({
        if (hold && hold.isAcquired()) {
            // This task is inhibiting the batch. Wait on it
            // before processing the next one.
-           let signalId = hold.connect('release',
-                                       Lang.bind(this, function() {
+           let signalId = hold.connect('release', () => {
                hold.disconnect(signalId);
                this.nextTask();
-                                       }));
+           });
            return;
        } else {
            // This task finished, process the next one

js/gdm/loginDialog.js

@@ -129,9 +129,8 @@ var UserListItem = new Lang.Class({
 
         let startTime = GLib.get_monotonic_time();
 
-        this._timedLoginTimeoutId = GLib.timeout_add (GLib.PRIORITY_DEFAULT,
-                                                      33,
-                                                      Lang.bind(this, function() {
+        this._timedLoginTimeoutId = GLib.timeout_add (GLib.PRIORITY_DEFAULT, 33,
+            () => {
                 let currentTime = GLib.get_monotonic_time();
                 let elapsedTime = (currentTime - startTime) / GLib.USEC_PER_SEC;
                 this._timedLoginIndicator.scale_x = elapsedTime / time;
@@ -142,7 +141,7 @@ var UserListItem = new Lang.Class({
                 }
 
                 return GLib.SOURCE_CONTINUE;
-                                                      }));
+            });
 
         GLib.Source.set_name_by_id(this._timedLoginTimeoutId, '[gnome-shell] this._timedLoginTimeoutId');
 
@@ -188,10 +187,10 @@ var UserList = new Lang.Class({
 
         let focusSet = this.actor.navigate_focus(null, Gtk.DirectionType.TAB_FORWARD, false);
         if (!focusSet) {
-            Meta.later_add(Meta.LaterType.BEFORE_REDRAW, Lang.bind(this, function() {
+            Meta.later_add(Meta.LaterType.BEFORE_REDRAW, () => {
                 this._moveFocusToItems();
                 return false;
-            }));
+            });
         }
     },
 
@@ -275,11 +274,7 @@ var UserList = new Lang.Class({
                      Lang.bind(this, this._onItemActivated));
 
         // Try to keep the focused item front-and-center
-        item.actor.connect('key-focus-in',
-                           Lang.bind(this,
-                                     function() {
-                                         this.scrollToItem(item);
-                                     }));
+        item.actor.connect('key-focus-in', () => { this.scrollToItem(item); });
 
         this._moveFocusToItems();
 
@@ -338,20 +333,17 @@ var SessionMenuButton = new Lang.Class({
         Main.uiGroup.add_actor(this._menu.actor);
         this._menu.actor.hide();
 
-        this._menu.connect('open-state-changed',
-                           Lang.bind(this, function(menu, isOpen) {
+        this._menu.connect('open-state-changed', (menu, isOpen) => {
              if (isOpen)
                  this._button.add_style_pseudo_class('active');
              else
                  this._button.remove_style_pseudo_class('active');
-                           }));
+        });
 
         this._manager = new PopupMenu.PopupMenuManager({ actor: this._button });
         this._manager.addMenu(this._menu);
 
-        this._button.connect('clicked', Lang.bind(this, function() {
-            this._menu.toggle();
-        }));
+        this._button.connect('clicked', () => { this._menu.toggle(); });
 
         this._items = {};
         this._activeSessionId = null;
@@ -403,10 +395,10 @@ var SessionMenuButton = new Lang.Class({
             this._menu.addMenuItem(item);
             this._items[id] = item;
 
-            item.connect('activate', Lang.bind(this, function() {
+            item.connect('activate', () => {
                 this.setActiveSession(id);
                 this.emit('session-activated', this._activeSessionId);
-            }));
+            });
         }
     }
 });
@@ -506,17 +498,16 @@ var LoginDialog = new Lang.Class({
         this.actor.add_child(this._logoBin);
         this._updateLogo();
 
-        this._userList.connect('activate',
-                               Lang.bind(this, function(userList, item) {
+        this._userList.connect('activate', (userList, item) => {
             this._onUserListActivated(item);
-                               }));
+        });
 
 
         this._sessionMenuButton = new SessionMenuButton();
         this._sessionMenuButton.connect('session-activated',
-                                  Lang.bind(this, function(list, sessionId) {
+            (list, sessionId) => {
                 this._greeter.call_select_session_sync (sessionId, null);
-                                            }));
+            });
         this._sessionMenuButton.actor.opacity = 0;
         this._sessionMenuButton.actor.show();
         this._authPrompt.addActorToDefaultButtonWell(this._sessionMenuButton.actor);
@@ -724,13 +715,13 @@ var LoginDialog = new Lang.Class({
     _ensureUserListLoaded() {
         if (!this._userManager.is_loaded) {
             this._userManagerLoadedId = this._userManager.connect('notify::is-loaded',
-                                                                  Lang.bind(this, function() {
+                () => {
                     if (this._userManager.is_loaded) {
                         this._loadUserList();
                         this._userManager.disconnect(this._userManagerLoadedId);
                         this._userManagerLoadedId = 0;
                     }
-                                                                  }));
+                });
         } else {
             let id = GLib.idle_add(GLib.PRIORITY_DEFAULT, Lang.bind(this, this._loadUserList));
             GLib.Source.set_name_by_id(id, '[gnome-shell] _loadUserList');
@@ -907,7 +898,7 @@ var LoginDialog = new Lang.Class({
         if (this._nextSignalId)
             this._authPrompt.disconnect(this._nextSignalId);
         this._nextSignalId = this._authPrompt.connect('next',
-                                                      Lang.bind(this, function() {
+            () => {
                 this._authPrompt.disconnect(this._nextSignalId);
                 this._nextSignalId = 0;
                 this._authPrompt.updateSensitivity(false);
@@ -917,7 +908,7 @@ var LoginDialog = new Lang.Class({
                 this._authPrompt.startSpinning();
                 this._authPrompt.begin({ userName: answer });
                 this._updateCancelButton();
-                                                      }));
+            });
         this._updateCancelButton();
 
         this._sessionMenuButton.updateSensitivity(false);
@@ -952,10 +943,10 @@ var LoginDialog = new Lang.Class({
     _gotGreeterSessionProxy(proxy) {
         this._greeterSessionProxy = proxy;
         this._greeterSessionProxyChangedId =
-            proxy.connect('g-properties-changed', Lang.bind(this, function() {
+            proxy.connect('g-properties-changed', () => {
                 if (proxy.Active)
                     this._loginScreenSessionActivated();
-            }));
+            });
     },
 
     _startSession(serviceName) {
@@ -979,9 +970,7 @@ var LoginDialog = new Lang.Class({
     },
 
     _onSessionOpened(client, serviceName) {
-        this._authPrompt.finish(Lang.bind(this, function() {
-            this._startSession(serviceName);
-        }));
+        this._authPrompt.finish(() => { this._startSession(serviceName); });
     },
 
     _waitForItemForUser(userName) {
@@ -992,16 +981,14 @@ var LoginDialog = new Lang.Class({
 
         let hold = new Batch.Hold();
         let signalId = this._userList.connect('item-added',
-                                              Lang.bind(this, function() {
+            () => {
                 let item = this._userList.getItemFromUserName(userName);
 
                 if (item)
                     hold.release();
-                                              }));
+            });
 
-        hold.connect('release', Lang.bind(this, function() {
-                         this._userList.disconnect(signalId);
-                     }));
+        hold.connect('release', () => { this._userList.disconnect(signalId); });
 
         return hold;
     },
@@ -1024,7 +1011,7 @@ var LoginDialog = new Lang.Class({
         let hold = new Batch.Hold();
 
         this._timedLoginIdleTimeOutId = Mainloop.timeout_add_seconds(_TIMED_LOGIN_IDLE_THRESHOLD,
-                                                                     function() {
+            () => {
                 this._timedLoginAnimationTime -= _TIMED_LOGIN_IDLE_THRESHOLD;
                 hold.release();
                 return GLib.SOURCE_REMOVE;
@@ -1038,15 +1025,13 @@ var LoginDialog = new Lang.Class({
         this._timedLoginDelay = delay;
         this._timedLoginAnimationTime = delay;
 
-        let tasks = [function() {
-                         return this._waitForItemForUser(userName);
-                     },
+        let tasks = [() => this._waitForItemForUser(userName),
 
-                     function() {
+                     () => {
                          this._timedLoginItem = this._userList.getItemFromUserName(userName);
                      },
 
-                     function() {
+                     () => {
                          // If we're just starting out, start on the right
                          // item.
                          if (!this._userManager.is_loaded) {
@@ -1056,13 +1041,13 @@ var LoginDialog = new Lang.Class({
 
                      this._blockTimedLoginUntilIdle,
 
-                     function() {
+                     () => {
                          this._userList.scrollToItem(this._timedLoginItem);
                      },
 
                      this._showTimedLoginAnimation,
 
-                     function() {
+                     () => {
                          this._timedLoginBatch = null;
                          this._greeter.call_begin_auto_login_sync(userName, null);
                      }];
@@ -1090,8 +1075,7 @@ var LoginDialog = new Lang.Class({
     _onTimedLoginRequested(client, userName, seconds) {
         this._startTimedLogin(userName, seconds);
 
-        global.stage.connect('captured-event',
-                             Lang.bind(this, function(actor, event) {
+        global.stage.connect('captured-event', (actor, event) => {
            if (this._timedLoginDelay == undefined)
                return Clutter.EVENT_PROPAGATE;
 
@@ -1107,7 +1091,7 @@ var LoginDialog = new Lang.Class({
            }
 
            return Clutter.EVENT_PROPAGATE;
-                             }));
+        });
     },
 
     _setUserListExpanded(expanded) {
@@ -1218,25 +1202,25 @@ var LoginDialog = new Lang.Class({
         this._updateDisableUserList();
 
         this._userAddedId = this._userManager.connect('user-added',
-                                                      Lang.bind(this, function(userManager, user) {
+            (userManager, user) => {
                 this._userList.addUser(user);
                 this._updateDisableUserList();
-                                                      }));
+            });
 
         this._userRemovedId = this._userManager.connect('user-removed',
-                                                        Lang.bind(this, function(userManager, user) {
+            (userManager, user) => {
                 this._userList.removeUser(user);
                 this._updateDisableUserList();
-                                                        }));
+            });
 
         this._userChangedId = this._userManager.connect('user-changed',
-                                                        Lang.bind(this, function(userManager, user) {
+            (userManager, user) => {
                 if (this._userList.containsUser(user) && user.locked)
                     this._userList.removeUser(user);
                 else if (!this._userList.containsUser(user) && !user.locked)
                     this._userList.addUser(user);
                 this._updateDisableUserList();
-                                                        }));
+            });
 
         return GLib.SOURCE_REMOVE;
     },

js/gdm/realmd.js

@@ -70,10 +70,10 @@ var Manager = new Lang.Class({
         this._realms = {};
 
         this._signalId = this._aggregateProvider.connect('g-properties-changed',
-                                        Lang.bind(this, function(proxy, properties) {
+            (proxy, properties) => {
                 if ('Realms' in properties.deep_unpack())
                     this._reloadRealms();
-                                        }));
+            });
     },
 
     _reloadRealms() {
@@ -109,11 +109,10 @@ var Manager = new Lang.Class({
 
         this._reloadRealm(realm);
 
-        realm.connect('g-properties-changed',
-                      Lang.bind(this, function(proxy, properties) {
+        realm.connect('g-properties-changed', (proxy, properties) => {
             if ('Configured' in properties.deep_unpack())
                 this._reloadRealm(realm);
-                                }));
+        });
     },
 
     _updateLoginFormat() {
@@ -146,9 +145,7 @@ var Manager = new Lang.Class({
         Service(Gio.DBus.system,
                 'org.freedesktop.realmd',
                 '/org/freedesktop/realmd',
-                function(service) {
-                    service.ReleaseRemote();
-                });
+                service => { service.ReleaseRemote(); });
         this._aggregateProvider.disconnect(this._signalId);
         this._realms = { };
         this._updateLoginFormat();

js/gdm/util.js

@@ -230,11 +230,10 @@ var ShellUserVerifier = new Lang.Class({
         if (!this.hasPendingMessages) {
             this._userVerifier.call_answer_query(serviceName, answer, this._cancellable, null);
         } else {
-            let signalId = this.connect('no-more-messages',
-                                        Lang.bind(this, function() {
+            let signalId = this.connect('no-more-messages', () => {
                 this.disconnect(signalId);
                 this._userVerifier.call_answer_query(serviceName, answer, this._cancellable, null);
-                                        }));
+            });
         }
     },
 
@@ -268,11 +267,11 @@ var ShellUserVerifier = new Lang.Class({
 
         this._messageQueueTimeoutId = GLib.timeout_add(GLib.PRIORITY_DEFAULT,
                                                        message.interval,
-                                                       Lang.bind(this, function() {
+                                                       () => {
                                                            this._messageQueueTimeoutId = 0;
                                                            this._queueMessageTimeout();
                                                            return GLib.SOURCE_REMOVE;
-                                                       }));
+                                                       });
         GLib.Source.set_name_by_id(this._messageQueueTimeoutId, '[gnome-shell] this._queueMessageTimeout');
     },
 
@@ -303,13 +302,13 @@ var ShellUserVerifier = new Lang.Class({
             return;
         }
 
-        this._fprintManager.GetDefaultDeviceRemote(Gio.DBusCallFlags.NONE, this._cancellable, Lang.bind(this,
-            function(device, error) {
+        this._fprintManager.GetDefaultDeviceRemote(Gio.DBusCallFlags.NONE, this._cancellable,
+            (device, error) => {
                 if (!error && device) {
                     this._haveFingerprintReader = true;
                     this._updateDefaultService();
                 }
-            }));
+            });
     },
 
     _oVirtUserAuthenticated(token) {
@@ -432,7 +431,7 @@ var ShellUserVerifier = new Lang.Class({
            this._userVerifier.call_begin_verification_for_user(serviceName,
                                                                this._userName,
                                                                this._cancellable,
-                                                               Lang.bind(this, function(obj, result) {
+                                                               (obj, result) => {
                try {
                    obj.call_begin_verification_for_user_finish(result);
                } catch(e if e.matches(Gio.IOErrorEnum, Gio.IOErrorEnum.CANCELLED)) {
@@ -443,11 +442,11 @@ var ShellUserVerifier = new Lang.Class({
                }
 
                this._hold.release();
-           }));
+           });
         } else {
            this._userVerifier.call_begin_verification(serviceName,
                                                       this._cancellable,
-                                                      Lang.bind(this, function(obj, result) {
+                                                      (obj, result) => {
                try {
                    obj.call_begin_verification_finish(result);
                } catch(e if e.matches(Gio.IOErrorEnum, Gio.IOErrorEnum.CANCELLED)) {
@@ -458,7 +457,7 @@ var ShellUserVerifier = new Lang.Class({
                }
 
                this._hold.release();
-           }));
+           });
         }
     },
 
@@ -546,22 +545,20 @@ var ShellUserVerifier = new Lang.Class({
             if (!this.hasPendingMessages) {
                 this._retry();
             } else {
-                let signalId = this.connect('no-more-messages',
-                                            Lang.bind(this, function() {
+                let signalId = this.connect('no-more-messages', () => {
                     this.disconnect(signalId);
                     if (this._cancellable && !this._cancellable.is_cancelled())
                         this._retry();
-                                            }));
+                });
             }
         } else {
             if (!this.hasPendingMessages) {
                 this._cancelAndReset();
             } else {
-                let signalId = this.connect('no-more-messages',
-                                            Lang.bind(this, function() {
+                let signalId = this.connect('no-more-messages', () => {
                     this.disconnect(signalId);
                     this._cancelAndReset();
-                                            }));
+                });
             }
         }
 

js/misc/ibusManager.js

@@ -126,7 +126,7 @@ var IBusManager = new Lang.Class({
             } catch (e) {
             }
             // If an engine is already active we need to get its properties
-            this._ibus.get_global_engine_async(-1, null, Lang.bind(this, function(i, result) {
+            this._ibus.get_global_engine_async(-1, null, (i, result) => {
                 let engine;
                 try {
                     engine = this._ibus.get_global_engine_async_finish(result);
@@ -136,7 +136,7 @@ var IBusManager = new Lang.Class({
                     return;
                 }
                 this._engineChanged(this._ibus, engine.get_name());
-            }));
+            });
             this._updateReadiness();
         } else {
             this._clear();
@@ -159,7 +159,7 @@ var IBusManager = new Lang.Class({
             return;
 
         this._registerPropertiesId =
-            this._panelService.connect('register-properties', Lang.bind(this, function(p, props) {
+            this._panelService.connect('register-properties', (p, props) => {
                 if (!props.get(0))
                     return;
 
@@ -167,7 +167,7 @@ var IBusManager = new Lang.Class({
                 this._registerPropertiesId = 0;
 
                 this.emit('properties-registered', this._currentEngineName, props);
-            }));
+            });
     },
 
     _updateProperty(panel, prop) {
@@ -214,7 +214,7 @@ var IBusManager = new Lang.Class({
 
         this._preloadEnginesId =
             Mainloop.timeout_add_seconds(this._PRELOAD_ENGINES_DELAY_TIME,
-                                         Lang.bind(this, function() {
+                                         () => {
                                              this._ibus.preload_engines_async(
                                                  ids,
                                                  -1,
@@ -222,7 +222,7 @@ var IBusManager = new Lang.Class({
                                                  null);
                                              this._preloadEnginesId = 0;
                                              return GLib.SOURCE_REMOVE;
-                                         }));
+                                         });
     },
 });
 Signals.addSignalMethods(IBusManager.prototype);

js/misc/inputMethod.js

@@ -59,8 +59,8 @@ var InputMethod = new Lang.Class({
 
     _setContext(bus, res) {
         this._context = this._ibus.create_input_context_async_finish(res);
-        this._context.connect('enabled', Lang.bind(this, function () { this._enabled = true }));
-        this._context.connect('disabled', Lang.bind(this, function () { this._enabled = false }));
+        this._context.connect('enabled', () => { this._enabled = true });
+        this._context.connect('disabled', () => { this._enabled = false });
         this._context.connect('commit-text', Lang.bind(this, this._onCommitText));
         this._context.connect('delete-surrounding-text', Lang.bind(this, this._onDeleteSurroundingText));
         this._context.connect('update-preedit-text', Lang.bind(this, this._onUpdatePreeditText));
@@ -201,14 +201,14 @@ var InputMethod = new Lang.Class({
         this._context.process_key_event_async(event.get_key_symbol(),
                                               event.get_key_code() - 8, // Convert XKB keycodes to evcodes
                                               state, -1, null,
-                                              Lang.bind(this, (context, res) => {
+                                              (context, res) => {
                                                   try {
                                                       let retval = context.process_key_event_async_finish(res);
                                                       this.notify_key_event(event, retval);
                                                   } catch (e) {
                                                       log('Error processing key on IM: ' + e.message);
                                                   }
-                                              }));
+                                              });
         return true;
     },
 });

js/misc/jsParse.js

@@ -23,9 +23,9 @@ function getCompletions(text, commandHeader, globalCompletionList) {
         if (matches) {
             [expr, base, attrHead] = matches;
 
-            methods = getPropertyNamesFromExpression(base, commandHeader).filter(function(attr) {
-                return attr.slice(0, attrHead.length) == attrHead;
-            });
+            methods = getPropertyNamesFromExpression(base, commandHeader).filter(
+                attr => attr.slice(0, attrHead.length) == attrHead
+            );
         }
 
         // Look for the empty expression or partially entered words
@@ -33,9 +33,9 @@ function getCompletions(text, commandHeader, globalCompletionList) {
         matches = text.match(/^(\w*)$/);
         if (text == '' || matches) {
             [expr, attrHead] = matches;
-            methods = globalCompletionList.filter(function(attr) {
-                return attr.slice(0, attrHead.length) == attrHead;
-            });
+            methods = globalCompletionList.filter(
+                attr => attr.slice(0, attrHead.length) == attrHead
+            );
         }
     }
 
@@ -175,7 +175,7 @@ function getPropertyNamesFromExpression(expr, commandHeader) {
 
         // Make sure propsUnique contains one key for every
         // property so we end up with a unique list of properties
-        allProps.map(function(p){ propsUnique[p] = null; });
+        allProps.map(p => propsUnique[p] = null);
     }
     return Object.keys(propsUnique).sort();
 }
@@ -233,7 +233,7 @@ function isUnsafeExpression(str) {
 // Returns a list of global keywords derived from str
 function getDeclaredConstants(str) {
     let ret = [];
-    str.split(';').forEach(function(s) {
+    str.split(';').forEach(s => {
         let base, keyword;
         let match = s.match(/const\s+(\w+)\s*=/);
         if (match) {

js/misc/keyboardManager.js

@@ -138,8 +138,8 @@ var KeyboardManager = new Lang.Class({
 
     _buildGroupStrings(_group) {
         let group = _group.concat(this._localeLayoutInfo);
-        let layouts = group.map(function(g) { return g.layout; }).join(',');
-        let variants = group.map(function(g) { return g.variant; }).join(',');
+        let layouts = group.map(g => g.layout).join(',');
+        let variants = group.map(g => g.variant).join(',');
         return [layouts, variants];
     },
 

js/misc/loginManager.js

@@ -125,8 +125,7 @@ var LoginManagerSystemd = new Lang.Class({
             return;
         }
 
-        this._proxy.GetSessionRemote(sessionId, Lang.bind(this,
-            function(result, error) {
+        this._proxy.GetSessionRemote(sessionId, (result, error) => {
             if (error) {
                 logError(error, 'Could not get a proxy for the current session');
             } else {
@@ -135,11 +134,11 @@ var LoginManagerSystemd = new Lang.Class({
                                                                result[0]);
                 callback(this._currentSession);
             }
-            }));
+        });
     },
 
     canSuspend(asyncCallback) {
-        this._proxy.CanSuspendRemote(function(result, error) {
+        this._proxy.CanSuspendRemote((result, error) => {
             if (error) {
                 asyncCallback(false, false);
             } else {
@@ -151,7 +150,7 @@ var LoginManagerSystemd = new Lang.Class({
     },
 
     listSessions(asyncCallback) {
-        this._proxy.ListSessionsRemote(function(result, error) {
+        this._proxy.ListSessionsRemote((result, error) => {
             if (error)
                 asyncCallback([]);
             else
@@ -170,7 +169,7 @@ var LoginManagerSystemd = new Lang.Class({
                                           reason,
                                           'delay']);
         this._proxy.call_with_unix_fd_list('Inhibit', inVariant, 0, -1, null, null,
-            Lang.bind(this, function(proxy, result) {
+            (proxy, result) => {
                 let fd = -1;
                 try {
                     let [outVariant, fdList] = proxy.call_with_unix_fd_list_finish(result);
@@ -180,7 +179,7 @@ var LoginManagerSystemd = new Lang.Class({
                     logError(e, "Error getting systemd inhibitor");
                     callback(null);
                 }
-            }));
+            });
     },
 
     _prepareForSleep(proxy, sender, [aboutToSuspend]) {

js/misc/modemManager.js

@@ -140,15 +140,15 @@ var ModemGsm = new Lang.Class({
         this.operator_name = null;
 
         // Code is duplicated because the function have different signatures
-        this._proxy.connectSignal('SignalQuality', Lang.bind(this, function(proxy, sender, [quality]) {
+        this._proxy.connectSignal('SignalQuality', (proxy, sender, [quality]) => {
             this.signal_quality = quality;
             this.emit('notify::signal-quality');
-        }));
-        this._proxy.connectSignal('RegistrationInfo', Lang.bind(this, function(proxy, sender, [status, code, name]) {
+        });
+        this._proxy.connectSignal('RegistrationInfo', (proxy, sender, [status, code, name]) => {
             this.operator_name = _findProviderForMccMnc(name, code);
             this.emit('notify::operator-name');
-        }));
-        this._proxy.GetRegistrationInfoRemote(Lang.bind(this, function([result], err) {
+        });
+        this._proxy.GetRegistrationInfoRemote(([result], err) => {
             if (err) {
                 log(err);
                 return;
@@ -157,8 +157,8 @@ var ModemGsm = new Lang.Class({
             let [status, code, name] = result;
             this.operator_name = _findProviderForMccMnc(name, code);
             this.emit('notify::operator-name');
-        }));
-        this._proxy.GetSignalQualityRemote(Lang.bind(this, function(result, err) {
+        });
+        this._proxy.GetSignalQualityRemote((result, err) => {
             if (err) {
                 // it will return an error if the device is not connected
                 this.signal_quality = 0;
@@ -167,7 +167,7 @@ var ModemGsm = new Lang.Class({
                 this.signal_quality = quality;
             }
             this.emit('notify::signal-quality');
-        }));
+        });
     }
 });
 Signals.addSignalMethods(ModemGsm.prototype);
@@ -180,7 +180,7 @@ var ModemCdma = new Lang.Class({
 
         this.signal_quality = 0;
         this.operator_name = null;
-        this._proxy.connectSignal('SignalQuality', Lang.bind(this, function(proxy, sender, params) {
+        this._proxy.connectSignal('SignalQuality', (proxy, sender, params) => {
             this.signal_quality = params[0];
             this.emit('notify::signal-quality');
 
@@ -188,8 +188,8 @@ var ModemCdma = new Lang.Class({
             // and we can finally call GetServingSystem
             if (this.operator_name == null)
                 this._refreshServingSystem();
-        }));
-        this._proxy.GetSignalQualityRemote(Lang.bind(this, function(result, err) {
+        });
+        this._proxy.GetSignalQualityRemote((result, err) => {
             if (err) {
                 // it will return an error if the device is not connected
                 this.signal_quality = 0;
@@ -198,11 +198,11 @@ var ModemCdma = new Lang.Class({
                 this.signal_quality = quality;
             }
             this.emit('notify::signal-quality');
-        }));
+        });
     },
 
     _refreshServingSystem() {
-        this._proxy.GetServingSystemRemote(Lang.bind(this, function([result], err) {
+        this._proxy.GetServingSystemRemote(([result], err) => {
             if (err) {
                 // it will return an error if the device is not connected
                 this.operator_name = null;
@@ -212,7 +212,7 @@ var ModemCdma = new Lang.Class({
                 this.operator_name = _findProviderForSid(sid)
             }
             this.emit('notify::operator-name');
-        }));
+        });
     }
 });
 Signals.addSignalMethods(ModemCdma.prototype);
@@ -253,24 +253,24 @@ var BroadbandModem = new Lang.Class({
         this._proxy_cdma = new BroadbandModemCdmaProxy(Gio.DBus.system, 'org.freedesktop.ModemManager1', path);
         this._capabilities = capabilities;
 
-        this._proxy.connect('g-properties-changed', Lang.bind(this, function(proxy, properties) {
+        this._proxy.connect('g-properties-changed', (proxy, properties) => {
             if ('SignalQuality' in properties.deep_unpack())
                 this._reloadSignalQuality();
-        }));
+        });
         this._reloadSignalQuality();
 
-        this._proxy_3gpp.connect('g-properties-changed', Lang.bind(this, function(proxy, properties) {
+        this._proxy_3gpp.connect('g-properties-changed', (proxy, properties) => {
             let unpacked = properties.deep_unpack();
             if ('OperatorName' in unpacked || 'OperatorCode' in unpacked)
                 this._reload3gppOperatorName();
-        }));
+        });
         this._reload3gppOperatorName();
 
-        this._proxy_cdma.connect('g-properties-changed', Lang.bind(this, function(proxy, properties) {
+        this._proxy_cdma.connect('g-properties-changed', (proxy, properties) => {
             let unpacked = properties.deep_unpack();
             if ('Nid' in unpacked || 'Sid' in unpacked)
                 this._reloadCdmaOperatorName();
-        }));
+        });
         this._reloadCdmaOperatorName();
     },
 

js/misc/objectManager.js

@@ -93,7 +93,7 @@ var ObjectManager = new Lang.Class({
 
         proxy.init_async(GLib.PRIORITY_DEFAULT,
                          this._cancellable,
-                         Lang.bind(this, function(initable, result) {
+                         (initable, result) => {
                let error = null;
                try {
                    initable.init_finish(result);
@@ -127,7 +127,7 @@ var ObjectManager = new Lang.Class({
 
                if (onFinished)
                    onFinished();
-        }));
+        });
     },
 
     _removeInterface(objectPath, interfaceName) {
@@ -168,35 +168,35 @@ var ObjectManager = new Lang.Class({
         }
 
         this._managerProxy.connectSignal('InterfacesAdded',
-                                         Lang.bind(this, function(objectManager, sender, [objectPath, interfaces]) {
+                                         (objectManager, sender, [objectPath, interfaces]) => {
                                              let interfaceNames = Object.keys(interfaces);
                                              for (let i = 0; i < interfaceNames.length; i++)
                                                  this._addInterface(objectPath, interfaceNames[i]);
-                                         }));
+                                         });
         this._managerProxy.connectSignal('InterfacesRemoved',
-                                         Lang.bind(this, function(objectManager, sender, [objectPath, interfaceNames]) {
+                                         (objectManager, sender, [objectPath, interfaceNames]) => {
                                              for (let i = 0; i < interfaceNames.length; i++)
                                                  this._removeInterface(objectPath, interfaceNames[i]);
-                                         }));
+                                         });
 
         if (Object.keys(this._interfaceInfos).length == 0) {
             this._tryToCompleteLoad();
             return;
         }
 
-        this._managerProxy.connect('notify::g-name-owner', Lang.bind(this, function() {
+        this._managerProxy.connect('notify::g-name-owner', () => {
             if (this._managerProxy.g_name_owner)
                 this._onNameAppeared();
             else
                 this._onNameVanished();
-        }));
+        });
 
         if (this._managerProxy.g_name_owner)
             this._onNameAppeared();
     },
 
     _onNameAppeared() {
-        this._managerProxy.GetManagedObjectsRemote(Lang.bind(this, function(result, error) {
+        this._managerProxy.GetManagedObjectsRemote((result, error) => {
             if (!result) {
                 if (error) {
                    logError(error, 'could not get remote objects for service ' + this._serviceName + ' path ' + this._managerPath);
@@ -230,7 +230,7 @@ var ObjectManager = new Lang.Class({
                 }
             }
             this._tryToCompleteLoad();
-        }));
+        });
     },
 
     _onNameVanished() {

js/misc/smartcardManager.js

@@ -43,15 +43,15 @@ var SmartcardManager = new Lang.Class({
         for (let i = 0; i < tokens.length; i++)
             this._addToken(tokens[i]);
 
-        this._objectManager.connect('interface-added', Lang.bind(this, function(objectManager, interfaceName, proxy) {
+        this._objectManager.connect('interface-added', (objectManager, interfaceName, proxy) => {
             if (interfaceName == 'org.gnome.SettingsDaemon.Smartcard.Token')
                 this._addToken(proxy);
-        }));
+        });
 
-        this._objectManager.connect('interface-removed', Lang.bind(this, function(objectManager, interfaceName, proxy) {
+        this._objectManager.connect('interface-removed', (objectManager, interfaceName, proxy) => {
             if (interfaceName == 'org.gnome.SettingsDaemon.Smartcard.Token')
                 this._removeToken(proxy);
-        }));
+        });
     },
 
     _updateToken(token) {
@@ -69,8 +69,7 @@ var SmartcardManager = new Lang.Class({
     _addToken(token) {
         this._updateToken(token);
 
-        token.connect('g-properties-changed',
-                      Lang.bind(this, function(proxy, properties) {
+        token.connect('g-properties-changed', (proxy, properties) => {
             if ('IsInserted' in properties.deep_unpack()) {
                 this._updateToken(token);
 
@@ -80,7 +79,7 @@ var SmartcardManager = new Lang.Class({
                     this.emit('smartcard-removed', token);
                 }
             }
-                      }));
+        });
 
         // Emit a smartcard-inserted at startup if it's already plugged in
         if (token.IsInserted)

js/misc/systemActions.js

@@ -410,7 +410,7 @@ const SystemActions = new Lang.Class({
         if (Main.screenShield)
             Main.screenShield.lock(false);
 
-        Clutter.threads_add_repaint_func_full(Clutter.RepaintFlags.POST_PAINT, function() {
+        Clutter.threads_add_repaint_func_full(Clutter.RepaintFlags.POST_PAINT, () => {
             Gdm.goto_login_session_sync(null);
             return false;
         });

js/misc/util.js

@@ -136,7 +136,7 @@ function trySpawn(argv)
     // Dummy child watch; we don't want to double-fork internally
     // because then we lose the parent-child relationship, which
     // can break polkit.  See https://bugzilla.redhat.com//show_bug.cgi?id=819275
-    GLib.child_watch_add(GLib.PRIORITY_DEFAULT, pid, function () {});
+    GLib.child_watch_add(GLib.PRIORITY_DEFAULT, pid, () => {});
 }
 
 // trySpawnCommandLine:
@@ -291,12 +291,10 @@ function createTimeLabel(date, params) {
         _desktopSettings = new Gio.Settings({ schema_id: 'org.gnome.desktop.interface' });
 
     let label = new St.Label({ text: formatTime(date, params) });
-    let id = _desktopSettings.connect('changed::clock-format', function() {
+    let id = _desktopSettings.connect('changed::clock-format', () => {
         label.text = formatTime(date, params);
     });
-    label.connect('destroy', function() {
-        _desktopSettings.disconnect(id);
-    });
+    label.connect('destroy', () => { _desktopSettings.disconnect(id); });
     return label;
 }
 
@@ -316,7 +314,7 @@ function createTimeLabel(date, params) {
 
 function lowerBound(array, val, cmp) {
     let min, max, mid, v;
-    cmp = cmp || function(a, b) { return a - b; };
+    cmp = cmp || ((a, b) => a - b);
 
     if (array.length == 0)
         return 0;

js/perf/core.js

@@ -75,7 +75,7 @@ function run() {
     // Enable recording of timestamps for different points in the frame cycle
     global.frame_timestamps = true;
 
-    Main.overview.connect('shown', function() {
+    Main.overview.connect('shown', () => {
         Scripting.scriptEvent('overviewShowDone');
     });
 

js/perf/hwtest.js

@@ -42,35 +42,29 @@ function waitAndDraw(milliseconds) {
     let timeline = new Clutter.Timeline({ duration: milliseconds });
     timeline.start();
 
-    timeline.connect('new-frame',
-        function(timeline, frame) {
+    timeline.connect('new-frame', (timeline, frame) => {
         global.stage.queue_redraw();
     });
 
-    timeline.connect('completed',
-        function() {
+    timeline.connect('completed', () => {
         timeline.stop();
         if (cb)
             cb();
     });
 
-    return function(callback) {
-        cb = callback;
-    };
+    return callback => { cb = callback; };
 }
 
 function waitSignal(object, signal) {
     let cb;
 
-    let id = object.connect(signal, function() {
+    let id = object.connect(signal, () => {
         object.disconnect(id);
         if (cb)
             cb();
     });
 
-    return function(callback) {
-        cb = callback;
-    };
+    return callback => { cb = callback; };
 }
 
 function extractBootTimestamp() {
@@ -270,7 +264,7 @@ function script_redrawTestDone(time) {
 function script_collectTimings(time) {
     for (let timing in redrawTimes) {
         let times = redrawTimes[timing];
-        times.sort(function(a, b) { return a - b });
+        times.sort((a, b) => a - b);
 
         let len = times.length;
         let median;

js/portalHelper/main.js

@@ -357,9 +357,9 @@ var WebPortalHelper = new Lang.Class({
         if (top.window != null)
             return;
 
-        top.window = new PortalWindow(this, top.url, top.timestamp, Lang.bind(this, function(result) {
+        top.window = new PortalWindow(this, top.url, top.timestamp, result => {
             this._dbusImpl.emit_signal('Done', new GLib.Variant('(ou)', [top.connection, result]));
-        }));
+        });
     },
 });
 

js/ui/altTab.js

@@ -372,10 +372,10 @@ var AppSwitcherPopup = new Lang.Class({
                          { opacity: 0,
                            time: THUMBNAIL_FADE_TIME,
                            transition: 'easeOutQuad',
-                           onComplete: Lang.bind(this, function() {
+                           onComplete: () => {
                                thumbnailsActor.destroy();
                                this.thumbnailsVisible = false;
-                                                        })
+                           }
                          });
         this._thumbnails = null;
         if  (this._switcherList._items[this._selectedIndex])
@@ -403,7 +403,7 @@ var AppSwitcherPopup = new Lang.Class({
                          { opacity: 255,
                            time: THUMBNAIL_FADE_TIME,
                            transition: 'easeOutQuad',
-                           onComplete: Lang.bind(this, function () { this.thumbnailsVisible = true; })
+                           onComplete: () => { this.thumbnailsVisible = true; }
                          });
 
         this._switcherList._items[this._selectedIndex].add_accessible_state (Atk.StateType.EXPANDED);
@@ -678,9 +678,9 @@ var AppSwitcher = new Lang.Class({
             let appIcon = new AppIcon(apps[i]);
             // Cache the window list now; we don't handle dynamic changes here,
             // and we don't want to be continually retrieving it
-            appIcon.cachedWindows = allWindows.filter(function(w) {
-                return windowTracker.get_window_app (w) == appIcon.app;
-            });
+            appIcon.cachedWindows = allWindows.filter(
+                w => windowTracker.get_window_app (w) == appIcon.app
+            );
             if (appIcon.cachedWindows.length > 0)
                 this._addIcon(appIcon);
         }
@@ -721,9 +721,7 @@ var AppSwitcher = new Lang.Class({
         let availWidth = primary.width - parentPadding - this.actor.get_theme_node().get_horizontal_padding();
 
         let scaleFactor = St.ThemeContext.get_for_stage(global.stage).scale_factor;
-        let iconSizes = baseIconSizes.map(function(s) {
-            return s * scaleFactor;
-        });
+        let iconSizes = baseIconSizes.map(s => s * scaleFactor);
 
         if (this._items.length == 1) {
             this._iconSize = baseIconSizes[0];
@@ -775,11 +773,11 @@ var AppSwitcher = new Lang.Class({
             Mainloop.source_remove(this._mouseTimeOutId);
         if (this._altTabPopup.thumbnailsVisible) {
             this._mouseTimeOutId = Mainloop.timeout_add(APP_ICON_HOVER_TIMEOUT,
-                                                        Lang.bind(this, function () {
+                                                        () => {
                                                             this._enterItem(index);
                                                             this._mouseTimeOutId = 0;
                                                             return GLib.SOURCE_REMOVE;
-                                                        }));
+                                                        });
             GLib.Source.set_name_by_id(this._mouseTimeOutId, '[gnome-shell] this._enterItem');
         } else
            this._itemEntered(index);
@@ -829,7 +827,7 @@ var AppSwitcher = new Lang.Class({
 
         let n = this._arrows.length;
         let arrow = new St.DrawingArea({ style_class: 'switcher-arrow' });
-        arrow.connect('repaint', function() { SwitcherPopup.drawArrow(arrow, St.Side.BOTTOM); });
+        arrow.connect('repaint', () => { SwitcherPopup.drawArrow(arrow, St.Side.BOTTOM); });
         this._list.add_actor(arrow);
         this._arrows.push(arrow);
 

js/ui/appDisplay.js

@@ -129,9 +129,9 @@ var BaseAppView = new Lang.Class({
         else
             this._grid = new IconGrid.IconGrid(gridParams);
 
-        this._grid.connect('key-focus-in', Lang.bind(this, function(grid, actor) {
+        this._grid.connect('key-focus-in', (grid, actor) => {
             this._keyFocusIn(actor);
-        }));
+        });
         // Standard hack for ClutterBinLayout
         this._grid.actor.x_expand = true;
 
@@ -173,9 +173,7 @@ var BaseAppView = new Lang.Class({
 
     loadGrid() {
         this._allItems.sort(this._compareItems);
-        this._allItems.forEach(Lang.bind(this, function(item) {
-            this._grid.addItem(item);
-        }));
+        this._allItems.forEach(item => { this._grid.addItem(item); });
         this.emit('view-loaded');
     },
 
@@ -191,18 +189,19 @@ var BaseAppView = new Lang.Class({
             this._selectAppInternal(id);
         } else if (this._items[id]) {
             // Need to wait until the view is mapped
-            let signalId = this._items[id].actor.connect('notify::mapped', Lang.bind(this, function(actor) {
+            let signalId = this._items[id].actor.connect('notify::mapped',
+                actor => {
                     if (actor.mapped) {
                         actor.disconnect(signalId);
                         this._selectAppInternal(id);
                     }
-            }));
+                });
         } else {
             // Need to wait until the view is built
-            let signalId = this.connect('view-loaded', Lang.bind(this, function() {
+            let signalId = this.connect('view-loaded', () => {
                 this.disconnect(signalId);
                 this.selectApp(id);
-            }));
+            });
         }
     },
 
@@ -214,11 +213,10 @@ var BaseAppView = new Lang.Class({
 
     animate(animationDirection, onComplete) {
         if (onComplete) {
-            let animationDoneId = this._grid.connect('animation-done', Lang.bind(this,
-                function () {
+            let animationDoneId = this._grid.connect('animation-done', () => {
                 this._grid.disconnect(animationDoneId);
                 onComplete();
-            }));
+            });
         }
 
         if (animationDirection == IconGrid.AnimationDirection.IN) {
@@ -244,7 +242,7 @@ var BaseAppView = new Lang.Class({
         } else {
             params.opacity = 0;
             params.delay = 0;
-            params.onComplete = Lang.bind(this, function() { this.actor.hide() });
+            params.onComplete = () => { this.actor.hide(); };
         }
 
         Tweener.addTween(this._grid.actor, params);
@@ -284,11 +282,9 @@ var PageIndicators = new Lang.Class({
         this._nPages = 0;
         this._currentPage = undefined;
 
-        this.actor.connect('notify::mapped',
-                           Lang.bind(this, function() {
+        this.actor.connect('notify::mapped', () => {
             this.animateIndicators(IconGrid.AnimationDirection.IN);
-                           })
-                          );
+        });
     },
 
     setNPages(nPages) {
@@ -306,10 +302,9 @@ var PageIndicators = new Lang.Class({
                                                 toggle_mode: true,
                                                 checked: pageIndex == this._currentPage });
                 indicator.child = new St.Widget({ style_class: 'page-indicator-icon' });
-                indicator.connect('clicked', Lang.bind(this,
-                    function() {
+                indicator.connect('clicked', () => {
                     this.emit('page-activated', pageIndex);
-                    }));
+                });
                 this.actor.add_actor(indicator);
             }
         } else {
@@ -391,10 +386,10 @@ var AllView = new Lang.Class({
         this._adjustment = this._scrollView.vscroll.adjustment;
 
         this._pageIndicators = new PageIndicators();
-        this._pageIndicators.connect('page-activated', Lang.bind(this,
-            function(indicators, pageIndex) {
+        this._pageIndicators.connect('page-activated',
+            (indicators, pageIndex) => {
                 this.goToPage(pageIndex);
-            }));
+            });
         this._pageIndicators.actor.connect('scroll-event', Lang.bind(this, this._onScroll));
         this.actor.add_actor(this._pageIndicators.actor);
 
@@ -421,7 +416,7 @@ var AllView = new Lang.Class({
         this._scrollView.add_action(panAction);
         this._panning = false;
         this._clickAction = new Clutter.ClickAction();
-        this._clickAction.connect('clicked', Lang.bind(this, function() {
+        this._clickAction.connect('clicked', () => {
             if (!this._currentPopup)
                 return;
 
@@ -429,7 +424,7 @@ var AllView = new Lang.Class({
             let actor = global.stage.get_actor_at_pos(Clutter.PickMode.ALL, x, y);
             if (!this._currentPopup.actor.contains(actor))
                 this._currentPopup.popdown();
-        }));
+        });
         this._eventBlocker.add_action(this._clickAction);
 
         this._displayingPopup = false;
@@ -437,25 +432,19 @@ var AllView = new Lang.Class({
         this._availWidth = 0;
         this._availHeight = 0;
 
-        Main.overview.connect('hidden', Lang.bind(this,
-            function() {
-                this.goToPage(0);
-            }));
-        this._grid.connect('space-opened', Lang.bind(this,
-            function() {
+        Main.overview.connect('hidden', () => { this.goToPage(0); });
+        this._grid.connect('space-opened', () => {
             let fadeEffect = this._scrollView.get_effect('fade');
             if (fadeEffect)
                 fadeEffect.enabled = false;
 
             this.emit('space-ready');
-            }));
-        this._grid.connect('space-closed', Lang.bind(this,
-            function() {
+        });
+        this._grid.connect('space-closed', () => {
             this._displayingPopup = false;
-            }));
+        });
 
-        this.actor.connect('notify::mapped', Lang.bind(this,
-            function() {
+        this.actor.connect('notify::mapped', () => {
             if (this.actor.mapped) {
                 this._keyPressEventId =
                     global.stage.connect('key-press-event',
@@ -465,17 +454,17 @@ var AllView = new Lang.Class({
                     global.stage.disconnect(this._keyPressEventId);
                 this._keyPressEventId = 0;
             }
-            }));
+        });
 
         this._redisplayWorkId = Main.initializeDeferredWork(this.actor, Lang.bind(this, this._redisplay));
 
-        Shell.AppSystem.get_default().connect('installed-changed', Lang.bind(this, function() {
+        Shell.AppSystem.get_default().connect('installed-changed', () => {
             Main.queueDeferredWork(this._redisplayWorkId);
-        }));
+        });
         this._folderSettings = new Gio.Settings({ schema_id: 'org.gnome.desktop.app-folders' });
-        this._folderSettings.connect('changed::folder-children', Lang.bind(this, function() {
+        this._folderSettings.connect('changed::folder-children', () => {
             Main.queueDeferredWork(this._redisplayWorkId);
-        }));
+        });
     },
 
     removeAll() {
@@ -495,43 +484,41 @@ var AllView = new Lang.Class({
     },
 
     _refilterApps() {
-        this._allItems.forEach(function(icon) {
+        this._allItems.forEach(icon => {
             if (icon instanceof AppIcon)
                 icon.actor.visible = true;
         });
 
-        this.folderIcons.forEach(Lang.bind(this, function(folder) {
+        this.folderIcons.forEach(folder => {
             let folderApps = folder.getAppIds();
-            folderApps.forEach(Lang.bind(this, function(appId) {
+            folderApps.forEach(appId => {
                 let appIcon = this._items[appId];
                 appIcon.actor.visible = false;
-            }));
-        }));
+            });
+        });
     },
 
     _loadApps() {
-        let apps = Gio.AppInfo.get_all().filter(function(appInfo) {
+        let apps = Gio.AppInfo.get_all().filter(appInfo => {
             try {
                 let id = appInfo.get_id(); // catch invalid file encodings
             } catch(e) {
                 return false;
             }
             return appInfo.should_show();
-        }).map(function(app) {
-            return app.get_id();
-        });
+        }).map(app => app.get_id());
 
         let appSys = Shell.AppSystem.get_default();
 
         let folders = this._folderSettings.get_strv('folder-children');
-        folders.forEach(Lang.bind(this, function(id) {
+        folders.forEach(id => {
             let path = this._folderSettings.path + 'folders/' + id + '/';
             let icon = new FolderIcon(id, path, this);
             icon.connect('name-changed', Lang.bind(this, this._itemNameChanged));
             icon.connect('apps-changed', Lang.bind(this, this._refilterApps));
             this.addItem(icon);
             this.folderIcons.push(icon);
-        }));
+        });
 
         // Allow dragging of the icon only if the Dash would accept a drop to
         // change favorite-apps. There are no other possible drop targets from
@@ -541,13 +528,13 @@ var AllView = new Lang.Class({
         // but we hope that is not used much.
         let favoritesWritable = global.settings.is_writable('favorite-apps');
 
-        apps.forEach(Lang.bind(this, function(appId) {
+        apps.forEach(appId => {
             let app = appSys.lookup_app(appId);
 
             let icon = new AppIcon(app,
                                    { isDraggable: favoritesWritable });
             this.addItem(icon);
-        }));
+        });
 
         this.loadGrid();
         this._refilterApps();
@@ -556,24 +543,23 @@ var AllView = new Lang.Class({
     // Overriden from BaseAppView
     animate(animationDirection, onComplete) {
         this._scrollView.reactive = false;
-        let completionFunc = Lang.bind(this, function() {
+        let completionFunc = () => {
             this._scrollView.reactive = true;
             if (onComplete)
                 onComplete();
-        });
+        };
 
         if (animationDirection == IconGrid.AnimationDirection.OUT &&
             this._displayingPopup && this._currentPopup) {
             this._currentPopup.popdown();
-            let spaceClosedId = this._grid.connect('space-closed', Lang.bind(this,
-                function() {
+            let spaceClosedId = this._grid.connect('space-closed', () => {
                 this._grid.disconnect(spaceClosedId);
                 // Given that we can't call this.parent() inside the
                 // signal handler, call again animate which will
                 // call the parent given that popup is already
                 // closed.
                 this.animate(animationDirection, completionFunc);
-                }));
+            });
         } else {
             this.parent(animationDirection, completionFunc);
             if (animationDirection == IconGrid.AnimationDirection.OUT)
@@ -725,14 +711,13 @@ var AllView = new Lang.Class({
 
     addFolderPopup(popup) {
         this._stack.add_actor(popup.actor);
-        popup.connect('open-state-changed', Lang.bind(this,
-            function(popup, isOpen) {
+        popup.connect('open-state-changed', (popup, isOpen) => {
             this._eventBlocker.reactive = isOpen;
             this._currentPopup = isOpen ? popup : null;
             this._updateIconOpacities(isOpen);
             if(!isOpen)
                 this._closeSpaceForPopup();
-            }));
+        });
     },
 
     _keyFocusIn(icon) {
@@ -779,11 +764,10 @@ var AllView = new Lang.Class({
         if (this._availWidth != availWidth || this._availHeight != availHeight || oldNPages != this._grid.nPages()) {
             this._adjustment.value = 0;
             this._grid.currentPage = 0;
-            Meta.later_add(Meta.LaterType.BEFORE_REDRAW, Lang.bind(this,
-                function() {
+            Meta.later_add(Meta.LaterType.BEFORE_REDRAW, () => {
                 this._pageIndicators.setNPages(this._grid.nPages());
                 this._pageIndicators.setCurrentPage(0);
-                }));
+            });
         }
 
         this._availWidth = availWidth;
@@ -821,10 +805,10 @@ var FrequentView = new Lang.Class({
 
         this._usage = Shell.AppUsage.get_default();
 
-        this.actor.connect('notify::mapped', Lang.bind(this, function() {
+        this.actor.connect('notify::mapped', () => {
             if (this.actor.mapped)
                 this._redisplay();
-        }));
+        });
     },
 
     hasUsefulData() {
@@ -951,8 +935,7 @@ var AppDisplay = new Lang.Class({
         let layout = new ControlsBoxLayout({ homogeneous: true });
         this._controls = new St.Widget({ style_class: 'app-view-controls',
                                          layout_manager: layout });
-        this._controls.connect('notify::mapped', Lang.bind(this,
-            function() {
+        this._controls.connect('notify::mapped', () => {
             // controls are faded either with their parent or
             // explicitly in animate(); we can't know how they'll be
             // shown next, so make sure to restore their opacity
@@ -962,7 +945,7 @@ var AppDisplay = new Lang.Class({
 
             Tweener.removeTweens(this._controls);
             this._controls.opacity = 255;
-            }));
+        });
 
         layout.hookup_style(this._controls);
         this.actor.add_actor(new St.Bin({ child: this._controls }));
@@ -972,11 +955,10 @@ var AppDisplay = new Lang.Class({
             this._controls.add_actor(this._views[i].control);
 
             let viewIndex = i;
-            this._views[i].control.connect('clicked', Lang.bind(this,
-                function(actor) {
+            this._views[i].control.connect('clicked', actor => {
                 this._showView(viewIndex);
                 global.settings.set_uint('app-picker-view', viewIndex);
-                }));
+            });
         }
         let initialView = Math.min(global.settings.get_uint('app-picker-view'),
                                    this._views.length - 1);
@@ -989,10 +971,10 @@ var AppDisplay = new Lang.Class({
         Gio.DBus.system.watch_name(SWITCHEROO_BUS_NAME,
                                    Gio.BusNameWatcherFlags.NONE,
                                    Lang.bind(this, this._switcherooProxyAppeared),
-                                   Lang.bind(this, function() {
+                                   () => {
                                        this._switcherooProxy = null;
                                        this._updateDiscreteGpuAvailable();
-                                   }));
+                                   });
     },
 
     _updateDiscreteGpuAvailable() {
@@ -1004,13 +986,13 @@ var AppDisplay = new Lang.Class({
 
     _switcherooProxyAppeared() {
         this._switcherooProxy = new SwitcherooProxy(Gio.DBus.system, SWITCHEROO_BUS_NAME, SWITCHEROO_OBJECT_PATH,
-            Lang.bind(this, function(proxy, error) {
+            (proxy, error) => {
                 if (error) {
                     log(error.message);
                     return;
                 }
                 this._updateDiscreteGpuAvailable();
-            }));
+            });
     },
 
     animate(animationDirection, onComplete) {
@@ -1053,9 +1035,7 @@ var AppDisplay = new Lang.Class({
         let enabled = this._privacySettings.get_boolean('remember-app-usage');
         this._views[Views.FREQUENT].control.visible = enabled;
 
-        let visibleViews = this._views.filter(function(v) {
-            return v.control.visible;
-        });
+        let visibleViews = this._views.filter(v => v.control.visible);
         this._controls.visible = visibleViews.length > 1;
 
         if (!enabled && this._views[Views.FREQUENT].view.actor.visible)
@@ -1129,14 +1109,14 @@ var AppSearchProvider = new Lang.Class({
         let groups = Shell.AppSystem.search(query);
         let usage = Shell.AppUsage.get_default();
         let results = [];
-        groups.forEach(function(group) {
-            group = group.filter(function(appID) {
+        groups.forEach(group => {
+            group = group.filter(appID => {
                 let app = Gio.DesktopAppInfo.new(appID);
                 return app && app.should_show();
             });
-            results = results.concat(group.sort(function(a, b) {
-                return usage.compare('', a, b);
-            }));
+            results = results.concat(group.sort(
+                (a, b) => usage.compare('', a, b)
+            ));
         });
 
         results = results.concat(this._systemActions.getMatchingActions(terms));
@@ -1295,26 +1275,22 @@ var FolderIcon = new Lang.Class({
 
         this.view = new FolderView();
 
-        this.actor.connect('clicked', Lang.bind(this,
-            function() {
+        this.actor.connect('clicked', () => {
             this._ensurePopup();
             this.view.actor.vscroll.adjustment.value = 0;
             this._openSpaceForPopup();
-            }));
-        this.actor.connect('notify::mapped', Lang.bind(this,
-            function() {
+        });
+        this.actor.connect('notify::mapped', () => {
             if (!this.actor.mapped && this._popup)
                 this._popup.popdown();
-            }));
+        });
 
         this._folder.connect('changed', Lang.bind(this, this._redisplay));
         this._redisplay();
     },
 
     getAppIds() {
-        return this.view.getAllItems().map(function(item) {
-            return item.id;
-        });
+        return this.view.getAllItems().map(item => item.id);
     },
 
     _updateName() {
@@ -1334,7 +1310,7 @@ var FolderIcon = new Lang.Class({
 
         let excludedApps = this._folder.get_strv('excluded-apps');
         let appSys = Shell.AppSystem.get_default();
-        let addAppId = (function addAppId(appId) {
+        let addAppId = appId => {
             if (excludedApps.indexOf(appId) >= 0)
                 return;
 
@@ -1347,13 +1323,13 @@ var FolderIcon = new Lang.Class({
 
             let icon = new AppIcon(app);
             this.view.addItem(icon);
-        }).bind(this);
+        };
 
         let folderApps = this._folder.get_strv('apps');
         folderApps.forEach(addAppId);
 
         let folderCategories = this._folder.get_strv('categories');
-        Gio.AppInfo.get_all().forEach(function(appInfo) {
+        Gio.AppInfo.get_all().forEach(appInfo => {
             let appCategories = _getCategories(appInfo);
             if (!_listsIntersect(folderCategories, appCategories))
                 return;
@@ -1379,12 +1355,11 @@ var FolderIcon = new Lang.Class({
     },
 
     _openSpaceForPopup() {
-        let id = this._parentView.connect('space-ready', Lang.bind(this,
-            function() {
+        let id = this._parentView.connect('space-ready', () => {
             this._parentView.disconnect(id);
             this._popup.popup();
             this._updatePopupPosition();
-            }));
+        });
         this._parentView.openSpaceForPopup(this, this._boxPointerArrowside, this.view.nRowsDisplayedAtOnce());
     },
 
@@ -1424,11 +1399,10 @@ var FolderIcon = new Lang.Class({
         if (!this._popup) {
             this._popup = new AppFolderPopup(this, this._boxPointerArrowside);
             this._parentView.addFolderPopup(this._popup);
-            this._popup.connect('open-state-changed', Lang.bind(this,
-                function(popup, isOpen) {
+            this._popup.connect('open-state-changed', (popup, isOpen) => {
                 if (!isOpen)
                     this.actor.checked = false;
-                }));
+            });
         } else {
             this._popup.updateArrowSide(this._boxPointerArrowside);
         }
@@ -1490,10 +1464,7 @@ var AppFolderPopup = new Lang.Class({
 
         global.focus_manager.add_group(this.actor);
 
-        source.actor.connect('destroy', Lang.bind(this,
-            function() {
-                this.actor.destroy();
-            }));
+        source.actor.connect('destroy', () => { this.actor.destroy(); });
         this._grabHelper = new GrabHelper.GrabHelper(this.actor);
         this._grabHelper.addActor(Main.layoutManager.overviewGroup);
         this.actor.connect('key-press-event', Lang.bind(this, this._onKeyPress));
@@ -1569,11 +1540,10 @@ var AppFolderPopup = new Lang.Class({
         this._view.actor.opacity = 0;
         this._boxPointer.show(BoxPointer.PopupAnimation.FADE |
                               BoxPointer.PopupAnimation.SLIDE,
-                              Lang.bind(this,
-            function() {
+                              () => {
                 this._view.actor.opacity = 255;
                 this._view.animate(IconGrid.AnimationDirection.IN);
-            }));
+            });
 
         this.emit('open-state-changed', true);
     },
@@ -1663,28 +1633,24 @@ var AppIcon = new Lang.Class({
 
         if (isDraggable) {
             this._draggable = DND.makeDraggable(this.actor);
-            this._draggable.connect('drag-begin', Lang.bind(this,
-                function () {
+            this._draggable.connect('drag-begin', () => {
                 this._removeMenuTimeout();
                 Main.overview.beginItemDrag(this);
-                }));
-            this._draggable.connect('drag-cancelled', Lang.bind(this,
-                function () {
+            });
+            this._draggable.connect('drag-cancelled', () => {
                 Main.overview.cancelledItemDrag(this);
-                }));
-            this._draggable.connect('drag-end', Lang.bind(this,
-                function () {
+            });
+            this._draggable.connect('drag-end', () => {
                Main.overview.endItemDrag(this);
-                }));
+            });
         }
 
         this.actor.connect('destroy', Lang.bind(this, this._onDestroy));
 
         this._menuTimeoutId = 0;
-        this._stateChangedId = this.app.connect('notify::state', Lang.bind(this,
-            function () {
+        this._stateChangedId = this.app.connect('notify::state', () => {
             this._updateRunningStyle();
-            }));
+        });
         this._updateRunningStyle();
     },
 
@@ -1715,12 +1681,11 @@ var AppIcon = new Lang.Class({
 
     _setPopupTimeout() {
         this._removeMenuTimeout();
-        this._menuTimeoutId = Mainloop.timeout_add(MENU_POPUP_TIMEOUT,
-            Lang.bind(this, function() {
+        this._menuTimeoutId = Mainloop.timeout_add(MENU_POPUP_TIMEOUT, () => {
             this._menuTimeoutId = 0;
             this.popupMenu();
             return GLib.SOURCE_REMOVE;
-            }));
+        });
         GLib.Source.set_name_by_id(this._menuTimeoutId, '[gnome-shell] this.popupMenu');
     },
 
@@ -1770,15 +1735,17 @@ var AppIcon = new Lang.Class({
 
         if (!this._menu) {
             this._menu = new AppIconMenu(this);
-            this._menu.connect('activate-window', Lang.bind(this, function (menu, window) {
+            this._menu.connect('activate-window', (menu, window) => {
                 this.activateWindow(window);
-            }));
-            this._menu.connect('open-state-changed', Lang.bind(this, function (menu, isPoppedUp) {
+            });
+            this._menu.connect('open-state-changed', (menu, isPoppedUp) => {
                 if (!isPoppedUp)
                     this._onMenuPoppedDown();
-            }));
-            let id = Main.overview.connect('hiding', Lang.bind(this, function () { this._menu.close(); }));
-            this.actor.connect('destroy', function() {
+            });
+            let id = Main.overview.connect('hiding', () => {
+                this._menu.close();
+            });
+            this.actor.connect('destroy', () => {
                 Main.overview.disconnect(id);
             });
 
@@ -1888,9 +1855,9 @@ var AppIconMenu = new Lang.Class({
     _redisplay() {
         this.removeAll();
 
-        let windows = this._source.app.get_windows().filter(function(w) {
-            return !w.skip_taskbar;
-        });
+        let windows = this._source.app.get_windows().filter(
+            w => !w.skip_taskbar
+        );
 
         // Display the app windows menu items and the separator between windows
         // of the current desktop and other windows.
@@ -1904,9 +1871,9 @@ var AppIconMenu = new Lang.Class({
                 separatorShown = true;
             }
             let item = this._appendMenuItem(window.title);
-            item.connect('activate', Lang.bind(this, function() {
+            item.connect('activate', () => {
                 this.emit('activate-window', window);
-            }));
+            });
         }
 
         if (!this._source.app.is_window_backed()) {
@@ -1917,13 +1884,13 @@ var AppIconMenu = new Lang.Class({
             if (this._source.app.can_open_new_window() &&
                 actions.indexOf('new-window') == -1) {
                 this._newWindowMenuItem = this._appendMenuItem(_("New Window"));
-                this._newWindowMenuItem.connect('activate', Lang.bind(this, function() {
+                this._newWindowMenuItem.connect('activate', () => {
                     if (this._source.app.state == Shell.AppState.STOPPED)
                         this._source.animateLaunch();
 
                     this._source.app.open_new_window(-1);
                     this.emit('activate-window', null);
-                }));
+                });
                 this._appendSeparator();
             }
 
@@ -1931,22 +1898,22 @@ var AppIconMenu = new Lang.Class({
                 this._source.app.state == Shell.AppState.STOPPED &&
                 actions.indexOf('activate-discrete-gpu') == -1) {
                 this._onDiscreteGpuMenuItem = this._appendMenuItem(_("Launch using Dedicated Graphics Card"));
-                this._onDiscreteGpuMenuItem.connect('activate', Lang.bind(this, function() {
+                this._onDiscreteGpuMenuItem.connect('activate', () => {
                     if (this._source.app.state == Shell.AppState.STOPPED)
                         this._source.animateLaunch();
 
                     this._source.app.launch(0, -1, true);
                     this.emit('activate-window', null);
-                }));
+                });
             }
 
             for (let i = 0; i < actions.length; i++) {
                 let action = actions[i];
                 let item = this._appendMenuItem(appInfo.get_action_name(action));
-                item.connect('activate', Lang.bind(this, function(emitter, event) {
+                item.connect('activate', (emitter, event) => {
                     this._source.app.launch_action(action, event.get_time(), -1);
                     this.emit('activate-window', null);
-                }));
+                });
             }
 
             let canFavorite = global.settings.is_writable('favorite-apps');
@@ -1958,27 +1925,26 @@ var AppIconMenu = new Lang.Class({
 
                 if (isFavorite) {
                     let item = this._appendMenuItem(_("Remove from Favorites"));
-                    item.connect('activate', Lang.bind(this, function() {
+                    item.connect('activate', () => {
                         let favs = AppFavorites.getAppFavorites();
                         favs.removeFavorite(this._source.app.get_id());
-                    }));
+                    });
                 } else {
                     let item = this._appendMenuItem(_("Add to Favorites"));
-                    item.connect('activate', Lang.bind(this, function() {
+                    item.connect('activate', () => {
                         let favs = AppFavorites.getAppFavorites();
                         favs.addFavorite(this._source.app.get_id());
-                    }));
+                    });
                 }
             }
 
             if (Shell.AppSystem.get_default().lookup_app('org.gnome.Software.desktop')) {
                 this._appendSeparator();
                 let item = this._appendMenuItem(_("Show Details"));
-                item.connect('activate', Lang.bind(this, function() {
+                item.connect('activate', () => {
                     let id = this._source.app.get_id();
                     let args = GLib.Variant.new('(ss)', [id, '']);
-                    Gio.DBus.get(Gio.BusType.SESSION, null,
-                        function(o, res) {
+                    Gio.DBus.get(Gio.BusType.SESSION, null, (o, res) => {
                         let bus = Gio.DBus.get_finish(res);
                         bus.call('org.gnome.Software',
                                  '/org/gnome/Software',
@@ -1988,7 +1954,7 @@ var AppIconMenu = new Lang.Class({
                                  null, 0, -1, null, null);
                         Main.overview.hide();
                     });
-                }));
+                });
             }
         }
     },

js/ui/appFavorites.js

@@ -66,7 +66,7 @@ var AppFavorites = new Lang.Class({
 
         // Map old desktop file names to the current ones
         let updated = false;
-        ids = ids.map(function (id) {
+        ids = ids.map(id => {
             let newId = RENAMED_DESKTOP_IDS[id];
             if (newId !== undefined &&
                 appSys.lookup_app(newId) != null) {
@@ -79,11 +79,8 @@ var AppFavorites = new Lang.Class({
         if (updated)
             global.settings.set_strv(this.FAVORITE_APPS_KEY, ids);
 
-        let apps = ids.map(function (id) {
-                return appSys.lookup_app(id);
-            }).filter(function (app) {
-                return app != null;
-            });
+        let apps = ids.map(id => appSys.lookup_app(id))
+                      .filter(app => app != null);
         this._favorites = {};
         for (let i = 0; i < apps.length; i++) {
             let app = apps[i];
@@ -140,9 +137,9 @@ var AppFavorites = new Lang.Class({
 
         Main.overview.setMessage(_("%s has been added to your favorites.").format(app.get_name()),
                                  { forFeedback: true,
-                                   undoCallback: Lang.bind(this, function () {
+                                   undoCallback: () => {
                                        this._removeFavorite(appId);
-                                                           })
+                                   }
                                  });
     },
 
@@ -159,7 +156,7 @@ var AppFavorites = new Lang.Class({
         if (!appId in this._favorites)
             return false;
 
-        let ids = this._getIds().filter(function (id) { return id != appId; });
+        let ids = this._getIds().filter(id => id != appId);
         global.settings.set_strv(this.FAVORITE_APPS_KEY, ids);
         return true;
     },
@@ -174,9 +171,9 @@ var AppFavorites = new Lang.Class({
 
         Main.overview.setMessage(_("%s has been removed from your favorites.").format(app.get_name()),
                                  { forFeedback: true,
-                                   undoCallback: Lang.bind(this, function () {
+                                   undoCallback: () => {
                                        this._addFavorite(appId, pos);
-                                                           })
+                                   }
                                  });
     }
 });

js/ui/audioDeviceSelection.js

@@ -101,10 +101,8 @@ var AudioDeviceSelectionDialog = new Lang.Class({
     _addDevice(device) {
         let box = new St.BoxLayout({ style_class: 'audio-selection-device-box',
                                      vertical: true });
-        box.connect('notify::height',
-            function() {
-                Meta.later_add(Meta.LaterType.BEFORE_REDRAW,
-                    function() {
+        box.connect('notify::height', () => {
+            Meta.later_add(Meta.LaterType.BEFORE_REDRAW, () => {
                 box.width = box.height;
             });
         });
@@ -123,12 +121,11 @@ var AudioDeviceSelectionDialog = new Lang.Class({
                                      child: box });
         this._selectionBox.add(button);
 
-        button.connect('clicked', Lang.bind(this,
-            function() {
+        button.connect('clicked', () => {
             this.emit('device-selected', device);
             this.close();
             Main.overview.hide();
-            }));
+        });
     },
 
     _openSettings() {
@@ -166,9 +163,8 @@ var AudioDeviceSelectionDBus = new Lang.Class({
         let connection = this._dbusImpl.get_connection();
         let info = this._dbusImpl.get_info();
         let deviceName = Object.keys(AudioDevice).filter(
-            function(dev) {
-                return AudioDevice[dev] == device;
-            })[0].toLowerCase();
+            dev => AudioDevice[dev] == device
+        )[0].toLowerCase();
         connection.emit_signal(this._audioSelectionDialog._sender,
                                this._dbusImpl.get_object_path(),
                                info ? info.name : null,
@@ -184,9 +180,7 @@ var AudioDeviceSelectionDBus = new Lang.Class({
 
         let [deviceNames] = params;
         let devices = 0;
-        deviceNames.forEach(function(n) {
-            devices |= AudioDevice[n.toUpperCase()];
-        });
+        deviceNames.forEach(n => { devices |= AudioDevice[n.toUpperCase()]; });
 
         let dialog;
         try {

js/ui/background.js

@@ -154,13 +154,13 @@ var BackgroundCache = new Lang.Class({
 
         let monitor = file.monitor(Gio.FileMonitorFlags.NONE, null);
         monitor.connect('changed',
-                        Lang.bind(this, function(obj, file, otherFile, eventType) {
+                        (obj, file, otherFile, eventType) => {
                             // Ignore CHANGED and CREATED events, since in both cases
                             // we'll get a CHANGES_DONE_HINT event when done.
                             if (eventType != Gio.FileMonitorEvent.CHANGED &&
                                 eventType != Gio.FileMonitorEvent.CREATED)
                                 this.emit('file-changed', file);
-                        }));
+                        });
 
         this._fileMonitors[key] = monitor;
     },
@@ -173,10 +173,10 @@ var BackgroundCache = new Lang.Class({
         let animation = this._animations[params.settingsSchema];
         if (animation && _fileEqual0(animation.file, params.file)) {
             if (params.onLoaded) {
-                let id = GLib.idle_add(GLib.PRIORITY_DEFAULT, Lang.bind(this, function() {
+                let id = GLib.idle_add(GLib.PRIORITY_DEFAULT, () => {
                     params.onLoaded(this._animations[params.settingsSchema]);
                     return GLib.SOURCE_REMOVE;
-                }));
+                });
                 GLib.Source.set_name_by_id(id, '[gnome-shell] params.onLoaded');
             }
             return;
@@ -184,17 +184,17 @@ var BackgroundCache = new Lang.Class({
 
         animation = new Animation({ file: params.file });
 
-        animation.load(Lang.bind(this, function() {
+        animation.load(() => {
             this._animations[params.settingsSchema] = animation;
 
             if (params.onLoaded) {
-                               let id = GLib.idle_add(GLib.PRIORITY_DEFAULT, Lang.bind(this, function() {
+                let id = GLib.idle_add(GLib.PRIORITY_DEFAULT, () => {
                     params.onLoaded(this._animations[params.settingsSchema]);
                     return GLib.SOURCE_REMOVE;
-                               }));
+                });
                 GLib.Source.set_name_by_id(id, '[gnome-shell] params.onLoaded');
             }
-                       }));
+        });
     },
 
     getBackgroundSource(layoutManager, settingsSchema) {
@@ -254,10 +254,10 @@ var Background = new Lang.Class({
 
         this._clock = new GnomeDesktop.WallClock();
         this._timezoneChangedId = this._clock.connect('notify::timezone',
-            Lang.bind(this, function() {
+            () => {
                 if (this._animation)
                     this._loadAnimation(this._animation.file);
-            }));
+            });
 
         let loginManager = LoginManager.getLoginManager();
         this._prepareForSleepId = loginManager.connect('prepare-for-sleep',
@@ -267,9 +267,9 @@ var Background = new Lang.Class({
                 this._refreshAnimation();
             });
 
-        this._settingsChangedSignalId = this._settings.connect('changed', Lang.bind(this, function() {
+        this._settingsChangedSignalId = this._settings.connect('changed', () => {
             this.emit('changed');
-                                        }));
+        });
 
         this._load();
     },
@@ -319,10 +319,10 @@ var Background = new Lang.Class({
 
         this.isLoaded = true;
 
-        let id = GLib.idle_add(GLib.PRIORITY_DEFAULT, Lang.bind(this, function() {
+        let id = GLib.idle_add(GLib.PRIORITY_DEFAULT, () => {
             this.emit('loaded');
             return GLib.SOURCE_REMOVE;
-        }));
+        });
         GLib.Source.set_name_by_id(id, '[gnome-shell] this.emit');
     },
 
@@ -349,13 +349,13 @@ var Background = new Lang.Class({
 
         this._cache.monitorFile(file);
         let signalId = this._cache.connect('file-changed',
-                                           Lang.bind(this, function(cache, changedFile) {
+                                           (cache, changedFile) => {
                                                if (changedFile.equal(file)) {
                                                    let imageCache = Meta.BackgroundImageCache.get_default();
                                                    imageCache.purge(changedFile);
                                                    this.emit('changed');
                                                }
-                                           }));
+                                           });
         this._fileWatches[key] = signalId;
     },
 
@@ -372,7 +372,7 @@ var Background = new Lang.Class({
         this._animation.update(this._layoutManager.monitors[this._monitorIndex]);
         let files = this._animation.keyFrameFiles;
 
-        let finish = Lang.bind(this, function() {
+        let finish = () => {
             this._setLoaded();
             if (files.length > 1) {
                 this.background.set_blend(files[0], files[1],
@@ -384,7 +384,7 @@ var Background = new Lang.Class({
                 this.background.set_file(null, this._style);
             }
             this._queueUpdateAnimation();
-        });
+        };
 
         let cache = Meta.BackgroundImageCache.get_default();
         let numPendingImages = files.length;
@@ -396,13 +396,12 @@ var Background = new Lang.Class({
                 if (numPendingImages == 0)
                     finish();
             } else {
-                let id = image.connect('loaded',
-                                       Lang.bind(this, function() {
+                let id = image.connect('loaded', () => {
                     image.disconnect(id);
                     numPendingImages--;
                     if (numPendingImages == 0)
                         finish();
-                                       }));
+                });
             }
         }
     },
@@ -428,18 +427,18 @@ var Background = new Lang.Class({
 
         this._updateAnimationTimeoutId = GLib.timeout_add(GLib.PRIORITY_DEFAULT,
                                                       interval,
-                                                      Lang.bind(this, function() {
+                                                      () => {
                                                           this._updateAnimationTimeoutId = 0;
                                                           this._updateAnimation();
                                                           return GLib.SOURCE_REMOVE;
-                                                                }));
+                                                      });
         GLib.Source.set_name_by_id(this._updateAnimationTimeoutId, '[gnome-shell] this._updateAnimation');
     },
 
     _loadAnimation(file) {
         this._cache.getAnimation({ file: file,
                                    settingsSchema: this._settings.schema_id,
-                                   onLoaded: Lang.bind(this, function(animation) {
+                                   onLoaded: animation => {
                                        this._animation = animation;
 
                                        if (!this._animation || this._cancellable.is_cancelled()) {
@@ -449,7 +448,7 @@ var Background = new Lang.Class({
 
                                        this._updateAnimation();
                                        this._watchFile(file);
-                                   })
+                                   }
                                  });
     },
 
@@ -462,11 +461,10 @@ var Background = new Lang.Class({
         if (image.is_loaded())
             this._setLoaded();
         else {
-            let id = image.connect('loaded',
-                                   Lang.bind(this, function() {
+            let id = image.connect('loaded', () => {
                 this._setLoaded();
                 image.disconnect(id);
-                                   }));
+            });
         }
     },
 
@@ -514,18 +512,17 @@ var SystemBackground = new Lang.Class({
         let image = cache.load(file);
         if (image.is_loaded()) {
             image = null;
-            let id = GLib.idle_add(GLib.PRIORITY_DEFAULT, Lang.bind(this, function() {
+            let id = GLib.idle_add(GLib.PRIORITY_DEFAULT, () => {
                 this.emit('loaded');
                 return GLib.SOURCE_REMOVE;
-            }));
+            });
             GLib.Source.set_name_by_id(id, '[gnome-shell] SystemBackground.loaded');
         } else {
-            let id = image.connect('loaded',
-                                   Lang.bind(this, function() {
+            let id = image.connect('loaded', () => {
                 this.emit('loaded');
                 image.disconnect(id);
                 image = null;
-                                   }));
+            });
         }
     },
 });
@@ -594,11 +591,11 @@ var BackgroundSource = new Lang.Class({
                 style: style
             });
 
-            background._changedId = background.connect('changed', Lang.bind(this, function() {
+            background._changedId = background.connect('changed', () => {
                 background.disconnect(background._changedId);
                 background.destroy();
                 delete this._backgrounds[monitorIndex];
-            }));
+            });
 
             this._backgrounds[monitorIndex] = background;
         }
@@ -635,13 +632,11 @@ var Animation = new Lang.Class({
     load(callback) {
         this._show = new GnomeDesktop.BGSlideShow({ filename: this.file.get_path() });
 
-        this._show.load_async(null,
-                              Lang.bind(this,
-                                        function(object, result) {
+        this._show.load_async(null, (object, result) => {
             this.loaded = true;
             if (callback)
                 callback();
-                                        }));
+        });
     },
 
     update(monitor) {
@@ -745,13 +740,12 @@ var BackgroundManager = new Lang.Class({
             this._swapBackgroundActor();
         } else {
             newBackgroundActor.loadedSignalId = background.connect('loaded',
-                Lang.bind(this, function() {
+                () => {
                     background.disconnect(newBackgroundActor.loadedSignalId);
                     newBackgroundActor.loadedSignalId = 0;
 
                     this._swapBackgroundActor();
-
-                }));
+                });
         }
     },
 
@@ -775,19 +769,19 @@ var BackgroundManager = new Lang.Class({
             backgroundActor.lower_bottom();
         }
 
-        let changeSignalId = background.connect('changed', Lang.bind(this, function() {
+        let changeSignalId = background.connect('changed', () => {
             background.disconnect(changeSignalId);
             changeSignalId = null;
             this._updateBackgroundActor();
-        }));
+        });
 
-        backgroundActor.connect('destroy', Lang.bind(this, function() {
+        backgroundActor.connect('destroy', () => {
             if (changeSignalId)
                 background.disconnect(changeSignalId);
 
             if (backgroundActor.loadedSignalId)
                 background.disconnect(backgroundActor.loadedSignalId);
-        }));
+        });
 
         return backgroundActor;
     },

js/ui/backgroundMenu.js

@@ -40,7 +40,7 @@ function addBackgroundMenu(actor, layoutManager) {
     }
 
     let clickAction = new Clutter.ClickAction();
-    clickAction.connect('long-press', function(action, actor, state) {
+    clickAction.connect('long-press', (action, actor, state) => {
         if (state == Clutter.LongPressState.QUERY)
             return ((action.get_button() == 0 ||
                      action.get_button() == 1) &&
@@ -52,7 +52,7 @@ function addBackgroundMenu(actor, layoutManager) {
         }
         return true;
     });
-    clickAction.connect('clicked', function(action) {
+    clickAction.connect('clicked', action => {
         if (action.get_button() == 3) {
             let [x, y] = action.get_coords();
             openMenu(x, y);
@@ -60,11 +60,11 @@ function addBackgroundMenu(actor, layoutManager) {
     });
     actor.add_action(clickAction);
 
-    let grabOpBeginId = global.display.connect('grab-op-begin', function () {
+    let grabOpBeginId = global.display.connect('grab-op-begin', () => {
         clickAction.release();
     });
 
-    actor.connect('destroy', function() {
+    actor.connect('destroy', () => {
         actor._backgroundMenu.destroy();
         actor._backgroundMenu = null;
         actor._backgroundManager = null;

js/ui/boxpointer.js

@@ -69,7 +69,7 @@ var BoxPointer = new Lang.Class({
     _muteInput() {
         if (this._capturedEventId == 0)
             this._capturedEventId = this.actor.connect('captured-event',
-                                                       function() { return Clutter.EVENT_STOP; });
+                                                       () => Clutter.EVENT_STOP);
     },
 
     _unmuteInput() {
@@ -112,11 +112,11 @@ var BoxPointer = new Lang.Class({
                                  xOffset: 0,
                                  yOffset: 0,
                                  transition: 'linear',
-                                 onComplete: Lang.bind(this, function() {
+                                 onComplete: () => {
                                      this._unmuteInput();
                                      if (onComplete)
                                          onComplete();
-                                 }),
+                                 },
                                  time: animationTime });
     },
 
@@ -156,14 +156,14 @@ var BoxPointer = new Lang.Class({
                                  yOffset: yOffset,
                                  transition: 'linear',
                                  time: animationTime,
-                                 onComplete: Lang.bind(this, function () {
+                                 onComplete: () => {
                                      this.actor.hide();
                                      this.opacity = 0;
                                      this.xOffset = 0;
                                      this.yOffset = 0;
                                      if (onComplete)
                                          onComplete();
-                                 })
+                                 }
                                });
     },
 
@@ -623,10 +623,10 @@ var BoxPointer = new Lang.Class({
         if (this._arrowSide != arrowSide) {
             this._arrowSide = arrowSide;
             this._reposition();
-            Meta.later_add(Meta.LaterType.BEFORE_REDRAW, Lang.bind(this, function() {
+            Meta.later_add(Meta.LaterType.BEFORE_REDRAW, () => {
                 this._container.queue_relayout();
                 return false;
-            }));
+            });
 
             this.emit('arrow-side-changed');
         }

js/ui/calendar.js

@@ -21,7 +21,7 @@ var ELLIPSIS_CHAR = '\u2026';
 
 var MESSAGE_ICON_SIZE = -1; // pick up from CSS
 
-var NC_ = function(context, str) { return context + '\u0004' + str; };
+var NC_ = (context, str) => context + '\u0004' + str;
 
 function sameYear(dateA, dateB) {
     return (dateA.getYear() == dateB.getYear());
@@ -188,14 +188,13 @@ var DBusEventSource = new Lang.Class({
 
         let savedState = global.get_persistent_state('as', 'ignored_events');
         if (savedState)
-            savedState.deep_unpack().forEach(Lang.bind(this,
-                function(eventId) {
+            savedState.deep_unpack().forEach(eventId => {
                 this._ignoredEvents.set(eventId, true);
-                }));
+            });
 
         this._initialized = false;
         this._dbusProxy = new CalendarServer();
-        this._dbusProxy.init_async(GLib.PRIORITY_DEFAULT, null, Lang.bind(this, function(object, result) {
+        this._dbusProxy.init_async(GLib.PRIORITY_DEFAULT, null, (object, result) => {
             let loaded = false;
 
             try {
@@ -218,23 +217,23 @@ var DBusEventSource = new Lang.Class({
 
             this._dbusProxy.connectSignal('Changed', Lang.bind(this, this._onChanged));
 
-            this._dbusProxy.connect('notify::g-name-owner', Lang.bind(this, function() {
+            this._dbusProxy.connect('notify::g-name-owner', () => {
                 if (this._dbusProxy.g_name_owner)
                     this._onNameAppeared();
                 else
                     this._onNameVanished();
-            }));
+            });
 
-            this._dbusProxy.connect('g-properties-changed', Lang.bind(this, function() {
+            this._dbusProxy.connect('g-properties-changed', () => {
                 this.emit('notify::has-calendars');
-            }));
+            });
 
             this._initialized = loaded;
             if (loaded) {
                 this.emit('notify::has-calendars');
                 this._onNameAppeared();
             }
-        }));
+        });
     },
 
     destroy() {
@@ -283,9 +282,7 @@ var DBusEventSource = new Lang.Class({
                 let event = new CalendarEvent(id, date, end, summary, allDay);
                 newEvents.push(event);
             }
-            newEvents.sort(function(event1, event2) {
-                return event1.date.getTime() - event2.date.getTime();
-            });
+            newEvents.sort((ev1, ev2) => ev1.date.getTime() - ev2.date.getTime());
         }
 
         this._events = newEvents;
@@ -340,7 +337,7 @@ var DBusEventSource = new Lang.Class({
                 result.push(event);
             }
         }
-        result.sort(function(event1, event2) {
+        result.sort((event1, event2) => {
             // sort events by end time on ending day
             let d1 = event1.date < begin && event1.end <= end ? event1.end : event1.date;
             let d2 = event2.date < begin && event2.end <= end ? event2.end : event2.date;
@@ -410,10 +407,10 @@ var Calendar = new Lang.Class({
     // requestRange(), getEvents(), hasEvents() methods and the ::changed signal.
     setEventSource(eventSource) {
         this._eventSource = eventSource;
-        this._eventSource.connect('changed', Lang.bind(this, function() {
+        this._eventSource.connect('changed', () => {
             this._rebuildCalendar();
             this._update();
-        }));
+        });
         this._rebuildCalendar();
         this._update();
     },
@@ -617,11 +614,11 @@ var Calendar = new Lang.Class({
                 button.reactive = false;
 
             button._date = new Date(iter);
-            button.connect('clicked', Lang.bind(this, function() {
+            button.connect('clicked', () => {
                 this._shouldDateGrabFocus = true;
                 this.setDate(button._date);
                 this._shouldDateGrabFocus = false;
-            }));
+            });
 
             let hasEvents = this._eventSource.hasEvents(iter);
             let styleClass = 'calendar-day-base calendar-day';
@@ -691,7 +688,7 @@ var Calendar = new Lang.Class({
         if (!this._calendarBegin || !sameMonth(this._selectedDate, this._calendarBegin) || !sameDay(now, this._markedAsToday))
             this._rebuildCalendar();
 
-        this._buttons.forEach(Lang.bind(this, function(button) {
+        this._buttons.forEach(button => {
             if (sameDay(button._date, this._selectedDate)) {
                 button.add_style_pseudo_class('selected');
                 if (this._shouldDateGrabFocus)
@@ -699,7 +696,7 @@ var Calendar = new Lang.Class({
             }
             else
                 button.remove_style_pseudo_class('selected');
-        }));
+        });
     }
 });
 Signals.addSignalMethods(Calendar.prototype);
@@ -773,16 +770,14 @@ var NotificationMessage = new Lang.Class({
 
         this.setIcon(this._getIcon());
 
-        this.connect('close', Lang.bind(this,
-            function() {
+        this.connect('close', () => {
             this._closed = true;
             this.notification.destroy(MessageTray.NotificationDestroyedReason.DISMISSED);
-            }));
-        this._destroyId = notification.connect('destroy', Lang.bind(this,
-            function() {
+        });
+        this._destroyId = notification.connect('destroy', () => {
             if (!this._closed)
                 this.close();
-            }));
+        });
         this._updatedId = notification.connect('updated',
                                                Lang.bind(this, this._onUpdated));
     },
@@ -890,9 +885,9 @@ var EventsSection = new Lang.Class({
             let event = events[i];
 
             let message = new EventMessage(event, this._date);
-            message.connect('close', Lang.bind(this, function() {
+            message.connect('close', () => {
                 this._ignoreEvent(event);
-            }));
+            });
             this.addMessage(message, false);
         }
 
@@ -912,7 +907,7 @@ var EventsSection = new Lang.Class({
         let apps = Gio.AppInfo.get_recommended_for_type('text/calendar');
         if (apps && (apps.length > 0)) {
             let app = Gio.AppInfo.get_default_for_type('text/calendar', false);
-            let defaultInRecommended = apps.some(function(a) { return a.equal(app); });
+            let defaultInRecommended = apps.some(a => a.equal(app));
             this._calendarApp = defaultInRecommended ? app : apps[0];
         } else {
             this._calendarApp = null;
@@ -959,9 +954,9 @@ var NotificationSection = new Lang.Class({
         this._nUrgent = 0;
 
         Main.messageTray.connect('source-added', Lang.bind(this, this._sourceAdded));
-        Main.messageTray.getSources().forEach(Lang.bind(this, function(source) {
+        Main.messageTray.getSources().forEach(source => {
             this._sourceAdded(Main.messageTray, source);
-        }));
+        });
 
         this.actor.connect('notify::mapped', Lang.bind(this, this._onMapped));
     },
@@ -988,9 +983,9 @@ var NotificationSection = new Lang.Class({
             notificationAddedId: 0,
         };
 
-        obj.destroyId = source.connect('destroy', Lang.bind(this, function(source) {
+        obj.destroyId = source.connect('destroy', source => {
             this._onSourceDestroy(source, obj);
-        }));
+        });
         obj.notificationAddedId = source.connect('notification-added',
                                                  Lang.bind(this, this._onNotificationAdded));
 
@@ -1003,18 +998,16 @@ var NotificationSection = new Lang.Class({
 
         let isUrgent = notification.urgency == MessageTray.Urgency.CRITICAL;
 
-        let updatedId = notification.connect('updated', Lang.bind(this,
-            function() {
+        let updatedId = notification.connect('updated', () => {
             message.setSecondaryActor(this._createTimeLabel(notification.datetime));
             this.moveMessage(message, isUrgent ? 0 : this._nUrgent, this.actor.mapped);
-            }));
-        let destroyId = notification.connect('destroy', Lang.bind(this,
-            function() {
+        });
+        let destroyId = notification.connect('destroy', () => {
             notification.disconnect(destroyId);
             notification.disconnect(updatedId);
             if (isUrgent)
                 this._nUrgent--;
-            }));
+        });
 
         if (isUrgent) {
             // Keep track of urgent notifications to keep them on top
@@ -1157,10 +1150,9 @@ var CalendarMessageList = new Lang.Class({
             canClearChangedId: 0,
             keyFocusId: 0
         };
-        obj.destroyId = section.actor.connect('destroy', Lang.bind(this,
-            function() {
+        obj.destroyId = section.actor.connect('destroy', () => {
             this._removeSection(section);
-            }));
+        });
         obj.visibleId = section.actor.connect('notify::visible',
                                               Lang.bind(this, this._sync));
         obj.emptyChangedId = section.connect('empty-changed',
@@ -1194,22 +1186,16 @@ var CalendarMessageList = new Lang.Class({
 
     _sync() {
         let sections = [...this._sections.keys()];
-        let visible = sections.some(function(s) {
-            return s.allowed;
-        });
+        let visible = sections.some(s => s.allowed);
         this.actor.visible = visible;
         if (!visible)
             return;
 
-        let empty = sections.every(function(s) {
-            return s.empty || !s.actor.visible;
-        });
+        let empty = sections.every(s => s.empty || !s.actor.visible);
         this._placeholder.actor.visible = empty;
         this._clearButton.visible = !empty;
 
-        let canClear = sections.some(function(s) {
-            return s.canClear && s.actor.visible;
-        });
+        let canClear = sections.some(s => s.canClear && s.actor.visible);
         this._clearButton.reactive = canClear;
     },
 

js/ui/closeDialog.js

@@ -107,9 +107,9 @@ var CloseDialog = new Lang.Class({
                          { scale_y: 1,
                            transition: 'linear',
                            time: DIALOG_TRANSITION_TIME,
-                           onComplete: Lang.bind(this, function () {
+                           onComplete: () => {
                                Main.layoutManager.trackChrome(this._dialog, { affectsInputRegion: true });
-                           })
+                           }
                          });
     },
 
@@ -125,9 +125,9 @@ var CloseDialog = new Lang.Class({
                          { scale_y: 0,
                            transition: 'linear',
                            time: DIALOG_TRANSITION_TIME,
-                           onComplete: Lang.bind(this, function () {
+                           onComplete: () => {
                                dialog.destroy();
-                           })
+                           }
                          });
     },
 

js/ui/components/__init__.js

@@ -16,17 +16,17 @@ var ComponentManager = new Lang.Class({
     _sessionUpdated() {
         let newEnabledComponents = Main.sessionMode.components;
 
-        newEnabledComponents.filter(Lang.bind(this, function(name) {
-            return this._enabledComponents.indexOf(name) == -1;
-        })).forEach(Lang.bind(this, function(name) {
+        newEnabledComponents.filter(
+            name => this._enabledComponents.indexOf(name) == -1
+        ).forEach(name => {
             this._enableComponent(name);
-        }));
+        });
 
-        this._enabledComponents.filter(Lang.bind(this, function(name) {
-            return newEnabledComponents.indexOf(name) == -1;
-        })).forEach(Lang.bind(this, function(name) {
+        this._enabledComponents.filter(
+            name => newEnabledComponents.indexOf(name) == -1
+        ).forEach(name => {
             this._disableComponent(name);
-        }));
+        });
 
         this._enabledComponents = newEnabledComponents;
     },

js/ui/components/automountManager.js

@@ -61,21 +61,20 @@ var AutomountManager = new Lang.Class({
 
     _InhibitorsChanged(object, senderName, [inhibtor]) {
         this._session.IsInhibitedRemote(GNOME_SESSION_AUTOMOUNT_INHIBIT,
-            Lang.bind(this,
-                function(result, error) {
+            (result, error) => {
                 if (!error) {
                     this._inhibited = result[0];
                 }
-                }));
+            });
     },
 
     _startupMountAll() {
         let volumes = this._volumeMonitor.get_volumes();
-        volumes.forEach(Lang.bind(this, function(volume) {
+        volumes.forEach(volume => {
             this._checkAndMountVolume(volume, { checkSession: false,
                                                 useMountOp: false,
                                                 allowAutorun: false });
-        }));
+        });
 
         this._mountAllId = 0;
         return GLib.SOURCE_REMOVE;
@@ -114,23 +113,23 @@ var AutomountManager = new Lang.Class({
         if (drive.can_stop()) {
             drive.stop
                 (Gio.MountUnmountFlags.FORCE, null, null,
-                 Lang.bind(this, function(drive, res) {
+                 (drive, res) => {
                      try {
                          drive.stop_finish(res);
                      } catch (e) {
                          log("Unable to stop the drive after drive-eject-button " + e.toString());
                      }
-                 }));
+                 });
         } else if (drive.can_eject()) {
             drive.eject_with_operation 
                 (Gio.MountUnmountFlags.FORCE, null, null,
-                 Lang.bind(this, function(drive, res) {
+                 (drive, res) => {
                      try {
                          drive.eject_with_operation_finish(res);
                      } catch (e) {
                          log("Unable to eject the drive after drive-eject-button " + e.toString());
                      }
-                 }));
+                 });
         }
     },
 
@@ -212,9 +211,7 @@ var AutomountManager = new Lang.Class({
 
     _onVolumeRemoved(monitor, volume) {
         this._volumeQueue = 
-            this._volumeQueue.filter(function(element) {
-                return (element != volume);
-            });
+            this._volumeQueue.filter(element => (element != volume));
     },
 
     _reaskPassword(volume) {
@@ -235,7 +232,7 @@ var AutomountManager = new Lang.Class({
     },
 
     _allowAutorunExpire(volume) {
-        let id = Mainloop.timeout_add_seconds(AUTORUN_EXPIRE_TIMEOUT_SECS, function() {
+        let id = Mainloop.timeout_add_seconds(AUTORUN_EXPIRE_TIMEOUT_SECS, () => {
             volume.allowAutorun = false;
             return GLib.SOURCE_REMOVE;
         });

js/ui/components/autorunManager.js

@@ -129,9 +129,9 @@ var ContentTypeDiscoverer = new Lang.Class({
 
             let hotplugSniffer = new HotplugSniffer();
             hotplugSniffer.SniffURIRemote(root.get_uri(),
-                 Lang.bind(this, function([contentTypes]) {
+                 ([contentTypes]) => {
                      this._emitCallback(mount, contentTypes);
-                 }));
+                 });
         }
     },
 
@@ -140,12 +140,12 @@ var ContentTypeDiscoverer = new Lang.Class({
             contentTypes = [];
 
         // we're not interested in win32 software content types here
-        contentTypes = contentTypes.filter(function(type) {
-            return (type != 'x-content/win32-software');
-        });
+        contentTypes = contentTypes.filter(
+            type => (type != 'x-content/win32-software')
+        );
 
         let apps = [];
-        contentTypes.forEach(function(type) {
+        contentTypes.forEach(type => {
             let app = Gio.app_info_get_default_for_type(type, false);
 
             if (app)
@@ -185,9 +185,9 @@ var AutorunManager = new Lang.Class({
         if (!this._session.SessionIsActive)
             return;
 
-        let discoverer = new ContentTypeDiscoverer(Lang.bind(this, function(mount, apps, contentTypes) {
+        let discoverer = new ContentTypeDiscoverer((mount, apps, contentTypes) => {
             this._dispatcher.addMount(mount, apps, contentTypes);
-        }));
+        });
         discoverer.guessContentTypes(mount);
     },
 
@@ -222,10 +222,7 @@ var AutorunDispatcher = new Lang.Class({
     },
 
     _getSourceForMount(mount) {
-        let filtered =
-            this._sources.filter(function (source) {
-                return (source.mount == mount);
-            });
+        let filtered = this._sources.filter(source => (source.mount == mount));
 
         // we always make sure not to add two sources for the same
         // mount in addMount(), so it's safe to assume filtered.length
@@ -337,12 +334,12 @@ var AutorunNotification = new Lang.Class({
     createBanner() {
         let banner = new MessageTray.NotificationBanner(this);
 
-        this.source.apps.forEach(Lang.bind(this, function (app) {
+        this.source.apps.forEach(app => {
             let actor = this._buttonForApp(app);
 
             if (actor)
                 banner.addButton(actor);
-        }));
+        });
 
         return banner;
     },
@@ -366,10 +363,10 @@ var AutorunNotification = new Lang.Class({
                                      button_mask: St.ButtonMask.ONE,
                                      style_class: 'hotplug-notification-item button' });
 
-        button.connect('clicked', Lang.bind(this, function() {
+        button.connect('clicked', () => {
             startAppForMount(app, this._mount);
             this.destroy();
-        }));
+        });
 
         return button;
     },

js/ui/components/keyring.js

@@ -279,13 +279,12 @@ var KeyringPrompter = new Lang.Class({
 
     _init() {
         this._prompter = new Gcr.SystemPrompter();
-        this._prompter.connect('new-prompt', Lang.bind(this,
-            function() {
+        this._prompter.connect('new-prompt', () => {
             let dialog = this._enabled ? new KeyringDialog()
                                        : new KeyringDummyDialog();
             this._currentPrompt = dialog.prompt;
             return this._currentPrompt;
-            }));
+        });
         this._dbusId = null;
         this._registered = false;
         this._enabled = false;

js/ui/components/networkAgent.js

@@ -83,14 +83,14 @@ var NetworkSecretDialog = new Lang.Class({
                 }
 
                 secret.entry.clutter_text.connect('activate', Lang.bind(this, this._onOk));
-                secret.entry.clutter_text.connect('text-changed', Lang.bind(this, function() {
+                secret.entry.clutter_text.connect('text-changed', () => {
                     secret.value = secret.entry.get_text();
                     if (secret.validate)
                         secret.valid = secret.validate(secret);
                     else
                         secret.valid = secret.value.length > 0;
                     this._updateOkButton();
-                }));
+                });
             } else
                 secret.valid = true;
 
@@ -464,7 +464,7 @@ var VPNRequestHandler = new Lang.Class({
     },
 
     _readStdoutOldStyle() {
-        this._dataStdout.read_line_async(GLib.PRIORITY_DEFAULT, null, Lang.bind(this, function(stream, result) {
+        this._dataStdout.read_line_async(GLib.PRIORITY_DEFAULT, null, (stream, result) => {
             let [line, len] = this._dataStdout.read_line_finish_utf8(result);
 
             if (line == null) {
@@ -477,11 +477,11 @@ var VPNRequestHandler = new Lang.Class({
 
             // try to read more!
             this._readStdoutOldStyle();
-        }));
+        });
     },
 
     _readStdoutNewStyle() {
-        this._dataStdout.fill_async(-1, GLib.PRIORITY_DEFAULT, null, Lang.bind(this, function(stream, result) {
+        this._dataStdout.fill_async(-1, GLib.PRIORITY_DEFAULT, null, (stream, result) => {
             let cnt = this._dataStdout.fill_finish(result);
 
             if (cnt == 0) {
@@ -495,7 +495,7 @@ var VPNRequestHandler = new Lang.Class({
             // Try to read more
             this._dataStdout.set_buffer_size(2 * this._dataStdout.get_buffer_size());
             this._readStdoutNewStyle();
-        }));
+        });
     },
 
     _showNewStyleDialog() {
@@ -562,14 +562,14 @@ var VPNRequestHandler = new Lang.Class({
         let vpnSetting = this._connection.get_setting_vpn();
 
         try {
-            vpnSetting.foreach_data_item(Lang.bind(this, function(key, value) {
+            vpnSetting.foreach_data_item((key, value) => {
                 this._stdin.write('DATA_KEY=' + key + '\n', null);
                 this._stdin.write('DATA_VAL=' + (value || '') + '\n\n', null);
-            }));
-            vpnSetting.foreach_secret(Lang.bind(this, function(key, value) {
+            });
+            vpnSetting.foreach_secret((key, value) => {
                 this._stdin.write('SECRET_KEY=' + key + '\n', null);
                 this._stdin.write('SECRET_VAL=' + (value || '') + '\n\n', null);
-            }));
+            });
             this._stdin.write('DONE\n\n', null);
         } catch(e) {
             logError(e, 'internal error while writing connection to helper');
@@ -688,17 +688,17 @@ var NetworkAgent = new Lang.Class({
 
         let notification = new MessageTray.Notification(source, title, body);
 
-        notification.connect('activated', Lang.bind(this, function() {
+        notification.connect('activated', () => {
             notification.answered = true;
             this._handleRequest(requestId, connection, settingName, hints, flags);
-        }));
+        });
 
         this._notifications[requestId] = notification;
-        notification.connect('destroy', Lang.bind(this, function() {
+        notification.connect('destroy', () => {
             if (!notification.answered)
                 this._native.respond(requestId, Shell.NetworkAgentResponse.USER_CANCELED);
             delete this._notifications[requestId];
-        }));
+        });
 
         Main.messageTray.add(source);
         source.notify(notification);
@@ -718,9 +718,9 @@ var NetworkAgent = new Lang.Class({
         }
 
         let dialog = new NetworkSecretDialog(this._native, requestId, connection, settingName, hints);
-        dialog.connect('destroy', Lang.bind(this, function() {
+        dialog.connect('destroy', () => {
             delete this._dialogs[requestId];
-        }));
+        });
         this._dialogs[requestId] = dialog;
         dialog.open(global.get_current_time());
     },
@@ -752,9 +752,9 @@ var NetworkAgent = new Lang.Class({
         }
 
         let vpnRequest = new VPNRequestHandler(this._native, requestId, binary, serviceType, connection, hints, flags);
-        vpnRequest.connect('destroy', Lang.bind(this, function() {
+        vpnRequest.connect('destroy', () => {
             delete this._vpnRequests[requestId];
-        }));
+        });
         this._vpnRequests[requestId] = vpnRequest;
     },
 

js/ui/components/telepathyClient.js

@@ -47,7 +47,7 @@ var NotificationDirection = {
     RECEIVED: 'chat-received'
 };
 
-var N_ = function(s) { return s; };
+var N_ = s => s;
 
 function makeMessageFromTpMessage(tpMessage, direction) {
     let [text, flags] = tpMessage.to_text();
@@ -188,10 +188,9 @@ var TelepathyClient = HAVE_TP ? new Lang.Class({
         let source = new ChatSource(account, conn, channel, contact, this);
 
         this._chatSources[channel.get_object_path()] = source;
-        source.connect('destroy', Lang.bind(this,
-                       function() {
+        source.connect('destroy', () => {
             delete this._chatSources[channel.get_object_path()];
-                       }));
+        });
     },
 
     vfunc_handle_channels(account, conn, channels, requests,
@@ -262,14 +261,14 @@ var TelepathyClient = HAVE_TP ? new Lang.Class({
         }
 
         // Approve private text channels right away as we are going to handle it
-        dispatchOp.claim_with_async(this, Lang.bind(this, function(dispatchOp, result) {
+        dispatchOp.claim_with_async(this, (dispatchOp, result) => {
             try {
                 dispatchOp.claim_with_finish(result);
                 this._handlingChannels(account, conn, [channel], false);
             } catch (err) {
                 log('Failed to Claim channel: ' + err);
             }
-        }));
+        });
 
         context.accept();
     },
@@ -322,15 +321,13 @@ var ChatSource = new Lang.Class({
 
         this._notification = new ChatNotification(this);
         this._notification.connect('activated', Lang.bind(this, this.open));
-        this._notification.connect('updated', Lang.bind(this,
-            function() {
+        this._notification.connect('updated', () => {
             if (this._banner && this._banner.expanded)
                 this._ackMessages();
-            }));
-        this._notification.connect('destroy', Lang.bind(this,
-            function() {
+        });
+        this._notification.connect('destroy', () => {
             this._notification = null;
-            }));
+        });
         this.pushNotification(this._notification);
     },
 
@@ -345,11 +342,10 @@ var ChatSource = new Lang.Class({
 
         // We ack messages when the user expands the new notification
         let id = this._banner.connect('expanded', Lang.bind(this, this._ackMessages));
-        this._banner.actor.connect('destroy', Lang.bind(this,
-            function() {
+        this._banner.actor.connect('destroy', () => {
             this._banner.disconnect(id);
             this._banner = null;
-            }));
+        });
 
         return this._banner;
     },
@@ -504,7 +500,7 @@ var ChatSource = new Lang.Class({
             this._ackMessages();
             // The chat box has been destroyed so it can't
             // handle the channel any more.
-            this._channel.close_async(function(channel, result) {
+            this._channel.close_async((channel, result) => {
                 channel.close_finish(result);
             });
         } else {
@@ -602,9 +598,9 @@ var ChatSource = new Lang.Class({
         }
 
         let msg = Tp.ClientMessage.new_text(type, text);
-        this._channel.send_message_async(msg, 0, Lang.bind(this, function (src, result) {
+        this._channel.send_message_async(msg, 0, (src, result) => {
             this._channel.send_message_finish(result); 
-        }));
+        });
     },
 
     setChatState(state) {
@@ -722,7 +718,7 @@ var ChatNotification = new Lang.Class({
         let maxLength = (lastMessageTime < currentTime - SCROLLBACK_RECENT_TIME) ?
             SCROLLBACK_IDLE_LENGTH : SCROLLBACK_RECENT_LENGTH;
 
-        let filteredHistory = this.messages.filter(function(item) { return item.realMessage });
+        let filteredHistory = this.messages.filter(item => item.realMessage);
         if (filteredHistory.length > maxLength) {
             let lastMessageToKeep = filteredHistory[maxLength];
             let expired = this.messages.splice(this.messages.indexOf(lastMessageToKeep));
@@ -830,13 +826,13 @@ var ChatNotificationBanner = new Lang.Class({
         this._responseEntry.clutter_text.connect('text-changed', Lang.bind(this, this._onEntryChanged));
         this.setActionArea(this._responseEntry);
 
-        this._responseEntry.clutter_text.connect('key-focus-in', Lang.bind(this, function() {
+        this._responseEntry.clutter_text.connect('key-focus-in', () => {
             this.focused = true;
-        }));
-        this._responseEntry.clutter_text.connect('key-focus-out', Lang.bind(this, function() {
+        });
+        this._responseEntry.clutter_text.connect('key-focus-out', () => {
             this.focused = false;
             this.emit('unfocused');
-        }));
+        });
 
         this._scrollArea = new St.ScrollView({ style_class: 'chat-scrollview vfade',
                                                vscrollbar_policy: Gtk.PolicyType.AUTOMATIC,
@@ -855,11 +851,11 @@ var ChatNotificationBanner = new Lang.Class({
         // force a scroll to the bottom if things change while we were at the
         // bottom
         this._oldMaxScrollValue = this._scrollArea.vscroll.adjustment.value;
-        this._scrollArea.vscroll.adjustment.connect('changed', Lang.bind(this, function(adjustment) {
+        this._scrollArea.vscroll.adjustment.connect('changed', adjustment => {
             if (adjustment.value == this._oldMaxScrollValue)
                 this.scrollTo(St.Side.BOTTOM);
             this._oldMaxScrollValue = Math.max(adjustment.lower, adjustment.upper - adjustment.page_size);
-        }));
+        });
 
         this._inputHistory = new History.HistoryManager({ entry: this._responseEntry.clutter_text });
 
@@ -868,19 +864,19 @@ var ChatNotificationBanner = new Lang.Class({
         this._messageActors = new Map();
 
         this._messageAddedId = this.notification.connect('message-added',
-            Lang.bind(this, function(n, message) {
+            (n, message) => {
                 this._addMessage(message);
-            }));
+            });
         this._messageRemovedId = this.notification.connect('message-removed',
-            Lang.bind(this, function(n, message) {
+            (n, message) => {
                 let actor = this._messageActors.get(message);
                 if (this._messageActors.delete(message))
                     actor.destroy();
-            }));
+            });
         this._timestampChangedId = this.notification.connect('timestamp-changed',
-            Lang.bind(this, function(n, message) {
+            (n, message) => {
                 this._updateTimestamp(message);
-            }));
+            });
 
         for (let i = this.notification.messages.length - 1; i >= 0; i--)
             this._addMessage(this.notification.messages[i]);

js/ui/ctrlAltTab.js

@@ -41,7 +41,7 @@ var CtrlAltTabManager = new Lang.Class({
         item.iconName = icon;
 
         this._items.push(item);
-        root.connect('destroy', Lang.bind(this, function() { this.removeGroup(root); }));
+        root.connect('destroy', () => { this.removeGroup(root); });
         if (root instanceof St.Widget)
             global.focus_manager.add_group(root);
     },
@@ -81,7 +81,7 @@ var CtrlAltTabManager = new Lang.Class({
 
     popup(backward, binding, mask) {
         // Start with the set of focus groups that are currently mapped
-        let items = this._items.filter(function (item) { return item.proxy.mapped; });
+        let items = this._items.filter(item => item.proxy.mapped);
 
         // And add the windows metacity would show in its Ctrl-Alt-Tab list
         if (Main.sessionMode.hasWindows && !Main.overview.visible) {
@@ -125,9 +125,9 @@ var CtrlAltTabManager = new Lang.Class({
             this._popup.show(backward, binding, mask);
 
             this._popup.actor.connect('destroy',
-                                      Lang.bind(this, function() {
+                                      () => {
                                           this._popup = null;
-                                      }));
+                                      });
         }
     },
 

js/ui/dash.js

@@ -148,9 +148,9 @@ var DashItemContainer = new Lang.Class({
                          { opacity: 0,
                            time: DASH_ITEM_LABEL_HIDE_TIME,
                            transition: 'easeOutQuad',
-                           onComplete: Lang.bind(this, function() {
+                           onComplete: () => {
                                this.label.hide();
-                           })
+                           }
                          });
     },
 
@@ -195,9 +195,9 @@ var DashItemContainer = new Lang.Class({
                            childOpacity: 0,
                            time: DASH_ANIMATION_TIME,
                            transition: 'easeOutQuad',
-                           onComplete: Lang.bind(this, function() {
+                           onComplete: () => {
                                this.destroy();
-                           })
+                           }
                          });
     },
 
@@ -301,11 +301,10 @@ var ShowAppsIcon = new Lang.Class({
 
         let id = app.get_id();
 
-        Meta.later_add(Meta.LaterType.BEFORE_REDRAW, Lang.bind(this,
-            function () {
+        Meta.later_add(Meta.LaterType.BEFORE_REDRAW, () => {
             AppFavorites.getAppFavorites().removeFavorite(id);
             return false;
-            }));
+        });
 
         return true;
     }
@@ -415,21 +414,20 @@ var Dash = new Lang.Class({
         this._container.add_actor(this._showAppsIcon);
 
         this.actor = new St.Bin({ child: this._container });
-        this.actor.connect('notify::height', Lang.bind(this,
-            function() {
+        this.actor.connect('notify::height', () => {
             if (this._maxHeight != this.actor.height)
                 this._queueRedisplay();
             this._maxHeight = this.actor.height;
-            }));
+        });
 
         this._workId = Main.initializeDeferredWork(this._box, Lang.bind(this, this._redisplay));
 
         this._appSystem = Shell.AppSystem.get_default();
 
-        this._appSystem.connect('installed-changed', Lang.bind(this, function() {
+        this._appSystem.connect('installed-changed', () => {
             AppFavorites.getAppFavorites().reload();
             this._queueRedisplay();
-        }));
+        });
         AppFavorites.getAppFavorites().connect('changed', Lang.bind(this, this._queueRedisplay));
         this._appSystem.connect('app-state-changed', Lang.bind(this, this._queueRedisplay));
 
@@ -509,22 +507,22 @@ var Dash = new Lang.Class({
     },
 
     _hookUpLabel(item, appIcon) {
-        item.child.connect('notify::hover', Lang.bind(this, function() {
+        item.child.connect('notify::hover', () => {
             this._syncLabel(item, appIcon);
-        }));
+        });
 
-        let id = Main.overview.connect('hiding', Lang.bind(this, function() {
+        let id = Main.overview.connect('hiding', () => {
             this._labelShowing = false;
             item.hideLabel();
-        }));
-        item.child.connect('destroy', function() {
+        });
+        item.child.connect('destroy', () => {
             Main.overview.disconnect(id);
         });
 
         if (appIcon) {
-            appIcon.connect('sync-tooltip', Lang.bind(this, function() {
+            appIcon.connect('sync-tooltip', () => {
                 this._syncLabel(item, appIcon);
-            }));
+            });
         }
     },
 
@@ -534,19 +532,19 @@ var Dash = new Lang.Class({
                                                showLabel: false });
         if (appIcon._draggable) {
             appIcon._draggable.connect('drag-begin',
-                                       Lang.bind(this, function() {
+                                       () => {
                                            appIcon.actor.opacity = 50;
-                                       }));
+                                       });
             appIcon._draggable.connect('drag-end',
-                                       Lang.bind(this, function() {
+                                       () => {
                                            appIcon.actor.opacity = 255;
-                                       }));
+                                       });
         }
 
         appIcon.connect('menu-state-changed',
-                        Lang.bind(this, function(appIcon, opened) {
+                        (appIcon, opened) => {
                             this._itemMenuStateChanged(item, opened);
-                        }));
+                        });
 
         let item = new DashItemContainer();
         item.setChild(appIcon.actor);
@@ -582,12 +580,12 @@ var Dash = new Lang.Class({
             if (this._showLabelTimeoutId == 0) {
                 let timeout = this._labelShowing ? 0 : DASH_ITEM_HOVER_TIMEOUT;
                 this._showLabelTimeoutId = Mainloop.timeout_add(timeout,
-                    Lang.bind(this, function() {
+                    () => {
                         this._labelShowing = true;
                         item.showLabel();
                         this._showLabelTimeoutId = 0;
                         return GLib.SOURCE_REMOVE;
-                    }));
+                    });
                 GLib.Source.set_name_by_id(this._showLabelTimeoutId, '[gnome-shell] item.showLabel');
                 if (this._resetHoverTimeoutId > 0) {
                     Mainloop.source_remove(this._resetHoverTimeoutId);
@@ -601,11 +599,11 @@ var Dash = new Lang.Class({
             item.hideLabel();
             if (this._labelShowing) {
                 this._resetHoverTimeoutId = Mainloop.timeout_add(DASH_ITEM_HOVER_TIMEOUT,
-                    Lang.bind(this, function() {
+                    () => {
                         this._labelShowing = false;
                         this._resetHoverTimeoutId = 0;
                         return GLib.SOURCE_REMOVE;
-                    }));
+                    });
                 GLib.Source.set_name_by_id(this._resetHoverTimeoutId, '[gnome-shell] this._labelShowing');
             }
         }
@@ -616,7 +614,7 @@ var Dash = new Lang.Class({
         // icons (i.e. ignoring drag placeholders) and which are not
         // animating out (which means they will be destroyed at the end of
         // the animation)
-        let iconChildren = this._box.get_children().filter(function(actor) {
+        let iconChildren = this._box.get_children().filter(actor => {
             return actor.child &&
                    actor.child._delegate &&
                    actor.child._delegate.icon &&
@@ -655,9 +653,7 @@ var Dash = new Lang.Class({
 
         let availSize = availHeight / iconChildren.length;
 
-        let iconSizes = baseIconSizes.map(function(s) {
-            return s * scaleFactor;
-        });
+        let iconSizes = baseIconSizes.map(s => s * scaleFactor);
 
         let newIconSize = baseIconSizes[0];
         for (let i = 0; i < iconSizes.length; i++) {
@@ -708,15 +704,13 @@ var Dash = new Lang.Class({
 
         let running = this._appSystem.get_running();
 
-        let children = this._box.get_children().filter(function(actor) {
+        let children = this._box.get_children().filter(actor => {
                 return actor.child &&
                        actor.child._delegate &&
                        actor.child._delegate.app;
             });
         // Apps currently in the dash
-        let oldApps = children.map(function(actor) {
-                return actor.child._delegate.app;
-            });
+        let oldApps = children.map(actor => actor.child._delegate.app);
         // Apps supposed to be in the dash
         let newApps = [];
 
@@ -782,7 +776,7 @@ var Dash = new Lang.Class({
             let nextApp = newApps.length > newIndex + 1 ? newApps[newIndex + 1]
                                                         : null;
             let insertHere = nextApp && nextApp == oldApp;
-            let alreadyRemoved = removedActors.reduce(function(result, actor) {
+            let alreadyRemoved = removedActors.reduce((result, actor) => {
                 let removedApp = actor.child._delegate.app;
                 return result || removedApp == newApp;
             }, false);
@@ -838,10 +832,9 @@ var Dash = new Lang.Class({
         if (this._dragPlaceholder) {
             this._animatingPlaceholdersCount++;
             this._dragPlaceholder.animateOutAndDestroy();
-            this._dragPlaceholder.connect('destroy',
-                Lang.bind(this, function() {
+            this._dragPlaceholder.connect('destroy', () => {
                 this._animatingPlaceholdersCount--;
-                }));
+            });
             this._dragPlaceholder = null;
         }
         this._dragPlaceholderPos = -1;
@@ -968,15 +961,14 @@ var Dash = new Lang.Class({
         if (!this._dragPlaceholder)
             return true;
 
-        Meta.later_add(Meta.LaterType.BEFORE_REDRAW, Lang.bind(this,
-            function () {
+        Meta.later_add(Meta.LaterType.BEFORE_REDRAW, () => {
             let appFavorites = AppFavorites.getAppFavorites();
             if (srcIsFavorite)
                 appFavorites.moveFavoriteToPos(id, favPos);
             else
                 appFavorites.addFavoriteAtPos(id, favPos);
             return false;
-            }));
+        });
 
         return true;
     }

js/ui/dateMenu.js

@@ -43,10 +43,9 @@ var TodayButton = new Lang.Class({
                                      can_focus: true,
                                      reactive: false
                                    });
-        this.actor.connect('clicked', Lang.bind(this,
-            function() {
+        this.actor.connect('clicked', () => {
             this._calendar.setDate(new Date(), false);
-            }));
+        });
 
         let hbox = new St.BoxLayout({ vertical: true });
         this.actor.add_actor(hbox);
@@ -59,12 +58,11 @@ var TodayButton = new Lang.Class({
         hbox.add_actor(this._dateLabel);
 
         this._calendar = calendar;
-        this._calendar.connect('selected-date-changed', Lang.bind(this,
-            function(calendar, date) {
+        this._calendar.connect('selected-date-changed', (calendar, date) => {
             // Make the button reactive only if the selected date is not the
             // current date.
             this.actor.reactive = !_isToday(date)
-            }));
+        });
     },
 
     setDate(date) {
@@ -97,13 +95,12 @@ var WorldClocksSection = new Lang.Class({
         this.actor = new St.Button({ style_class: 'world-clocks-button',
                                      x_fill: true,
                                      can_focus: true });
-        this.actor.connect('clicked', Lang.bind(this,
-            function() {
+        this.actor.connect('clicked', () => {
             this._clockAppMon.activateApp();
 
             Main.overview.hide();
             Main.panel.closeCalendar();
-            }));
+        });
 
         let layout = new Clutter.GridLayout({ orientation: Clutter.Orientation.VERTICAL });
         this._grid = new St.Widget({ style_class: 'world-clocks-grid',
@@ -139,7 +136,7 @@ var WorldClocksSection = new Lang.Class({
                 this._locations.push({ location: l });
         }
 
-        this._locations.sort(function(a, b) {
+        this._locations.sort((a, b) => {
             return a.location.get_timezone().get_offset() -
                    b.location.get_timezone().get_offset();
         });
@@ -355,7 +352,7 @@ var MessagesIndicator = new Lang.Class({
         Main.messageTray.connect('queue-changed', Lang.bind(this, this._updateCount));
 
         let sources = Main.messageTray.getSources();
-        sources.forEach(Lang.bind(this, function(source) { this._onSourceAdded(null, source); }));
+        sources.forEach(source => { this._onSourceAdded(null, source); });
     },
 
     _onSourceAdded(tray, source) {
@@ -371,10 +368,7 @@ var MessagesIndicator = new Lang.Class({
 
     _updateCount() {
         let count = 0;
-        this._sources.forEach(Lang.bind(this,
-            function(source) {
-                count += source.unseenCount;
-            }));
+        this._sources.forEach(source => { count += source.unseenCount; });
         count -= Main.messageTray.queueCount;
 
         this.actor.visible = (count > 0);
@@ -500,12 +494,12 @@ var DateMenuButton = new Lang.Class({
 
         this._calendar = new Calendar.Calendar();
         this._calendar.connect('selected-date-changed',
-                               Lang.bind(this, function(calendar, date) {
+                               (calendar, date) => {
                                    layout.frozen = !_isToday(date);
                                    this._messageList.setDate(date);
-                               }));
+                               });
 
-        this.menu.connect('open-state-changed', Lang.bind(this, function(menu, isOpen) {
+        this.menu.connect('open-state-changed', (menu, isOpen) => {
             // Whenever the menu is opened, select today
             if (isOpen) {
                 let now = new Date();
@@ -513,7 +507,7 @@ var DateMenuButton = new Lang.Class({
                 this._date.setDate(now);
                 this._messageList.setDate(now);
             }
-        }));
+        });
 
         // Fill up the first column
         this._messageList = new Calendar.CalendarMessageList();

js/ui/dnd.js

@@ -49,8 +49,7 @@ function _getEventHandlerActor() {
         Main.uiGroup.add_actor(eventHandlerActor);
         // We connect to 'event' rather than 'captured-event' because the capturing phase doesn't happen
         // when you've grabbed the pointer.
-        eventHandlerActor.connect('event',
-                                  function(actor, event) {
+        eventHandlerActor.connect('event', (actor, event) => {
             return currentDraggable._onEvent(actor, event);
         });
     }
@@ -86,13 +85,13 @@ var _Draggable = new Lang.Class({
                                Lang.bind(this, this._onTouchEvent));
         }
 
-        this.actor.connect('destroy', Lang.bind(this, function() {
+        this.actor.connect('destroy', () => {
             this._actorDestroyed = true;
 
             if (this._dragInProgress && this._dragCancellable)
                 this._cancelDrag(global.get_current_time());
             this.disconnectAll();
-        }));
+        });
         this._onEventId = null;
         this._touchSequence = null;
 

js/ui/edgeDragAction.js

@@ -22,9 +22,7 @@ var EdgeDragAction = new Lang.Class({
         this._allowedModes = allowedModes;
         this.set_n_touch_points(1);
 
-        global.display.connect('grab-op-begin', Lang.bind(this, function() {
-            this.cancel();
-        }));
+        global.display.connect('grab-op-begin', () => { this.cancel(); });
     },
 
     _getMonitorRect(x, y) {

js/ui/endSessionDialog.js

@@ -290,14 +290,14 @@ var EndSessionDialog = new Lang.Class({
         this._pkOfflineProxy = new PkOfflineProxy(Gio.DBus.system,
                                                   'org.freedesktop.PackageKit',
                                                   '/org/freedesktop/PackageKit',
-                                                  Lang.bind(this, function(proxy, error) {
+                                                  (proxy, error) => {
                                                       if (error)
                                                           log(error.message);
-                                                  }));
+                                                  });
         this._powerProxy = new UPowerProxy(Gio.DBus.system,
                                            'org.freedesktop.UPower',
                                            '/org/freedesktop/UPower',
-                                           Lang.bind(this, function(proxy, error) {
+                                           (proxy, error) => {
                                                if (error) {
                                                    log(error.message);
                                                    return;
@@ -305,7 +305,7 @@ var EndSessionDialog = new Lang.Class({
                                                this._powerProxy.connect('g-properties-changed',
                                                                         Lang.bind(this, this._sync));
                                                this._sync();
-                                           }));
+                                           });
 
         this._secondsLeft = 0;
         this._totalSecondsToStayOpen = 0;
@@ -485,14 +485,13 @@ var EndSessionDialog = new Lang.Class({
         for (let i = 0; i < dialogContent.confirmButtons.length; i++) {
             let signal = dialogContent.confirmButtons[i].signal;
             let label = dialogContent.confirmButtons[i].label;
-            buttons.push({ action: Lang.bind(this, function() {
+            buttons.push({ action: () => {
                                this.close(true);
-                                       let signalId = this.connect('closed',
-                                                                   Lang.bind(this, function() {
+                               let signalId = this.connect('closed', () => {
                                    this.disconnect(signalId);
                                    this._confirm(signal);
-                                                                   }));
-                                   }),
+                               });
+                           },
                            label: label });
         }
 
@@ -513,11 +512,11 @@ var EndSessionDialog = new Lang.Class({
     },
 
     _confirm(signal) {
-        let callback = Lang.bind(this, function() {
+        let callback = () => {
             this._fadeOutDialog();
             this._stopTimer();
             this._dbusImpl.emit_signal(signal, null);
-        });
+        };
 
         // Offline update not available; just emit the signal
         if (!this._checkBox.actor.visible) {
@@ -552,8 +551,7 @@ var EndSessionDialog = new Lang.Class({
     },
 
     _triggerOfflineUpdateReboot(callback) {
-        this._pkOfflineProxy.TriggerRemote('reboot',
-                                           function (result, error) {
+        this._pkOfflineProxy.TriggerRemote('reboot', (result, error) => {
             if (error)
                 log(error.message);
 
@@ -562,8 +560,7 @@ var EndSessionDialog = new Lang.Class({
     },
 
     _triggerOfflineUpdateShutdown(callback) {
-        this._pkOfflineProxy.TriggerRemote('power-off',
-                                           function (result, error) {
+        this._pkOfflineProxy.TriggerRemote('power-off', (result, error) => {
             if (error)
                 log(error.message);
 
@@ -572,7 +569,7 @@ var EndSessionDialog = new Lang.Class({
     },
 
     _triggerOfflineUpdateCancel(callback) {
-        this._pkOfflineProxy.CancelRemote(function (result, error) {
+        this._pkOfflineProxy.CancelRemote((result, error) => {
             if (error)
                 log(error.message);
 
@@ -584,8 +581,7 @@ var EndSessionDialog = new Lang.Class({
         let startTime = GLib.get_monotonic_time();
         this._secondsLeft = this._totalSecondsToStayOpen;
 
-        this._timerId = Mainloop.timeout_add_seconds(1, Lang.bind(this,
-            function() {
+        this._timerId = Mainloop.timeout_add_seconds(1, () => {
             let currentTime = GLib.get_monotonic_time();
             let secondsElapsed = ((currentTime - startTime) / 1000000);
 
@@ -601,7 +597,7 @@ var EndSessionDialog = new Lang.Class({
             this._timerId = 0;
 
             return GLib.SOURCE_REMOVE;
-            }));
+        });
         GLib.Source.set_name_by_id(this._timerId, '[gnome-shell] this._confirm');
     },
 
@@ -689,7 +685,7 @@ var EndSessionDialog = new Lang.Class({
     },
 
     _loadSessions() {
-        this._loginManager.listSessions(Lang.bind(this, function(result) {
+        this._loginManager.listSessions(result => {
             let n = 0;
             for (let i = 0; i < result.length; i++) {
                 let[id, uid, userName, seat, sessionPath] = result[i];
@@ -720,7 +716,7 @@ var EndSessionDialog = new Lang.Class({
             }
 
             this._sync();
-        }));
+        });
     },
 
     OpenAsync(parameters, invocation) {
@@ -750,9 +746,9 @@ var EndSessionDialog = new Lang.Class({
         let dialogContent = DialogContent[this._type];
 
         for (let i = 0; i < inhibitorObjectPaths.length; i++) {
-            let inhibitor = new GnomeSession.Inhibitor(inhibitorObjectPaths[i], Lang.bind(this, function(proxy, error) {
+            let inhibitor = new GnomeSession.Inhibitor(inhibitorObjectPaths[i], (proxy, error) => {
                 this._onInhibitorLoaded(proxy);
-            }));
+            });
 
             this._applications.push(inhibitor);
         }
@@ -787,11 +783,10 @@ var EndSessionDialog = new Lang.Class({
 
         this._sync();
 
-        let signalId = this.connect('opened',
-                                    Lang.bind(this, function() {
+        let signalId = this.connect('opened', () => {
             invocation.return_value(null);
             this.disconnect(signalId);
-                                    }));
+        });
     },
 
     Close(parameters, invocation) {

js/ui/environment.js

@@ -47,14 +47,14 @@ function _patchContainerClass(containerClass) {
 function _patchLayoutClass(layoutClass, styleProps) {
     if (styleProps)
         layoutClass.prototype.hookup_style = function(container) {
-            container.connect('style-changed', Lang.bind(this, function() {
+            container.connect('style-changed', () => {
                 let node = container.get_theme_node();
                 for (let prop in styleProps) {
                     let [found, length] = node.lookup_length(styleProps[prop], false);
                     if (found)
                         this[prop] = length;
                 }
-            }));
+            });
         };
     layoutClass.prototype.child_set = function(actor, props) {
         let meta = this.get_child_meta(actor.get_parent(), actor);
@@ -88,7 +88,7 @@ function init() {
     window._ = Gettext.gettext;
     window.C_ = Gettext.pgettext;
     window.ngettext = Gettext.ngettext;
-    window.N_ = function(s) { return s; };
+    window.N_ = s => s;
 
     // Miscellaneous monkeypatching
     _patchContainerClass(St.BoxLayout);

js/ui/extensionDownloader.js

@@ -30,7 +30,7 @@ function installExtension(uuid, invocation) {
 
     let message = Soup.form_request_new_from_hash('GET', REPOSITORY_URL_INFO, params);
 
-    _httpSession.queue_message(message, function(session, message) {
+    _httpSession.queue_message(message, (session, message) => {
         if (message.status_code != Soup.KnownStatusCode.OK) {
             ExtensionSystem.logExtensionError(uuid, 'downloading info: ' + message.status_code);
             invocation.return_dbus_error('org.gnome.Shell.DownloadInfoError', message.status_code.toString());
@@ -96,7 +96,7 @@ function gotExtensionZipFile(session, message, uuid, dir, callback, errback) {
         return;
     }
 
-    GLib.child_watch_add(GLib.PRIORITY_DEFAULT, pid, function(pid, status) {
+    GLib.child_watch_add(GLib.PRIORITY_DEFAULT, pid, (pid, status) => {
         GLib.spawn_close_pid(pid);
 
         if (status != 0)
@@ -119,8 +119,8 @@ function updateExtension(uuid) {
     let url = REPOSITORY_URL_DOWNLOAD.format(uuid);
     let message = Soup.form_request_new_from_hash('GET', url, params);
 
-    _httpSession.queue_message(message, Lang.bind(this, function(session, message) {
-        gotExtensionZipFile(session, message, uuid, newExtensionTmpDir, function() {
+    _httpSession.queue_message(message, (session, message) => {
+        gotExtensionZipFile(session, message, uuid, newExtensionTmpDir, () => {
             let oldExtension = ExtensionUtils.extensions[uuid];
             let extensionDir = oldExtension.dir;
 
@@ -151,10 +151,10 @@ function updateExtension(uuid) {
             }
 
             FileUtils.recursivelyDeleteDir(oldExtensionTmpDir, true);
-        }, function(code, message) {
+        }, (code, message) => {
             log('Error while updating extension %s: %s (%s)'.format(uuid, code, message ? message : ''));
         });
-    }));
+    });
 }
 
 function checkForUpdates() {
@@ -168,7 +168,7 @@ function checkForUpdates() {
 
     let url = REPOSITORY_URL_UPDATE;
     let message = Soup.form_request_new_from_hash('GET', url, params);
-    _httpSession.queue_message(message, function(session, message) {
+    _httpSession.queue_message(message, (session, message) => {
         if (message.status_code != Soup.KnownStatusCode.OK)
             return;
 
@@ -258,9 +258,9 @@ var InstallExtensionDialog = new Lang.Class({
             invocation.return_value(GLib.Variant.new('(s)', ['successful']));
         }
 
-        _httpSession.queue_message(message, Lang.bind(this, function(session, message) {
+        _httpSession.queue_message(message, (session, message) => {
             gotExtensionZipFile(session, message, uuid, dir, callback, errback);
-        }));
+        });
 
         this.close();
     }

js/ui/extensionSystem.js

@@ -273,17 +273,17 @@ function onEnabledExtensionsChanged() {
 
     // Find and enable all the newly enabled extensions: UUIDs found in the
     // new setting, but not in the old one.
-    newEnabledExtensions.filter(function(uuid) {
-        return enabledExtensions.indexOf(uuid) == -1;
-    }).forEach(function(uuid) {
+    newEnabledExtensions.filter(
+        uuid => !enabledExtensions.includes(uuid)
+    ).forEach(uuid => {
         enableExtension(uuid);
     });
 
     // Find and disable all the newly disabled extensions: UUIDs found in the
     // old setting, but not in the new one.
-    enabledExtensions.filter(function(item) {
-        return newEnabledExtensions.indexOf(item) == -1;
-    }).forEach(function(uuid) {
+    enabledExtensions.filter(
+        item => !newEnabledExtensions.includes(item)
+    ).forEach(uuid => {
         disableExtension(uuid);
     });
 
@@ -300,7 +300,7 @@ function _onVersionValidationChanged() {
     enabledExtensions = getEnabledExtensions();
 
     if (Main.sessionMode.allowExtensions) {
-        enabledExtensions.forEach(function(uuid) {
+        enabledExtensions.forEach(uuid => {
             enableExtension(uuid);
         });
     }
@@ -314,7 +314,7 @@ function _loadExtensions() {
     enabledExtensions = getEnabledExtensions();
 
     let finder = new ExtensionUtils.ExtensionFinder();
-    finder.connect('extension-found', function(finder, extension) {
+    finder.connect('extension-found', (finder, extension) => {
         loadExtension(extension);
     });
     finder.scanExtensions();
@@ -328,7 +328,7 @@ function enableAllExtensions() {
         _loadExtensions();
         initted = true;
     } else {
-        enabledExtensions.forEach(function(uuid) {
+        enabledExtensions.forEach(uuid => {
             enableExtension(uuid);
         });
     }
@@ -340,7 +340,7 @@ function disableAllExtensions() {
         return;
 
     if (initted) {
-        extensionOrder.slice().reverse().forEach(function(uuid) {
+        extensionOrder.slice().reverse().forEach(uuid => {
             disableExtension(uuid);
         });
     }

js/ui/grabHelper.js

@@ -67,7 +67,9 @@ var GrabHelper = new Lang.Class({
     // Adds @actor to the set of actors that are allowed to process events
     // during a grab.
     addActor(actor) {
-        actor.__grabHelperDestroyId = actor.connect('destroy', Lang.bind(this, function() { this.removeActor(actor); }));
+        actor.__grabHelperDestroyId = actor.connect('destroy', () => {
+            this.removeActor(actor);
+        });
         this._actors.push(actor);
     },
 

js/ui/ibusCandidatePopup.js

@@ -34,13 +34,13 @@ var CandidateArea = new Lang.Class({
             this.actor.add(box);
 
             let j = i;
-            box.connect('button-release-event', Lang.bind(this, function(actor, event) {
+            box.connect('button-release-event', (actor, event) => {
                 this.emit('candidate-clicked', j, event.get_button(), event.get_state());
                 return Clutter.EVENT_PROPAGATE;
-            }));
+            });
         }
 
-        this.actor.connect('scroll-event', Lang.bind(this, function(actor, event) {
+        this.actor.connect('scroll-event', (actor, event) => {
             let direction = event.get_scroll_direction();
             switch(direction) {
             case Clutter.ScrollDirection.UP:
@@ -51,7 +51,7 @@ var CandidateArea = new Lang.Class({
                 break;
             };
             return Clutter.EVENT_PROPAGATE;
-        }));
+        });
 
         this._buttonBox = new St.BoxLayout({ style_class: 'candidate-page-button-box' });
 
@@ -65,12 +65,12 @@ var CandidateArea = new Lang.Class({
 
         this.actor.add(this._buttonBox);
 
-        this._previousButton.connect('clicked', Lang.bind(this, function() {
+        this._previousButton.connect('clicked', () => {
             this.emit('previous-page');
-        }));
-        this._nextButton.connect('clicked', Lang.bind(this, function() {
+        });
+        this._nextButton.connect('clicked', () => {
             this.emit('next-page');
-        }));
+        });
 
         this._orientation = -1;
         this._cursorPosition = 0;
@@ -152,23 +152,23 @@ var CandidatePopup = new Lang.Class({
         this._candidateArea = new CandidateArea();
         box.add(this._candidateArea.actor);
 
-        this._candidateArea.connect('previous-page', Lang.bind(this, function() {
+        this._candidateArea.connect('previous-page', () => {
             this._panelService.page_up();
-        }));
-        this._candidateArea.connect('next-page', Lang.bind(this, function() {
+        });
+        this._candidateArea.connect('next-page', () => {
             this._panelService.page_down();
-        }));
+        });
 
-        this._candidateArea.connect('cursor-up', Lang.bind(this, function() {
+        this._candidateArea.connect('cursor-up', () => {
             this._panelService.cursor_up();
-        }));
-        this._candidateArea.connect('cursor-down', Lang.bind(this, function() {
+        });
+        this._candidateArea.connect('cursor-down', () => {
             this._panelService.cursor_down();
-        }));
+        });
 
-        this._candidateArea.connect('candidate-clicked', Lang.bind(this, function(ca, index, button, state) {
+        this._candidateArea.connect('candidate-clicked', () => {
             this._panelService.candidate_clicked(index, button, state);
-        }));
+        });
 
         this._panelService = null;
     },
@@ -178,26 +178,23 @@ var CandidatePopup = new Lang.Class({
         if (!panelService)
             return;
 
-        panelService.connect('set-cursor-location',
-                             Lang.bind(this, function(ps, x, y, w, h) {
+        panelService.connect('set-cursor-location', (ps, x, y, w, h) => {
             this._setDummyCursorGeometry(x, y, w, h);
-                             }));
+        });
         try {
-            panelService.connect('set-cursor-location-relative',
-                                 Lang.bind(this, function(ps, x, y, w, h) {
+            panelService.connect('set-cursor-location-relative', (ps, x, y, w, h) => {
                 if (!global.display.focus_window)
                     return;
                 let window = global.display.focus_window.get_compositor_private();
                 this._setDummyCursorGeometry(window.x + x, window.y + y, w, h);
-                                 }));
+            });
         } catch(e) {
             // Only recent IBus versions have support for this signal
             // which is used for wayland clients. In order to work
             // with older IBus versions we can silently ignore the
             // signal's absence.
         }
-        panelService.connect('update-preedit-text',
-                             Lang.bind(this, function(ps, text, cursorPosition, visible) {
+        panelService.connect('update-preedit-text', (ps, text, cursorPosition, visible) => {
             this._preeditText.visible = visible;
             this._updateVisibility();
 
@@ -207,36 +204,30 @@ var CandidatePopup = new Lang.Class({
             if (attrs)
                 this._setTextAttributes(this._preeditText.clutter_text,
                                         attrs);
-                             }));
-        panelService.connect('show-preedit-text',
-                             Lang.bind(this, function(ps) {
+        });
+        panelService.connect('show-preedit-text', ps => {
             this._preeditText.show();
             this._updateVisibility();
-                             }));
-        panelService.connect('hide-preedit-text',
-                             Lang.bind(this, function(ps) {
+        });
+        panelService.connect('hide-preedit-text', ps => {
             this._preeditText.hide();
             this._updateVisibility();
-                             }));
-        panelService.connect('update-auxiliary-text',
-                             Lang.bind(this, function(ps, text, visible) {
+        });
+        panelService.connect('update-auxiliary-text', (ps, text, visible) => {
             this._auxText.visible = visible;
             this._updateVisibility();
 
             this._auxText.text = text.get_text();
-                             }));
-        panelService.connect('show-auxiliary-text',
-                             Lang.bind(this, function(ps) {
+        });
+        panelService.connect('show-auxiliary-text', ps => {
             this._auxText.show();
             this._updateVisibility();
-                             }));
-        panelService.connect('hide-auxiliary-text',
-                             Lang.bind(this, function(ps) {
+        });
+        panelService.connect('hide-auxiliary-text', ps => {
             this._auxText.hide();
             this._updateVisibility();
-                             }));
-        panelService.connect('update-lookup-table',
-                             Lang.bind(this, function(ps, lookupTable, visible) {
+        });
+        panelService.connect('update-lookup-table', (ps, lookupTable, visible) => {
             this._candidateArea.actor.visible = visible;
             this._updateVisibility();
 
@@ -259,10 +250,10 @@ var CandidatePopup = new Lang.Class({
             for (let i = startIndex; i < endIndex; ++i) {
                 candidates.push(lookupTable.get_candidate(i).get_text());
 
-                                     Main.keyboard.addSuggestion(lookupTable.get_candidate(i).get_text(), Lang.bind(this, function() {
+                Main.keyboard.addSuggestion(lookupTable.get_candidate(i).get_text(), () => {
                     let index = i;
                     this._panelService.candidate_clicked(index, 1, 0);
-                                     }));
+                });
             }
 
             this._candidateArea.setCandidates(indexes,
@@ -271,22 +262,19 @@ var CandidatePopup = new Lang.Class({
                                               lookupTable.is_cursor_visible());
             this._candidateArea.setOrientation(lookupTable.get_orientation());
             this._candidateArea.updateButtons(lookupTable.is_round(), page, nPages);
-                             }));
-        panelService.connect('show-lookup-table',
-                             Lang.bind(this, function(ps) {
+        });
+        panelService.connect('show-lookup-table', ps => {
             this._candidateArea.actor.show();
             this._updateVisibility();
-                             }));
-        panelService.connect('hide-lookup-table',
-                             Lang.bind(this, function(ps) {
+        });
+        panelService.connect('hide-lookup-table', ps => {
             this._candidateArea.actor.hide();
             this._updateVisibility();
-                             }));
-        panelService.connect('focus-out',
-                             Lang.bind(this, function(ps) {
+        });
+        panelService.connect('focus-out', ps => {
             this._boxPointer.hide(BoxPointer.PopupAnimation.NONE);
             Main.keyboard.resetSuggestions();
-                             }));
+        });
     },
 
     _setDummyCursorGeometry(x, y, w, h) {

js/ui/iconGrid.js

@@ -321,11 +321,7 @@ var IconGrid = new Lang.Class({
     },
 
     _getVisibleChildren() {
-        let children = this._grid.get_children();
-        children = children.filter(function(actor) {
-            return actor.visible;
-        });
-        return children;
+        return this._grid.get_children().filter(actor => actor.visible);
     },
 
     _getPreferredHeight(grid, forWidth, alloc) {
@@ -462,19 +458,19 @@ var IconGrid = new Lang.Class({
                               delay: delay,
                               scale_x: ANIMATION_BOUNCE_ICON_SCALE,
                               scale_y: ANIMATION_BOUNCE_ICON_SCALE,
-                              onComplete: Lang.bind(this, function() {
+                              onComplete: () => {
                                   Tweener.addTween(actor,
                                                    { time: ANIMATION_TIME_IN - bounceUpTime,
                                                      transition: 'easeInOutQuad',
                                                      scale_x: 1,
                                                      scale_y: 1,
-                                                     onComplete: Lang.bind(this, function() {
+                                                     onComplete: () => {
                                                         if (isLastItem)
                                                             this._animationDone();
                                                         actor.reactive = true;
-                                                    })
+                                                    }
                                                    });
-                              })
+                              }
                             });
         }
     },
@@ -495,15 +491,15 @@ var IconGrid = new Lang.Class({
         // Design decision, 1/2 of the source actor size.
         let [sourceScaledWidth, sourceScaledHeight] = [sourceWidth / 2, sourceHeight / 2];
 
-        actors.forEach(function(actor) {
+        actors.forEach(actor => {
             let [actorX, actorY] = actor._transformedPosition = actor.get_transformed_position();
             let [x, y] = [actorX - sourceX, actorY - sourceY];
             actor._distance = Math.sqrt(x * x + y * y);
         });
-        let maxDist = actors.reduce(function(prev, cur) {
+        let maxDist = actors.reduce((prev, cur) => {
             return Math.max(prev, cur._distance);
         }, 0);
-        let minDist = actors.reduce(function(prev, cur) {
+        let minDist = actors.reduce((prev, cur) => {
             return Math.min(prev, cur._distance);
         }, Infinity);
         let normalization = maxDist - minDist;
@@ -541,14 +537,14 @@ var IconGrid = new Lang.Class({
                                    y: finalY,
                                    scale_x: 1,
                                    scale_y: 1,
-                                   onComplete: Lang.bind(this, function() {
+                                   onComplete: () => {
                                        if (isLastItem)
                                            this._animationDone();
 
                                        actor.opacity = 255;
                                        actor.reactive = true;
                                        actorClone.destroy();
-                                   })};
+                                   }};
                 fadeParams = { time: ANIMATION_FADE_IN_TIME_FOR_ITEM,
                                transition: 'easeInOutQuad',
                                delay: delay,
@@ -567,14 +563,14 @@ var IconGrid = new Lang.Class({
                                    y: adjustedSourcePositionY,
                                    scale_x: scaleX,
                                    scale_y: scaleY,
-                                   onComplete: Lang.bind(this, function() {
+                                   onComplete: () => {
                                        if (isLastItem) {
                                            this._animationDone();
                                            this._restoreItemsOpacity();
                                        }
                                        actor.reactive = true;
                                        actorClone.destroy();
-                                   })};
+                                   }};
                 fadeParams = { time: ANIMATION_FADE_IN_TIME_FOR_ITEM,
                                transition: 'easeInOutQuad',
                                delay: ANIMATION_TIME_OUT + delay - ANIMATION_FADE_IN_TIME_FOR_ITEM,
@@ -1000,10 +996,7 @@ var PaginatedIconGrid = new Lang.Class({
                            transition: 'easeInOutQuad'
                          };
             if (i == (children.length - 1))
-                params.onComplete = Lang.bind(this,
-                    function() {
-                        this.emit('space-opened');
-                    });
+                params.onComplete = () => { this.emit('space-opened'); };
             Tweener.addTween(children[i], params);
         }
     },
@@ -1021,10 +1014,7 @@ var PaginatedIconGrid = new Lang.Class({
                              { translation_y: 0,
                                time: EXTRA_SPACE_ANIMATION_TIME,
                                transition: 'easeInOutQuad',
-                               onComplete: Lang.bind(this,
-                                   function() {
-                                       this.emit('space-closed');
-                                   })
+                               onComplete: () => { this.emit('space-closed'); }
                              });
         }
     }

js/ui/keyboard.js

@@ -189,19 +189,19 @@ var LanguageSelectionPopup = new Lang.Class({
         for (let i in inputSources) {
             let is = inputSources[i];
 
-            this.addAction(is.displayName, Lang.bind(this, () => {
+            this.addAction(is.displayName, () => {
                 inputSourceManager.activateInputSource(is, true);
-            }));
+            });
         }
 
         this.addMenuItem(new PopupMenu.PopupSeparatorMenuItem());
         this.addAction(_("Region & Language Settings"), Lang.bind(this, this._launchSettings));
         this._capturedEventId = 0;
 
-        this._unmapId = actor.connect('notify::mapped', Lang.bind(this, function() {
+        this._unmapId = actor.connect('notify::mapped', () => {
             if (!actor.is_mapped())
                 this.close(true);
-        }));
+        });
     },
 
     _launchSettings() {
@@ -304,7 +304,7 @@ var Key = new Lang.Class({
         if (key == this.key) {
             this._pressTimeoutId = GLib.timeout_add(GLib.PRIORITY_DEFAULT,
                                                     KEY_LONG_PRESS_TIME,
-                                                    Lang.bind(this, function() {
+                                                    () => {
                                                         this._longPress = true;
                                                         this._pressTimeoutId = 0;
 
@@ -319,7 +319,7 @@ var Key = new Lang.Class({
                                                         }
 
                                                         return GLib.SOURCE_REMOVE;
-                                                    }));
+                                                    });
         }
     },
 
@@ -358,10 +358,10 @@ var Key = new Lang.Class({
         this._boxPointer.show(BoxPointer.PopupAnimation.FULL);
         this._capturedEventId = global.stage.connect('captured-event',
                                                      Lang.bind(this, this._onCapturedEvent));
-        this._unmapId = this.keyButton.connect('notify::mapped', Lang.bind(this, function() {
+        this._unmapId = this.keyButton.connect('notify::mapped', () => {
             if (!this.keyButton.is_mapped())
                 this._hideSubkeys();
-        }));
+        });
     },
 
     _hideSubkeys() {
@@ -384,18 +384,15 @@ var Key = new Lang.Class({
                                       style_class: 'keyboard-key' });
 
         button.keyWidth = 1;
-        button.connect('button-press-event', Lang.bind(this,
-            function () {
+        button.connect('button-press-event', () => {
             this._press(key);
             return Clutter.EVENT_PROPAGATE;
-            }));
-        button.connect('button-release-event', Lang.bind(this,
-            function () {
+        });
+        button.connect('button-release-event', () => {
             this._release(key);
             return Clutter.EVENT_PROPAGATE;
-            }));
-        button.connect('touch-event', Lang.bind(this,
-            function (actor, event) {
+        });
+        button.connect('touch-event', (actor, event) => {
             let device = event.get_device();
             let sequence = event.get_event_sequence();
 
@@ -422,7 +419,7 @@ var Key = new Lang.Class({
                 this._release(key);
             }
             return Clutter.EVENT_PROPAGATE;
-            }));
+        });
 
         return button;
     },
@@ -513,8 +510,8 @@ var Keyboard = new Lang.Class({
         this._lastDeviceId = null;
         this._suggestions = null;
 
-        Meta.get_backend().connect('last-device-changed', Lang.bind(this,
-            function (backend, deviceId) {
+        Meta.get_backend().connect('last-device-changed', 
+            (backend, deviceId) => {
                 let manager = Clutter.DeviceManager.get_default();
                 let device = manager.get_device(deviceId);
 
@@ -522,26 +519,26 @@ var Keyboard = new Lang.Class({
                     this._lastDeviceId = deviceId;
                     this._syncEnabled();
                 }
-            }));
+            });
         this._syncEnabled();
 
         this._showIdleId = 0;
 
         this._keyboardVisible = false;
-        Main.layoutManager.connect('keyboard-visible-changed', Lang.bind(this, function(o, visible) {
+        Main.layoutManager.connect('keyboard-visible-changed', (o, visible) => {
             this._keyboardVisible = visible;
-        }));
+        });
         this._keyboardRequested = false;
         this._keyboardRestingId = 0;
 
         Main.layoutManager.connect('monitors-changed', Lang.bind(this, this._relayout));
-        //Main.inputMethod.connect('cursor-location-changed', Lang.bind(this, function(o, rect) {
+        //Main.inputMethod.connect('cursor-location-changed', (o, rect) => {
         //    if (this._keyboardVisible) {
         //        let currentWindow = global.screen.get_display().focus_window;
         //        this.setCursorLocation(currentWindow, rect.get_x(), rect.get_y(),
         //                               rect.get_width(), rect.get_height());
         //    }
-        //}));
+        //});
     },
 
     get visible() {
@@ -568,7 +565,7 @@ var Keyboard = new Lang.Class({
             GLib.source_remove(this._updateCaretPositionId);
         if (!this._keyboardRequested)
             return;
-        this._updateCaretPositionId = GLib.idle_add(GLib.PRIORITY_DEFAULT_IDLE, Lang.bind(this, function() {
+        this._updateCaretPositionId = GLib.idle_add(GLib.PRIORITY_DEFAULT_IDLE, () => {
             this._updateCaretPositionId = 0;
 
             let currentWindow = global.screen.get_display().focus_window;
@@ -595,7 +592,7 @@ var Keyboard = new Lang.Class({
             }
 
             return GLib.SOURCE_REMOVE;
-        }));
+        });
 
         GLib.Source.set_name_by_id(this._updateCaretPositionId, '[gnome-shell] this._updateCaretPosition');
     },
@@ -694,9 +691,9 @@ var Keyboard = new Lang.Class({
         this._current_page = null;
 
         this._suggestions = new Suggestions();
-        this._suggestions.connect('suggestion-clicked', Lang.bind(this, function(suggestions, str) {
+        this._suggestions.connect('suggestion-clicked', (suggestions, str) => {
             this._keyboardController.commitString(str);
-        }));
+        });
         this.actor.add(this._suggestions.actor,
                        { x_align: St.Align.MIDDLE,
                          x_fill: false });
@@ -734,11 +731,10 @@ var Keyboard = new Lang.Class({
         }
 
         if (!this._showIdleId) {
-          this._showIdleId = GLib.idle_add(GLib.PRIORITY_DEFAULT_IDLE,
-                                           Lang.bind(this, function() {
+          this._showIdleId = GLib.idle_add(GLib.PRIORITY_DEFAULT_IDLE, () => {
               this.show(Main.layoutManager.focusIndex);
               return GLib.SOURCE_REMOVE;
-                                           }));
+          });
           GLib.Source.set_name_by_id(this._showIdleId, '[gnome-shell] this.show');
         }
     },
@@ -782,7 +778,7 @@ var Keyboard = new Lang.Class({
             if (button.key == ' ')
                 button.setWidth(keys.length <= 3 ? 5 : 3);
 
-            button.connect('pressed', Lang.bind(this, function(actor, keyval, str) {
+            button.connect('pressed', (actor, keyval, str) => {
                 if (!Main.inputMethod.currentFocus ||
                     !this._keyboardController.commitString(str, true)) {
                     if (keyval != 0) {
@@ -790,8 +786,8 @@ var Keyboard = new Lang.Class({
                         button._keyvalPress = true;
                     }
                 }
-            }));
-            button.connect('released', Lang.bind(this, function(actor, keyval, str) {
+            });
+            button.connect('released', (actor, keyval, str) => {
                 if (keyval != 0) {
                     if (button._keyvalPress)
                         this._keyboardController.keyvalRelease(keyval);
@@ -800,7 +796,7 @@ var Keyboard = new Lang.Class({
 
                 if (!this._latched)
                     this._setActiveLayer(0);
-            }));
+            });
 
             layout.appendKey(button.actor, button.keyButton.keyWidth);
         }
@@ -833,7 +829,7 @@ var Keyboard = new Lang.Class({
 
             let actor = extraButton.keyButton;
 
-            extraButton.connect('pressed', Lang.bind(this, function() {
+            extraButton.connect('pressed', () => {
                 if (switchToLevel != null) {
                     this._setActiveLayer(switchToLevel);
                     // Shift only gets latched on long press
@@ -841,23 +837,23 @@ var Keyboard = new Lang.Class({
                 } else if (keyval != null) {
                     this._keyboardController.keyvalPress(keyval);
                 }
-            }));
-            extraButton.connect('released', Lang.bind(this, function() {
+            });
+            extraButton.connect('released', () => {
                 if (keyval != null)
                     this._keyboardController.keyvalRelease(keyval);
                 else if (action == 'hide')
                     this.hide();
                 else if (action == 'languageMenu')
                     this._popupLanguageMenu(actor);
-            }));
+            });
 
             if (switchToLevel == 0) {
                 layout.shiftKeys.push(extraButton);
             } else if (switchToLevel == 1) {
-                extraButton.connect('long-press', Lang.bind(this, function() {
+                extraButton.connect('long-press', () => {
                     this._latched = true;
                     this._setCurrentLevelLatched(this._current_page, this._latched);
-                }));
+                });
             }
 
             /* Fixup default keys based on the number of levels/keys */
@@ -1019,11 +1015,11 @@ var Keyboard = new Lang.Class({
         this._clearKeyboardRestTimer();
         this._keyboardRestingId = GLib.timeout_add(GLib.PRIORITY_DEFAULT,
                                                    KEYBOARD_REST_TIME,
-                                                   Lang.bind(this, function() {
+                                                   () => {
                                                        this._clearKeyboardRestTimer();
                                                        this._show(monitor);
                                                        return GLib.SOURCE_REMOVE;
-                                                   }));
+                                                   });
         GLib.Source.set_name_by_id(this._keyboardRestingId, '[gnome-shell] this._clearKeyboardRestTimer');
     },
 
@@ -1051,11 +1047,11 @@ var Keyboard = new Lang.Class({
         this._clearKeyboardRestTimer();
         this._keyboardRestingId = GLib.timeout_add(GLib.PRIORITY_DEFAULT,
                                                    KEYBOARD_REST_TIME,
-                                                   Lang.bind(this, function() {
+                                                   () => {
                                                        this._clearKeyboardRestTimer();
                                                        this._hide();
                                                        return GLib.SOURCE_REMOVE;
-                                                   }));
+                                                   });
         GLib.Source.set_name_by_id(this._keyboardRestingId, '[gnome-shell] this._clearKeyboardRestTimer');
     },
 
@@ -1177,7 +1173,9 @@ var KeyboardController = new Lang.Class({
 
         Main.inputMethod.connect('notify::content-purpose', Lang.bind(this, this._onContentPurposeHintsChanged));
         Main.inputMethod.connect('notify::content-hints', Lang.bind(this, this._onContentPurposeHintsChanged));
-        Main.inputMethod.connect('input-panel-state', Lang.bind(this, function(o, state) { this.emit('panel-state', state); }));
+        Main.inputMethod.connect('input-panel-state', (o, state) => {
+            this.emit('panel-state', state);
+        });
     },
 
     _onSourcesModified() {

js/ui/layout.js

@@ -101,16 +101,18 @@ var MonitorConstraint = new Lang.Class({
     vfunc_set_actor(actor) {
         if (actor) {
             if (!this._monitorsChangedId) {
-                this._monitorsChangedId = Main.layoutManager.connect('monitors-changed', Lang.bind(this, function() {
+                this._monitorsChangedId =
+                    Main.layoutManager.connect('monitors-changed', () => {
                         this.actor.queue_relayout();
-                }));
+                    });
             }
 
             if (!this._workareasChangedId) {
-                this._workareasChangedId = global.screen.connect('workareas-changed', Lang.bind(this, function() {
+                this._workareasChangedId =
+                    global.screen.connect('workareas-changed', () => {
                         if (this._workArea)
                             this.actor.queue_relayout();
-                }));
+                    });
             }
         } else {
             if (this._monitorsChangedId)
@@ -201,19 +203,16 @@ var LayoutManager = new Lang.Class({
 
         // Set up stage hierarchy to group all UI actors under one container.
         this.uiGroup = new Shell.GenericContainer({ name: 'uiGroup' });
-        this.uiGroup.connect('allocate',
-                        function (actor, box, flags) {
+        this.uiGroup.connect('allocate', (actor, box, flags) => {
             let children = actor.get_children();
             for (let i = 0; i < children.length; i++)
                 children[i].allocate_preferred_size(flags);
         });
-        this.uiGroup.connect('get-preferred-width',
-                        function(actor, forHeight, alloc) {
+        this.uiGroup.connect('get-preferred-width', (actor, forHeight, alloc) => {
             let width = global.stage.width;
             [alloc.min_size, alloc.natural_size] = [width, width];
         });
-        this.uiGroup.connect('get-preferred-height',
-                        function(actor, forWidth, alloc) {
+        this.uiGroup.connect('get-preferred-height', (actor, forWidth, alloc) => {
             let height = global.stage.height;
             [alloc.min_size, alloc.natural_size] = [height, height];
         });
@@ -285,7 +284,7 @@ var LayoutManager = new Lang.Class({
         // https://bugzilla.gnome.org/show_bug.cgi?id=739178
         if (Shell.util_need_background_refresh()) {
             LoginManager.getLoginManager().connect('prepare-for-sleep',
-                                                   function(lm, suspending) {
+                (lm, suspending) => {
                     if (suspending)
                         return;
                     Meta.Background.refresh_all();
@@ -359,7 +358,7 @@ var LayoutManager = new Lang.Class({
 
     _updateHotCorners() {
         // destroy old hot corners
-        this.hotCorners.forEach(function(corner) {
+        this.hotCorners.forEach(corner => {
             if (corner)
                 corner.destroy();
         });
@@ -487,7 +486,7 @@ var LayoutManager = new Lang.Class({
         this._updatePanelBarrier();
 
         let size = this.panelBox.height;
-        this.hotCorners.forEach(function(corner) {
+        this.hotCorners.forEach(corner => {
             if (corner)
                 corner.setBarrierSize(size);
         });
@@ -584,13 +583,13 @@ var LayoutManager = new Lang.Class({
                                                       coordinate: Clutter.BindCoordinate.ALL });
         this._systemBackground.actor.add_constraint(constraint);
 
-        let signalId = this._systemBackground.connect('loaded', Lang.bind(this, function() {
+        let signalId = this._systemBackground.connect('loaded', () => {
             this._systemBackground.disconnect(signalId);
             this._systemBackground.actor.show();
             global.stage.show();
 
             this._prepareStartupAnimation();
-        }));
+        });
     },
 
     // Startup Animations
@@ -652,10 +651,10 @@ var LayoutManager = new Lang.Class({
         // until the event loop is uncontended and idle.
         // This helps to prevent us from running the animation
         // when the system is bogged down
-        let id = GLib.idle_add(GLib.PRIORITY_LOW, Lang.bind(this, function() {
+        let id = GLib.idle_add(GLib.PRIORITY_LOW, () => {
             this._startupAnimation();
             return GLib.SOURCE_REMOVE;
-        }));
+        });
         GLib.Source.set_name_by_id(id, '[gnome-shell] this._startupAnimation');
     },
 
@@ -727,9 +726,9 @@ var LayoutManager = new Lang.Class({
         // anchor point changes
         this._updateRegions();
 
-        this._keyboardHeightNotifyId = this.keyboardBox.connect('notify::height', Lang.bind(this, function () {
+        this._keyboardHeightNotifyId = this.keyboardBox.connect('notify::height', () => {
             this.keyboardBox.anchor_y = this.keyboardBox.height;
-        }));
+        });
     },
 
     hideKeyboard(immediate) {
@@ -940,7 +939,7 @@ var LayoutManager = new Lang.Class({
     },
 
     _getWindowActorsForWorkspace(workspace) {
-        return global.get_window_actors().filter(function (actor) {
+        return global.get_window_actors().filter(actor => {
             let win = actor.meta_window;
             return win.located_on_workspace(workspace);
         });
@@ -1359,7 +1358,7 @@ var PressureBarrier = new Lang.Class({
 
     _onBarrierLeft(barrier, event) {
         barrier._isHit = false;
-        if (this._barriers.every(function(b) { return !b._isHit; })) {
+        if (this._barriers.every(b => !b._isHit)) {
             this._reset();
             this._isTriggered = false;
         }

js/ui/lightbox.js

@@ -171,20 +171,20 @@ var Lightbox = new Lang.Class({
                                vignetteSharpness: VIGNETTE_SHARPNESS,
                                time: fadeInTime,
                                transition: 'easeOutQuad',
-                               onComplete: Lang.bind(this, function() {
+                               onComplete: () => {
                                    this.shown = true;
                                    this.emit('shown');
-                               })
+                               }
                              });
         } else {
             Tweener.addTween(this.actor,
                              { opacity: 255 * this._fadeFactor,
                                time: fadeInTime,
                                transition: 'easeOutQuad',
-                               onComplete: Lang.bind(this, function() {
+                               onComplete: () => {
                                    this.shown = true;
                                    this.emit('shown');
-                               })
+                               }
                              });
         }
 
@@ -203,18 +203,18 @@ var Lightbox = new Lang.Class({
                                opacity: 0,
                                time: fadeOutTime,
                                transition: 'easeOutQuad',
-                               onComplete: Lang.bind(this, function() {
+                               onComplete: () => {
                                    this.actor.hide();
-                               })
+                               }
                              });
         } else {
             Tweener.addTween(this.actor,
                              { opacity: 0,
                                time: fadeOutTime,
                                transition: 'easeOutQuad',
-                               onComplete: Lang.bind(this, function() {
+                               onComplete: () => {
                                    this.actor.hide();
-                               })
+                               }
                              });
         }
     },

js/ui/lookingGlass.js

@@ -53,7 +53,9 @@ var AUTO_COMPLETE_GLOBAL_KEYWORDS = _getAutoCompleteGlobalKeywords();
 function _getAutoCompleteGlobalKeywords() {
     const keywords = ['true', 'false', 'null', 'new'];
     // Don't add the private properties of window (i.e., ones starting with '_')
-    const windowProperties = Object.getOwnPropertyNames(window).filter(function(a){ return a.charAt(0) != '_' });
+    const windowProperties = Object.getOwnPropertyNames(window).filter(
+        a => a.charAt(0) != '_'
+    );
     const headerProperties = JsParse.getDeclaredConstants(commandHeader);
 
     return keywords.concat(windowProperties).concat(headerProperties);
@@ -142,10 +144,10 @@ var Notebook = new Lang.Class({
                                           reactive: true,
                                           track_hover: true });
         let label = new St.Button({ label: name });
-        label.connect('clicked', Lang.bind(this, function () {
+        label.connect('clicked', () => {
             this.selectChild(child);
             return true;
-        }));
+        });
         labelBox.add(label, { expand: true });
         this.tabControls.add(labelBox);
 
@@ -163,8 +165,8 @@ var Notebook = new Lang.Class({
         this.actor.add(scrollview, { expand: true });
 
         let vAdjust = scrollview.vscroll.adjustment;
-        vAdjust.connect('changed', Lang.bind(this, function () { this._onAdjustScopeChanged(tabData); }));
-        vAdjust.connect('notify::value', Lang.bind(this, function() { this._onAdjustValueChanged(tabData); }));
+        vAdjust.connect('changed', () => { this._onAdjustScopeChanged(tabData); });
+        vAdjust.connect('notify::value', () => { this._onAdjustValueChanged(tabData); });
 
         if (this._selectedIndex == -1)
             this.selectIndex(0);
@@ -821,34 +823,34 @@ var LookingGlass = new Lang.Class({
                                         icon_size: 24 });
         toolbar.add_actor(inspectIcon);
         inspectIcon.reactive = true;
-        inspectIcon.connect('button-press-event', Lang.bind(this, function () {
+        inspectIcon.connect('button-press-event', () => {
             let inspector = new Inspector(this);
-            inspector.connect('target', Lang.bind(this, function(i, target, stageX, stageY) {
+            inspector.connect('target', (i, target, stageX, stageY) => {
                 this._pushResult('inspect(' + Math.round(stageX) + ', ' + Math.round(stageY) + ')', target);
-            }));
-            inspector.connect('closed', Lang.bind(this, function() {
+            });
+            inspector.connect('closed', () => {
                 this.actor.show();
                 global.stage.set_key_focus(this._entry);
-            }));
+            });
             this.actor.hide();
             return Clutter.EVENT_STOP;
-        }));
+        });
 
         let gcIcon = new St.Icon({ icon_name: 'user-trash-full',
                                    icon_size: 24 });
         toolbar.add_actor(gcIcon);
         gcIcon.reactive = true;
-        gcIcon.connect('button-press-event', Lang.bind(this, function () {
+        gcIcon.connect('button-press-event', () => {
            gcIcon.icon_name = 'user-trash';
            System.gc();
-           this._timeoutId = Mainloop.timeout_add(500, Lang.bind(this, function () {
+           this._timeoutId = Mainloop.timeout_add(500, () => {
                 gcIcon.icon_name = 'user-trash-full';
                 this._timeoutId = 0;
                 return GLib.SOURCE_REMOVE;
-           }));
+           });
            GLib.Source.set_name_by_id(this._timeoutId, '[gnome-shell] gcIcon.icon_name = \'user-trash-full\'');
            return Clutter.EVENT_PROPAGATE;
-        }));
+        });
 
         let notebook = new Notebook();
         this._notebook = notebook;
@@ -880,7 +882,7 @@ var LookingGlass = new Lang.Class({
         this._extensions = new Extensions(this);
         notebook.appendPage('Extensions', this._extensions.actor);
 
-        this._entry.clutter_text.connect('activate', Lang.bind(this, function (o, e) {
+        this._entry.clutter_text.connect('activate', (o, e) => {
             // Hide any completions we are currently showing
             this._hideCompletions();
 
@@ -894,21 +896,21 @@ var LookingGlass = new Lang.Class({
                 return true;
             this._evaluate(text);
             return true;
-        }));
+        });
 
         this._history = new History.HistoryManager({ gsettingsKey: HISTORY_KEY, 
                                                      entry: this._entry.clutter_text });
 
         this._autoComplete = new AutoComplete(this._entry);
-        this._autoComplete.connect('suggest', Lang.bind(this, function(a,e) {
+        this._autoComplete.connect('suggest', (a, e) => {
             this._showCompletions(e.completions);
-        }));
+        });
         // If a completion is completed unambiguously, the currently-displayed completion
         // suggestions become irrelevant.
-        this._autoComplete.connect('completion', Lang.bind(this, function(a,e) {
+        this._autoComplete.connect('completion', (a, e) => {
             if (e.type == 'whole-word')
                 this._hideCompletions();
-        }));
+        });
 
         this._resize();
     },
@@ -987,9 +989,9 @@ var LookingGlass = new Lang.Class({
                                                       transition: 'easeOutQuad',
                                                       height: 0,
                                                       opacity: 0,
-                                                      onComplete: Lang.bind(this, function () {
+                                                      onComplete: () => {
                                                           this._completionActor.hide();
-                                                      })
+                                                      }
                                                     });
         }
     },
@@ -1030,8 +1032,7 @@ var LookingGlass = new Lang.Class({
     },
 
     _queueResize() {
-        Meta.later_add(Meta.LaterType.BEFORE_REDRAW,
-                       Lang.bind(this, function () { this._resize(); }));
+        Meta.later_add(Meta.LaterType.BEFORE_REDRAW, () => { this._resize(); });
     },
 
     _resize() {
@@ -1120,9 +1121,9 @@ var LookingGlass = new Lang.Class({
         Tweener.addTween(this.actor, { time: Math.min(0.5 / St.get_slow_down_factor(), 0.5),
                                        transition: 'easeOutQuad',
                                        y: this._hiddenY,
-                                       onComplete: Lang.bind(this, function () {
+                                       onComplete: () => {
                                            this.actor.hide();
-                                       })
+                                       }
                                      });
     }
 });

js/ui/magnifier.js

@@ -111,7 +111,7 @@ var Magnifier = new Lang.Class({
     setActive(activate) {
         let isActive = this.isActive();
 
-        this._zoomRegions.forEach (function(zoomRegion, index, array) {
+        this._zoomRegions.forEach ((zoomRegion, index, array) => {
             zoomRegion.setActive(activate);
         });
 
@@ -189,7 +189,7 @@ var Magnifier = new Lang.Class({
             this.yMouse = yMouse;
 
             let sysMouseOverAny = false;
-            this._zoomRegions.forEach(function(zoomRegion, index, array) {
+            this._zoomRegions.forEach((zoomRegion, index, array) => {
                 if (zoomRegion.scrollToMousePos())
                     sysMouseOverAny = true;
             });
@@ -287,7 +287,7 @@ var Magnifier = new Lang.Class({
         this.setCrosshairsClip(clip);
 
         let theCrossHairs = this._crossHairs;
-        this._zoomRegions.forEach (function(zoomRegion, index, array) {
+        this._zoomRegions.forEach ((zoomRegion, index, array) => {
             zoomRegion.addCrosshairs(theCrossHairs);
         });
     },
@@ -447,10 +447,9 @@ var Magnifier = new Lang.Class({
         this._appSettings = new Gio.Settings({ schema_id: APPLICATIONS_SCHEMA });
         this._settings = new Gio.Settings({ schema_id: MAGNIFIER_SCHEMA });
 
-        this._appSettings.connect('changed::' + SHOW_KEY,
-                                  Lang.bind(this, function() {
+        this._appSettings.connect('changed::' + SHOW_KEY, () => {
             this.setActive(this._appSettings.get_boolean(SHOW_KEY));
-        }));
+        });
 
         this._settings.connect('changed::' + SCREEN_POSITION_KEY,
                                Lang.bind(this, this._updateScreenPosition));
@@ -486,35 +485,29 @@ var Magnifier = new Lang.Class({
         this._settings.connect('changed::' + CONTRAST_BLUE_KEY,
                                Lang.bind(this, this._updateContrast));
 
-        this._settings.connect('changed::' + SHOW_CROSS_HAIRS_KEY,
-                               Lang.bind(this, function() {
+        this._settings.connect('changed::' + SHOW_CROSS_HAIRS_KEY, () => {
             this.setCrosshairsVisible(this._settings.get_boolean(SHOW_CROSS_HAIRS_KEY));
-        }));
+        });
 
-        this._settings.connect('changed::' + CROSS_HAIRS_THICKNESS_KEY,
-                               Lang.bind(this, function() {
+        this._settings.connect('changed::' + CROSS_HAIRS_THICKNESS_KEY, () => {
             this.setCrosshairsThickness(this._settings.get_int(CROSS_HAIRS_THICKNESS_KEY));
-        }));
+        });
 
-        this._settings.connect('changed::' + CROSS_HAIRS_COLOR_KEY,
-                               Lang.bind(this, function() {
+        this._settings.connect('changed::' + CROSS_HAIRS_COLOR_KEY, () => {
             this.setCrosshairsColor(this._settings.get_string(CROSS_HAIRS_COLOR_KEY));
-        }));
+        });
 
-        this._settings.connect('changed::' + CROSS_HAIRS_OPACITY_KEY,
-                               Lang.bind(this, function() {
+        this._settings.connect('changed::' + CROSS_HAIRS_OPACITY_KEY, () => {
             this.setCrosshairsOpacity(this._settings.get_double(CROSS_HAIRS_OPACITY_KEY));
-        }));
+        });
 
-        this._settings.connect('changed::' + CROSS_HAIRS_LENGTH_KEY,
-                               Lang.bind(this, function() {
+        this._settings.connect('changed::' + CROSS_HAIRS_LENGTH_KEY, () => {
             this.setCrosshairsLength(this._settings.get_int(CROSS_HAIRS_LENGTH_KEY));
-        }));
+        });
 
-        this._settings.connect('changed::' + CROSS_HAIRS_CLIP_KEY,
-                               Lang.bind(this, function() {
+        this._settings.connect('changed::' + CROSS_HAIRS_CLIP_KEY, () => {
             this.setCrosshairsClip(this._settings.get_boolean(CROSS_HAIRS_CLIP_KEY));
-        }));
+        });
 
         if (zoomRegion) {
             // Mag factor is accurate to two decimal places.
@@ -1088,10 +1081,10 @@ var ZoomRegion = new Lang.Class({
         }
 
         this._clearScrollContentsTimer();
-        this._scrollContentsTimerId = Mainloop.timeout_add(POINTER_REST_TIME, Lang.bind(this, function() {
+        this._scrollContentsTimerId = Mainloop.timeout_add(POINTER_REST_TIME, () => {
             this._scrollContentsToDelayed(x, y);
             return GLib.SOURCE_REMOVE;
-        }));
+        });
     },
 
     /**

js/ui/magnifierDBus.js

@@ -203,7 +203,7 @@ var ShellMagnifier = new Lang.Class({
         let zoomRegions = Main.magnifier.getZoomRegions();
         let objectPaths = [];
         let thoseZoomers = this._zoomers;
-        zoomRegions.forEach (function(aZoomRegion, index, array) {
+        zoomRegions.forEach ((aZoomRegion, index, array) => {
             let found = false;
             for (let objectPath in thoseZoomers) {
                 let proxyAndZoomRegion = thoseZoomers[objectPath];

js/ui/main.js

@@ -119,7 +119,9 @@ function start() {
     global.log = window.log;
 
     // Chain up async errors reported from C
-    global.connect('notify-error', function (global, msg, detail) { notifyError(msg, detail); });
+    global.connect('notify-error', (global, msg, detail) => {
+        notifyError(msg, detail);
+    });
 
     Gio.DesktopAppInfo.set_desktop_env('GNOME');
 
@@ -190,17 +192,17 @@ function _initializeUI() {
 
     _a11ySettings = new Gio.Settings({ schema_id: A11Y_SCHEMA });
 
-    global.display.connect('overlay-key', Lang.bind(overview, function () {
+    global.display.connect('overlay-key', () => {
         if (!_a11ySettings.get_boolean (STICKY_KEYS_ENABLE))
             overview.toggle();
-    }));
+    });
 
-    global.display.connect('show-restart-message', function(display, message) {
+    global.display.connect('show-restart-message', (display, message) => {
         showRestartMessage(message);
         return true;
     });
 
-    global.display.connect('restart', function() {
+    global.display.connect('restart', () => {
         global.reexec_self();
         return true;
     });
@@ -227,12 +229,12 @@ function _initializeUI() {
     ExtensionSystem.init();
 
     if (sessionMode.isGreeter && screenShield) {
-        layoutManager.connect('startup-prepared', function() {
+        layoutManager.connect('startup-prepared', () => {
             screenShield.showDialog();
         });
     }
 
-    layoutManager.connect('startup-complete', function() {
+    layoutManager.connect('startup-complete', () => {
         if (actionMode == Shell.ActionMode.NONE) {
             actionMode = Shell.ActionMode.NORMAL;
         }
@@ -423,7 +425,7 @@ function pushModal(actor, params) {
     }
 
     modalCount += 1;
-    let actorDestroyId = actor.connect('destroy', function() {
+    let actorDestroyId = actor.connect('destroy', () => {
         let index = _findModal(actor);
         if (index >= 0)
             popModal(actor);
@@ -432,7 +434,7 @@ function pushModal(actor, params) {
     let prevFocus = global.stage.get_key_focus();
     let prevFocusDestroyId;
     if (prevFocus != null) {
-        prevFocusDestroyId = prevFocus.connect('destroy', function() {
+        prevFocusDestroyId = prevFocus.connect('destroy', () => {
             let index = _findModal(actor);
             if (index >= 0)
                 modalActorFocusStack[index].prevFocus = null;
@@ -606,7 +608,7 @@ function _runBeforeRedrawQueue() {
 function _queueBeforeRedraw(workId) {
     _beforeRedrawQueue.push(workId);
     if (_beforeRedrawQueue.length == 1) {
-        Meta.later_add(Meta.LaterType.BEFORE_REDRAW, function () {
+        Meta.later_add(Meta.LaterType.BEFORE_REDRAW, () => {
             _runBeforeRedrawQueue();
             return false;
         });
@@ -636,12 +638,12 @@ function initializeDeferredWork(actor, callback, props) {
     let workId = '' + (++_deferredWorkSequence);
     _deferredWorkData[workId] = { 'actor': actor,
                                   'callback': callback };
-    actor.connect('notify::mapped', function () {
+    actor.connect('notify::mapped', () => {
         if (!(actor.mapped && _deferredWorkQueue.indexOf(workId) >= 0))
             return;
         _queueBeforeRedraw(workId);
     });
-    actor.connect('destroy', function() {
+    actor.connect('destroy', () => {
         let index = _deferredWorkQueue.indexOf(workId);
         if (index >= 0)
             _deferredWorkQueue.splice(index, 1);
@@ -673,7 +675,7 @@ function queueDeferredWork(workId) {
         _queueBeforeRedraw(workId);
         return;
     } else if (_deferredTimeoutId == 0) {
-        _deferredTimeoutId = Mainloop.timeout_add_seconds(DEFERRED_TIMEOUT_SECONDS, function () {
+        _deferredTimeoutId = Mainloop.timeout_add_seconds(DEFERRED_TIMEOUT_SECONDS, () => {
             _runAllDeferredWork();
             _deferredTimeoutId = 0;
             return GLib.SOURCE_REMOVE;

js/ui/messageList.js

@@ -48,7 +48,7 @@ var URLHighlighter = new Lang.Class({
         this.actor = new St.Label({ reactive: true, style_class: 'url-highlighter',
                                     x_expand: true, x_align: Clutter.ActorAlign.START });
         this._linkColor = '#ccccff';
-        this.actor.connect('style-changed', Lang.bind(this, function() {
+        this.actor.connect('style-changed', () => {
             let [hasColor, color] = this.actor.get_theme_node().lookup_color('link-color', false);
             if (hasColor) {
                 let linkColor = color.to_string().substr(0, 7);
@@ -57,12 +57,12 @@ var URLHighlighter = new Lang.Class({
                     this._highlightUrls();
                 }
             }
-        }));
+        });
         this.actor.clutter_text.line_wrap = lineWrap;
         this.actor.clutter_text.line_wrap_mode = Pango.WrapMode.WORD_CHAR;
 
         this.setMarkup(text, allowMarkup);
-        this.actor.connect('button-press-event', Lang.bind(this, function(actor, event) {
+        this.actor.connect('button-press-event', (actor, event) => {
             // Don't try to URL highlight when invisible.
             // The MessageTray doesn't actually hide us, so
             // we need to check for paint opacities as well.
@@ -73,8 +73,8 @@ var URLHighlighter = new Lang.Class({
             // a pointer grab, which would block our button-release-event
             // handler, if an URL is clicked
             return this._findUrlAtPos(event) != -1;
-        }));
-        this.actor.connect('button-release-event', Lang.bind(this, function (actor, event) {
+        });
+        this.actor.connect('button-release-event', (actor, event) => {
             if (!actor.visible || actor.get_paint_opacity() == 0)
                 return Clutter.EVENT_PROPAGATE;
 
@@ -88,8 +88,8 @@ var URLHighlighter = new Lang.Class({
                 return Clutter.EVENT_STOP;
             }
             return Clutter.EVENT_PROPAGATE;
-        }));
-        this.actor.connect('motion-event', Lang.bind(this, function(actor, event) {
+        });
+        this.actor.connect('motion-event', (actor, event) => {
             if (!actor.visible || actor.get_paint_opacity() == 0)
                 return Clutter.EVENT_PROPAGATE;
 
@@ -102,8 +102,8 @@ var URLHighlighter = new Lang.Class({
                 this._cursorChanged = false;
             }
             return Clutter.EVENT_PROPAGATE;
-        }));
-        this.actor.connect('leave-event', Lang.bind(this, function() {
+        });
+        this.actor.connect('leave-event', () => {
             if (!this.actor.visible || this.actor.get_paint_opacity() == 0)
                 return Clutter.EVENT_PROPAGATE;
 
@@ -112,7 +112,7 @@ var URLHighlighter = new Lang.Class({
                 global.screen.set_cursor(Meta.Cursor.DEFAULT);
             }
             return Clutter.EVENT_PROPAGATE;
-        }));
+        });
     },
 
     setMarkup(text, allowMarkup) {
@@ -183,10 +183,9 @@ var ScaleLayout = new Lang.Class({
 
         if (this._container)
             for (let signal of ['notify::scale-x', 'notify::scale-y']) {
-                let id = this._container.connect(signal, Lang.bind(this,
-                    function() {
+                let id = this._container.connect(signal, () => {
                     this.layout_changed();
-                    }));
+                });
                 this._signals.push(id);
             }
     },
@@ -541,7 +540,7 @@ var MessageListSection = new Lang.Class({
 
         let id = Main.sessionMode.connect('updated',
                                           Lang.bind(this, this._sync));
-        this.actor.connect('destroy', function() {
+        this.actor.connect('destroy', () => {
             Main.sessionMode.disconnect(id);
         });
 
@@ -585,14 +584,12 @@ var MessageListSection = new Lang.Class({
                                         scale_x: scale, scale_y: scale });
         obj.keyFocusId = message.actor.connect('key-focus-in',
             Lang.bind(this, this._onKeyFocusIn));
-        obj.destroyId = message.actor.connect('destroy',
-            Lang.bind(this, function() {
+        obj.destroyId = message.actor.connect('destroy', () => {
             this.removeMessage(message, false);
-            }));
-        obj.closeId = message.connect('close',
-            Lang.bind(this, function() {
+        });
+        obj.closeId = message.connect('close', () => {
             this.removeMessage(message, true);
-            }));
+        });
 
         this._messages.set(message, obj);
         obj.container.add_actor(message.actor);
@@ -614,13 +611,13 @@ var MessageListSection = new Lang.Class({
             return;
         }
 
-        let onComplete = Lang.bind(this, function() {
+        let onComplete = () => {
             this._list.set_child_at_index(obj.container, index);
             Tweener.addTween(obj.container, { scale_x: 1,
                                               scale_y: 1,
                                               time: MESSAGE_ANIMATION_TIME,
                                               transition: 'easeOutQuad' });
-        });
+        };
         Tweener.addTween(obj.container, { scale_x: 0,
                                           scale_y: 0,
                                           time: MESSAGE_ANIMATION_TIME,
@@ -652,13 +649,11 @@ var MessageListSection = new Lang.Class({
     },
 
     clear() {
-        let messages = [...this._messages.keys()].filter(function(message) {
-            return message.canClose();
-        });
+        let messages = [...this._messages.keys()].filter(msg => msg.canClose());
 
         // If there are few messages, letting them all zoom out looks OK
         if (messages.length < 2) {
-            messages.forEach(function(message) {
+            messages.forEach(message => {
                 message.close();
             });
         } else {

js/ui/messageTray.js

@@ -504,14 +504,13 @@ var NotificationBanner = new Lang.Class({
         this._addActions();
         this._addSecondaryIcon();
 
-        this._activatedId = this.notification.connect('activated',
-            Lang.bind(this, function() {
+        this._activatedId = this.notification.connect('activated', () => {
             // We hide all types of notifications once the user clicks on
             // them because the common outcome of clicking should be the
             // relevant window being brought forward and the user's
             // attention switching to the window.
             this.emit('done-displaying');
-            }));
+        });
     },
 
     _onDestroy() {
@@ -533,10 +532,9 @@ var NotificationBanner = new Lang.Class({
     },
 
     _addActions() {
-        this.notification.actions.forEach(Lang.bind(this,
-            function(action) {
+        this.notification.actions.forEach(action => {
             this.addAction(action.label, action.callback);
-            }));
+        });
     },
 
     _addSecondaryIcon() {
@@ -559,7 +557,7 @@ var NotificationBanner = new Lang.Class({
             return null;
 
         this._buttonBox.add(button);
-        button.connect('clicked', Lang.bind(this, function() {
+        button.connect('clicked', () => {
             callback();
 
             if (!this.notification.resident) {
@@ -570,7 +568,7 @@ var NotificationBanner = new Lang.Class({
                 this.emit('done-displaying');
                 this.notification.destroy();
             }
-        }));
+        });
 
         return button;
     },
@@ -596,10 +594,10 @@ var SourceActor = new Lang.Class({
         this.actor.connect('get-preferred-width', Lang.bind(this, this._getPreferredWidth));
         this.actor.connect('get-preferred-height', Lang.bind(this, this._getPreferredHeight));
         this.actor.connect('allocate', Lang.bind(this, this._allocate));
-        this.actor.connect('destroy', Lang.bind(this, function() {
+        this.actor.connect('destroy', () => {
             this._source.disconnect(this._iconUpdatedId);
             this._actorDestroyed = true;
-        }));
+        });
         this._actorDestroyed = false;
 
         let scale_factor = St.ThemeContext.get_for_stage(global.stage).scale_factor;
@@ -659,18 +657,18 @@ var SourceActorWithLabel = new Lang.Class({
                                         layout_manager: new Clutter.BinLayout() });
         this._counterBin.hide();
 
-        this._counterBin.connect('style-changed', Lang.bind(this, function() {
+        this._counterBin.connect('style-changed', () => {
             let themeNode = this._counterBin.get_theme_node();
             this._counterBin.translation_x = themeNode.get_length('-shell-counter-overlap-x');
             this._counterBin.translation_y = themeNode.get_length('-shell-counter-overlap-y');
-        }));
+        });
 
         this.actor.add_actor(this._counterBin);
 
         this._countUpdatedId = this._source.connect('count-updated', Lang.bind(this, this._updateCount));
         this._updateCount();
 
-        this.actor.connect('destroy', function() {
+        this.actor.connect('destroy', () => {
             this._source.disconnect(this._countUpdatedId);
         });
     },
@@ -736,7 +734,7 @@ var Source = new Lang.Class({
     },
 
     get unseenCount() {
-        return this.notifications.filter(function(n) { return !n.acknowledged; }).length;
+        return this.notifications.filter(n => !n.acknowledged).length;
     },
 
     get countVisible() {
@@ -844,17 +842,16 @@ var MessageTray = new Lang.Class({
     Name: 'MessageTray',
 
     _init() {
-        this._presence = new GnomeSession.Presence(Lang.bind(this, function(proxy, error) {
+        this._presence = new GnomeSession.Presence((proxy, error) => {
             this._onStatusChanged(proxy.status);
-        }));
+        });
         this._busy = false;
         this._bannerBlocked = false;
-        this._presence.connectSignal('StatusChanged', Lang.bind(this, function(proxy, senderName, [status]) {
+        this._presence.connectSignal('StatusChanged', (proxy, senderName, [status]) => {
             this._onStatusChanged(status);
-        }));
+        });
 
-        global.stage.connect('enter-event', Lang.bind(this,
-            function(a, ev) {
+        global.stage.connect('enter-event', (a, ev) => {
             // HACK: St uses ClutterInputDevice for hover tracking, which
             // misses relevant X11 events when untracked actors are
             // involved (read: the notification banner in normal mode),
@@ -863,7 +860,7 @@ var MessageTray = new Lang.Class({
             let related = ev.get_related();
             if (!related || this.actor.contains(related))
                 global.sync_pointer();
-            }));
+        });
 
         this.actor = new St.Widget({ visible: false,
                                      clip_to_allocation: true,
@@ -1093,9 +1090,9 @@ var MessageTray = new Lang.Class({
                 notification.connect('destroy',
                                      Lang.bind(this, this._onNotificationDestroy));
                 this._notificationQueue.push(notification);
-                this._notificationQueue.sort(function(notification1, notification2) {
-                    return (notification2.urgency - notification1.urgency);
-                });
+                this._notificationQueue.sort(
+                    (n1, n2) => n2.urgency - n1.urgency
+                );
                 this.emit('queue-changed');
             }
         }
@@ -1219,7 +1216,7 @@ var MessageTray = new Lang.Class({
 
         // Filter out acknowledged notifications.
         let changed = false;
-        this._notificationQueue = this._notificationQueue.filter(function(n) {
+        this._notificationQueue = this._notificationQueue.filter(n => {
             changed = changed || n.acknowledged;
             return !n.acknowledged;
         });
@@ -1310,9 +1307,9 @@ var MessageTray = new Lang.Class({
         this._banner = this._notification.createBanner();
         this._bannerClickedId = this._banner.connect('done-displaying',
                                                      Lang.bind(this, this._escapeTray));
-        this._bannerUnfocusedId = this._banner.connect('unfocused', Lang.bind(this, function() {
+        this._bannerUnfocusedId = this._banner.connect('unfocused', () => {
             this._updateState();
-        }));
+        });
 
         this._bannerBin.add_actor(this._banner.actor);
 

js/ui/modalDialog.js

@@ -142,11 +142,10 @@ var ModalDialog = new Lang.Class({
                          { opacity: 255,
                            time: this._shouldFadeIn ? OPEN_AND_CLOSE_TIME : 0,
                            transition: 'easeOutQuad',
-                           onComplete: Lang.bind(this,
-                               function() {
+                           onComplete: () => {
                                this.state = State.OPENED;
                                this.emit('opened');
-                               })
+                           }
                          });
     },
 
@@ -156,10 +155,10 @@ var ModalDialog = new Lang.Class({
 
         this._initialKeyFocus = actor;
 
-        this._initialKeyFocusDestroyId = actor.connect('destroy', Lang.bind(this, function() {
+        this._initialKeyFocusDestroyId = actor.connect('destroy', () => {
             this._initialKeyFocus = null;
             this._initialKeyFocusDestroyId = 0;
-        }));
+        });
     },
 
     open(timestamp, onPrimary) {
@@ -269,10 +268,9 @@ var ModalDialog = new Lang.Class({
                          { opacity: 0,
                            time:    FADE_OUT_DIALOG_TIME,
                            transition: 'easeOutQuad',
-                           onComplete: Lang.bind(this,
-                               function() {
+                           onComplete: () => {
                                this.state = State.FADED_OUT;
-                               })
+                           }
                          });
     }
 });

js/ui/mpris.js

@@ -60,19 +60,19 @@ var MediaMessage = new Lang.Class({
         this.setIcon(this._icon);
 
         this._prevButton = this.addMediaControl('media-skip-backward-symbolic',
-            Lang.bind(this, function() {
+            () => {
                 this._player.previous();
-            }));
+            });
 
         this._playPauseButton = this.addMediaControl(null,
-            Lang.bind(this, function() {
+            () => {
                 this._player.playPause();
-            }));
+            });
 
         this._nextButton = this.addMediaControl('media-skip-forward-symbolic',
-            Lang.bind(this, function() {
+            () => {
                 this._player.next();
-            }));
+            });
 
         this._player.connect('changed', Lang.bind(this, this._update));
         this._player.connect('closed', Lang.bind(this, this.close));
@@ -191,10 +191,10 @@ var MprisPlayer = new Lang.Class({
 
     _onMprisProxyReady() {
         this._ownerNotifyId = this._mprisProxy.connect('notify::g-name-owner',
-            Lang.bind(this, function() {
+            () => {
                 if (!this._mprisProxy.g_name_owner)
                     this._close();
-            }));
+            });
     },
 
     _onPlayerProxyReady() {
@@ -250,29 +250,27 @@ var MediaSection = new Lang.Class({
             return;
 
         let player = new MprisPlayer(busName);
-        player.connect('closed', Lang.bind(this,
-            function() {
+        player.connect('closed',
+            () => {
                 this._players.delete(busName);
-            }));
-        player.connect('show', Lang.bind(this,
-            function() {
+            });
+        player.connect('show',
+            () => {
                 let message = new MediaMessage(player);
                 this.addMessage(message, true);
-            }));
+            });
         this._players.set(busName, player);
     },
 
     _onProxyReady() {
-        this._proxy.ListNamesRemote(Lang.bind(this,
-            function([names]) {
-                names.forEach(Lang.bind(this,
-                    function(name) {
+        this._proxy.ListNamesRemote(([names]) => {
+            names.forEach(name => {
                 if (!name.startsWith(MPRIS_PLAYER_PREFIX))
                     return;
 
                 this._addPlayer(name);
-                    }));
-            }));
+            });
+        });
         this._proxy.connectSignal('NameOwnerChanged',
                                   Lang.bind(this, this._onNameOwnerChanged));
     },

js/ui/notificationDaemon.js

@@ -190,11 +190,11 @@ var FdoNotificationDaemon = new Lang.Class({
         source = new FdoNotificationDaemonSource(title, pid, sender, appId);
 
         this._sources.push(source);
-        source.connect('destroy', Lang.bind(this, function() {
+        source.connect('destroy', () => {
             let index = this._sources.indexOf(source);
             if (index >= 0)
                 this._sources.splice(index, 1);
-        }));
+        });
 
         Main.messageTray.add(source);
         return source;
@@ -220,11 +220,10 @@ var FdoNotificationDaemon = new Lang.Class({
             // Ignore replacesId since we already sent back a
             // NotificationClosed for that id.
             id = this._nextNotificationId++;
-            let idle_id = Mainloop.idle_add(Lang.bind(this,
-                                            function () {
+            let idle_id = Mainloop.idle_add(() => {
                 this._emitNotificationClosed(id, NotificationClosedReason.DISMISSED);
                 return GLib.SOURCE_REMOVE;
-                                            }));
+            });
             GLib.Source.set_name_by_id(idle_id, '[gnome-shell] this._emitNotificationClosed');
             return invocation.return_value(GLib.Variant.new('(u)', [id]));
         }
@@ -285,7 +284,7 @@ var FdoNotificationDaemon = new Lang.Class({
             return invocation.return_value(GLib.Variant.new('(u)', [id]));;
         }
 
-        this._busProxy.GetConnectionUnixProcessIDRemote(sender, Lang.bind(this, function (result, excp) {
+        this._busProxy.GetConnectionUnixProcessIDRemote(sender, (result, excp) => {
             // The app may have updated or removed the notification
             ndata = this._notifications[id];
             if (!ndata)
@@ -300,11 +299,11 @@ var FdoNotificationDaemon = new Lang.Class({
             source = this._getSource(appName, pid, ndata, sender, null);
 
             this._senderToPid[sender] = pid;
-            source.connect('destroy', Lang.bind(this, function() {
+            source.connect('destroy', () => {
                 delete this._senderToPid[sender];
-            }));
+            });
             this._notifyForSource(source, ndata);
-        }));
+        });
 
         return invocation.return_value(GLib.Variant.new('(u)', [id]));
     },
@@ -317,8 +316,7 @@ var FdoNotificationDaemon = new Lang.Class({
         if (notification == null) {
             notification = new MessageTray.Notification(source);
             ndata.notification = notification;
-            notification.connect('destroy', Lang.bind(this,
-                function(n, reason) {
+            notification.connect('destroy', (n, reason) => {
                 delete this._notifications[ndata.id];
                 let notificationClosedReason;
                 switch (reason) {
@@ -333,7 +331,7 @@ var FdoNotificationDaemon = new Lang.Class({
                         break;
                 }
                 this._emitNotificationClosed(ndata.id, notificationClosedReason);
-                }));
+            });
         }
 
         let gicon = this._iconForNotificationData(icon, hints);
@@ -365,20 +363,20 @@ var FdoNotificationDaemon = new Lang.Class({
                 if (actionId == 'default')
                     hasDefaultAction = true;
                 else
-                    notification.addAction(label, Lang.bind(this, function() {
+                    notification.addAction(label, () => {
                         this._emitActionInvoked(ndata.id, actionId);
-                    }));
+                    });
             }
         }
 
         if (hasDefaultAction) {
-            notification.connect('activated', Lang.bind(this, function() {
+            notification.connect('activated', () => {
                 this._emitActionInvoked(ndata.id, 'default');
-            }));
+            });
         } else {
-            notification.connect('activated', Lang.bind(this, function() {
+            notification.connect('activated', () => {
                 source.open();
-            }));
+            });
         }
 
         switch (hints.urgency) {
@@ -615,10 +613,10 @@ var GtkNotificationDaemonNotification = new Lang.Class({
         }
 
         if (buttons) {
-            buttons.deep_unpack().forEach(Lang.bind(this, function(button) {
+            buttons.deep_unpack().forEach(button => {
                 this.addAction(button.label.unpack(),
                                Lang.bind(this, this._onButtonClicked, button));
-            }));
+            });
         }
 
         this._defaultAction = defaultAction ? defaultAction.unpack() : null;
@@ -713,7 +711,7 @@ var GtkNotificationDaemonAppSource = new Lang.Class({
     },
 
     activateAction(actionId, target) {
-        this._createApp(function (app, error) {
+        this._createApp((app, error) => {
             if (error == null)
                 app.ActivateActionRemote(actionId, target ? [target] : [], getPlatformData());
             else
@@ -724,7 +722,7 @@ var GtkNotificationDaemonAppSource = new Lang.Class({
     },
 
     open() {
-        this._createApp(function (app, error) {
+        this._createApp((app, error) => {
             if (error == null)
                 app.ActivateRemote(getPlatformData());
             else
@@ -741,9 +739,9 @@ var GtkNotificationDaemonAppSource = new Lang.Class({
             this._notifications[notificationId].destroy();
 
         let notification = new GtkNotificationDaemonNotification(this, notificationParams);
-        notification.connect('destroy', Lang.bind(this, function() {
+        notification.connect('destroy', () => {
             delete this._notifications[notificationId];
-        }));
+        });
         this._notifications[notificationId] = notification;
 
         if (showBanner)
@@ -809,10 +807,10 @@ var GtkNotificationDaemon = new Lang.Class({
 
         let source = new GtkNotificationDaemonAppSource(appId);
 
-        source.connect('destroy', Lang.bind(this, function() {
+        source.connect('destroy', () => {
             delete this._sources[appId];
             this._saveNotifications();
-        }));
+        });
         source.connect('count-updated', Lang.bind(this, this._saveNotifications));
         Main.messageTray.add(source);
         this._sources[appId] = source;
@@ -825,7 +823,7 @@ var GtkNotificationDaemon = new Lang.Class({
         let value = global.get_persistent_state('a(sa(sv))', 'notifications');
         if (value) {
             let sources = value.deep_unpack();
-            sources.forEach(Lang.bind(this, function([appId, notifications]) {
+            sources.forEach(([appId, notifications]) => {
                 if (notifications.length == 0)
                     return;
 
@@ -836,10 +834,10 @@ var GtkNotificationDaemon = new Lang.Class({
                     return;
                 }
 
-                notifications.forEach(function([notificationId, notification]) {
+                notifications.forEach(([notificationId, notification]) => {
                     source.addNotification(notificationId, notification.deep_unpack(), false);
                 });
-            }));
+            });
         }
 
         this._isLoading = false;

js/ui/osdMonitorLabeler.js

@@ -82,9 +82,9 @@ var OsdMonitorLabeler = new Lang.Class({
 
         this._client = client;
         this._clientWatchId = Gio.bus_watch_name(Gio.BusType.SESSION, client, 0, null,
-                                                 Lang.bind(this, function(c, name) {
+                                                 (c, name) => {
                                                      this.hide(name);
-                                                 }));
+                                                 });
         return true;
     },
 

js/ui/osdWindow.js

@@ -177,10 +177,10 @@ var OsdWindow = new Lang.Class({
                          { opacity: 0,
                            time: FADE_TIME,
                            transition: 'easeOutQuad',
-                           onComplete: Lang.bind(this, function() {
+                           onComplete: () => {
                               this._reset();
                               Meta.enable_unredirect_for_screen(global.screen);
-                           })
+                           }
                          });
         return GLib.SOURCE_REMOVE;
     },

js/ui/overview.js

@@ -62,10 +62,9 @@ var ShellInfo = new Lang.Class({
 
         if (this._source == null) {
             this._source = new MessageTray.SystemNotificationSource();
-            this._source.connect('destroy', Lang.bind(this,
-                function() {
+            this._source.connect('destroy', () => {
                 this._source = null;
-                }));
+            });
             Main.messageTray.add(this._source);
         }
 
@@ -141,7 +140,7 @@ var Overview = new Lang.Class({
         this._coverPane = new Clutter.Actor({ opacity: 0,
                                               reactive: true });
         Main.layoutManager.overviewGroup.add_child(this._coverPane);
-        this._coverPane.connect('event', Lang.bind(this, function (actor, event) { return Clutter.EVENT_STOP; }));
+        this._coverPane.connect('event', () => Clutter.EVENT_STOP);
 
         Main.layoutManager.overviewGroup.add_child(this._overview);
 
@@ -254,10 +253,9 @@ var Overview = new Lang.Class({
 
         // TODO - recalculate everything when desktop size changes
         this.dashIconSize = this._dash.iconSize;
-        this._dash.connect('icon-size-changed',
-                           Lang.bind(this, function() {
+        this._dash.connect('icon-size-changed', () => {
             this.dashIconSize = this._dash.iconSize;
-                           }));
+        });
 
         Main.layoutManager.connect('monitors-changed', Lang.bind(this, this._relayout));
         this._relayout();
@@ -343,7 +341,7 @@ var Overview = new Lang.Class({
         if (targetIsWindow) {
             this._lastHoveredWindow = dragEvent.targetActor._delegate.metaWindow;
             this._windowSwitchTimeoutId = Mainloop.timeout_add(DND_WINDOW_SWITCH_TIMEOUT,
-                                            Lang.bind(this, function() {
+                () => {
                     this._windowSwitchTimeoutId = 0;
                     this._needsFakePointerEvent = true;
                     Main.activateWindow(dragEvent.targetActor._delegate.metaWindow,
@@ -351,7 +349,7 @@ var Overview = new Lang.Class({
                     this.hide();
                     this._lastHoveredWindow = null;
                     return GLib.SOURCE_REMOVE;
-                                            }));
+                });
             GLib.Source.set_name_by_id(this._windowSwitchTimeoutId, '[gnome-shell] Main.activateWindow');
         }
 
@@ -371,18 +369,18 @@ var Overview = new Lang.Class({
     },
 
     _getDesktopClone() {
-        let windows = global.get_window_actors().filter(function(w) {
-            return w.meta_window.get_window_type() == Meta.WindowType.DESKTOP;
-        });
+        let windows = global.get_window_actors().filter(
+            w => w.meta_window.get_window_type() == Meta.WindowType.DESKTOP
+        );
         if (windows.length == 0)
             return null;
 
         let window = windows[0];
         let clone = new Clutter.Clone({ source: window,
                                         x: window.x, y: window.y });
-        clone.source.connect('destroy', Lang.bind(this, function() {
+        clone.source.connect('destroy', () => {
             clone.destroy();
-        }));
+        });
         return clone;
     },
 

js/ui/overviewControls.js

@@ -431,20 +431,17 @@ var ControlsManager = new Lang.Class({
         layout.connect('allocation-changed', Lang.bind(this, this._updateWorkspacesGeometry));
 
         Main.overview.connect('showing', Lang.bind(this, this._updateSpacerVisibility));
-        Main.overview.connect('item-drag-begin', Lang.bind(this,
-            function() {
+        Main.overview.connect('item-drag-begin', () => {
             let activePage = this.viewSelector.getActivePage();
             if (activePage != ViewSelector.ViewPage.WINDOWS)
                 this.viewSelector.fadeHalf();
-            }));
-        Main.overview.connect('item-drag-end', Lang.bind(this,
-            function() {
+        });
+        Main.overview.connect('item-drag-end', () => {
             this.viewSelector.fadeIn();
-            }));
-        Main.overview.connect('item-drag-cancelled', Lang.bind(this,
-            function() {
+        });
+        Main.overview.connect('item-drag-cancelled', () => {
             this.viewSelector.fadeIn();
-            }));
+        });
     },
 
     _updateWorkspacesGeometry() {

js/ui/padOsd.js

@@ -50,7 +50,7 @@ var PadChooser = new Lang.Class({
         this._ensureMenu(groupDevices);
 
         this.actor.connect('destroy', Lang.bind(this, this._onDestroy));
-        this.actor.connect('clicked', Lang.bind(this, function (actor) {
+        this.actor.connect('clicked', actor => {
             if (actor.get_checked()) {
                 if (this._padChooserMenu != null)
                     this._padChooserMenu.open(true);
@@ -59,12 +59,14 @@ var PadChooser = new Lang.Class({
             } else {
                 this._padChooserMenu.close(true);
             }
-        }));
+        });
     },
 
     _ensureMenu(devices) {
         this._padChooserMenu =  new PopupMenu.PopupMenu(this.actor, 0.5, St.Side.TOP);
-        this._padChooserMenu.connect('menu-closed', Lang.bind(this, function() { this.actor.set_checked(false); }));
+        this._padChooserMenu.connect('menu-closed', () => {
+            this.actor.set_checked(false);
+        });
         this._padChooserMenu.actor.hide();
         Main.uiGroup.add_actor(this._padChooserMenu.actor);
 
@@ -144,7 +146,9 @@ var ActionComboBox = new Lang.Class({
         box.add_child(arrow);
 
         this._editMenu = new PopupMenu.PopupMenu(this.actor, 0, St.Side.TOP);
-        this._editMenu.connect('menu-closed', Lang.bind(this, function() { this.actor.set_checked(false); }));
+        this._editMenu.connect('menu-closed', () => {
+            this.actor.set_checked(false);
+        });
         this._editMenu.actor.hide();
         Main.uiGroup.add_actor(this._editMenu.actor);
 
@@ -158,7 +162,9 @@ var ActionComboBox = new Lang.Class({
 
         for (let [action, label] of this._actionLabels.entries()) {
             let selectedAction = action;
-            let item = this._editMenu.addAction(label, Lang.bind(this, function() { this._onActionSelected(selectedAction) }));
+            let item = this._editMenu.addAction(label, () => {
+                this._onActionSelected(selectedAction);
+            });
 
             /* These actions only apply to pad buttons */
             if (selectedAction == GDesktopEnums.PadButtonAction.HELP ||
@@ -632,14 +638,14 @@ var PadOsd = new Lang.Class({
         this._padChooser = null;
 
         let deviceManager = Clutter.DeviceManager.get_default();
-        this._deviceAddedId = deviceManager.connect('device-added', Lang.bind(this, function (manager, device) {
+        this._deviceAddedId = deviceManager.connect('device-added', (manager, device) => {
             if (device.get_device_type() == Clutter.InputDeviceType.PAD_DEVICE &&
                 this.padDevice.is_grouped(device)) {
                 this._groupPads.push(device);
                 this._updatePadChooser();
             }
-        }));
-        this._deviceRemovedId = deviceManager.connect('device-removed', Lang.bind(this, function (manager, device) {
+        });
+        this._deviceRemovedId = deviceManager.connect('device-removed', (manager, device) => {
             // If the device is being removed, destroy the padOsd.
             if (device == this.padDevice) {
                 this.destroy();
@@ -650,14 +656,14 @@ var PadOsd = new Lang.Class({
                 this._updatePadChooser();
 
             }
-        }));
+        });
 
-        deviceManager.list_devices().forEach(Lang.bind(this, function(device) {
+        deviceManager.list_devices().forEach(device => {
             if (device != this.padDevice &&
                 device.get_device_type() == Clutter.InputDeviceType.PAD_DEVICE &&
                 this.padDevice.is_grouped(device))
                 this._groupPads.push(device);
-        }));
+        });
 
         this.actor = new St.BoxLayout({ style_class: 'pad-osd-window',
                                         x_expand: true,
@@ -735,7 +741,9 @@ var PadOsd = new Lang.Class({
                                            style_class: 'button',
                                            x_align: Clutter.ActorAlign.CENTER,
                                            can_focus: true });
-        this._editButton.connect('clicked', Lang.bind(this, function () { this.setEditionMode(true) }));
+        this._editButton.connect('clicked', () => {
+            this.setEditionMode(true);
+        });
         buttonBox.add_actor(this._editButton);
 
         this._syncEditionMode();
@@ -746,9 +754,9 @@ var PadOsd = new Lang.Class({
         if (this._groupPads.length > 1) {
             if (this._padChooser == null) {
                 this._padChooser = new PadChooser(this.padDevice, this._groupPads)
-                this._padChooser.connect('pad-selected', Lang.bind(this, function (chooser, pad) {
+                this._padChooser.connect('pad-selected', (chooser, pad) => {
                     this._requestForOtherPad(pad);
-                }));
+                });
                 this._titleBox.add_child(this._padChooser.actor);
             } else {
                 this._padChooser.update(this._groupPads);
@@ -976,11 +984,11 @@ var PadOsdService = new Lang.Class({
         let devices = deviceManager.list_devices();
         let padDevice = null;
 
-        devices.forEach(Lang.bind(this, function(device) {
+        devices.forEach(device => {
             if (deviceNode == device.get_device_node() &&
                 device.get_device_type() == Clutter.InputDeviceType.PAD_DEVICE)
                 padDevice = device;
-        }));
+        });
 
         if (padDevice == null) {
             invocation.return_error_literal(Gio.IOErrorEnum,

js/ui/panel.js

@@ -240,13 +240,10 @@ var AppMenuButton = new Lang.Class({
 
     _onAppStateChanged(appSys, app) {
         let state = app.state;
-        if (state != Shell.AppState.STARTING) {
-            this._startingApps = this._startingApps.filter(function(a) {
-                return a != app;
-            });
-        } else if (state == Shell.AppState.STARTING) {
+        if (state != Shell.AppState.STARTING)
+            this._startingApps = this._startingApps.filter(a => a != app);
+        else if (state == Shell.AppState.STARTING)
             this._startingApps.push(app);
-        }
         // For now just resync on all running state changes; this is mainly to handle
         // cases where the focused window's application changes without the focus
         // changing.  An example case is how we map OpenOffice.org based on the window
@@ -343,10 +340,10 @@ var AppMenuButton = new Lang.Class({
                 return;
 
             menu = new RemoteMenu.RemoteMenu(this.actor, this._targetApp.menu, this._targetApp.action_group);
-            menu.connect('activate', Lang.bind(this, function() {
+            menu.connect('activate', () => {
                 let win = this._targetApp.get_windows()[0];
                 win.check_alive(global.get_current_time());
-            }));
+            });
 
         } else {
             if (this.menu && this.menu.isDummyQuitMenu)
@@ -355,9 +352,9 @@ var AppMenuButton = new Lang.Class({
             // fallback to older menu
             menu = new PopupMenu.PopupMenu(this.actor, 0.0, St.Side.TOP, 0);
             menu.isDummyQuitMenu = true;
-            menu.addAction(_("Quit"), Lang.bind(this, function() {
+            menu.addAction(_("Quit"), () => {
                 this._targetApp.request_quit();
-            }));
+            });
         }
 
         this.setMenu(menu);
@@ -420,14 +417,14 @@ var ActivitiesButton = new Lang.Class({
         this.actor.connect('captured-event', Lang.bind(this, this._onCapturedEvent));
         this.actor.connect_after('key-release-event', Lang.bind(this, this._onKeyRelease));
 
-        Main.overview.connect('showing', Lang.bind(this, function() {
+        Main.overview.connect('showing', () => {
             this.actor.add_style_pseudo_class('overview');
             this.actor.add_accessible_state (Atk.StateType.CHECKED);
-        }));
-        Main.overview.connect('hiding', Lang.bind(this, function() {
+        });
+        Main.overview.connect('hiding', () => {
             this.actor.remove_style_pseudo_class('overview');
             this.actor.remove_accessible_state (Atk.StateType.CHECKED);
-        }));
+        });
 
         this._xdndTimeOut = 0;
     },
@@ -574,20 +571,19 @@ var PanelCorner = new Lang.Class({
 
             this._button = button;
 
-            button.connect('destroy', Lang.bind(this,
-                function() {
+            button.connect('destroy', () => {
                 if (this._button == button) {
                     this._button = null;
                     this._buttonStyleChangedSignalId = 0;
                 }
-                }));
+            });
 
             // Synchronize the locate button's pseudo classes with this corner
-            this._buttonStyleChangedSignalId = button.connect('style-changed', Lang.bind(this,
-                function(actor) {
+            this._buttonStyleChangedSignalId = button.connect('style-changed',
+                actor => {
                     let pseudoClass = button.get_style_pseudo_class();
                     this.actor.set_style_pseudo_class(pseudoClass);
-                }));
+                });
 
             // The corner doesn't support theme transitions, so override
             // the .panel-button default
@@ -801,14 +797,14 @@ var Panel = new Lang.Class({
         this.actor.connect('button-press-event', Lang.bind(this, this._onButtonPress));
         this.actor.connect('key-press-event', Lang.bind(this, this._onKeyPress));
 
-        Main.overview.connect('showing', Lang.bind(this, function () {
+        Main.overview.connect('showing', () => {
             this.actor.add_style_pseudo_class('overview');
             this._updateSolidStyle();
-        }));
-        Main.overview.connect('hiding', Lang.bind(this, function () {
+        });
+        Main.overview.connect('hiding', () => {
             this.actor.remove_style_pseudo_class('overview');
             this._updateSolidStyle();
-        }));
+        });
 
         Main.layoutManager.panelBox.add(this.actor);
         Main.ctrlAltTabManager.addGroup(this.actor, _("Top Bar"), 'focus-top-bar-symbolic',
@@ -1079,7 +1075,7 @@ var Panel = new Lang.Class({
 
         /* Get all the windows in the active workspace that are in the primary monitor and visible */
         let activeWorkspace = global.screen.get_active_workspace();
-        let windows = activeWorkspace.list_windows().filter(function(metaWindow) {
+        let windows = activeWorkspace.list_windows().filter(metaWindow => {
             return metaWindow.is_on_primary_monitor() &&
                    metaWindow.showing_on_its_workspace() &&
                    metaWindow.get_window_type() != Meta.WindowType.DESKTOP;
@@ -1089,10 +1085,10 @@ var Panel = new Lang.Class({
         let [, panelTop] = this.actor.get_transformed_position();
         let panelBottom = panelTop + this.actor.get_height();
         let scale = St.ThemeContext.get_for_stage(global.stage).scale_factor;
-        let isNearEnough = windows.some(Lang.bind(this, function(metaWindow) {
+        let isNearEnough = windows.some(metaWindow => {
             let verticalPosition = metaWindow.get_frame_rect().y;
             return verticalPosition < panelBottom + 5 * scale;
-        }));
+        });
 
         if (isNearEnough)
             this._addStyleClassName('solid');
@@ -1150,11 +1146,11 @@ var Panel = new Lang.Class({
         if (indicator.menu)
             this.menuManager.addMenu(indicator.menu);
         this.statusArea[role] = indicator;
-        let destroyId = indicator.connect('destroy', Lang.bind(this, function(emitter) {
+        let destroyId = indicator.connect('destroy', emitter => {
             delete this.statusArea[role];
             emitter.disconnect(destroyId);
             container.destroy();
-        }));
+        });
         indicator.connect('menu-set', Lang.bind(this, this._onMenuSet));
         this._onMenuSet(indicator);
     },
@@ -1195,7 +1191,7 @@ var Panel = new Lang.Class({
             return;
 
         indicator.menu._openChangedId = indicator.menu.connect('open-state-changed',
-            Lang.bind(this, function(menu, isOpen) {
+            (menu, isOpen) => {
                 let boxAlignment;
                 if (this._leftBox.contains(indicator.container))
                     boxAlignment = Clutter.ActorAlign.START;
@@ -1206,6 +1202,6 @@ var Panel = new Lang.Class({
 
                 if (boxAlignment == Main.messageTray.bannerAlignment)
                     Main.messageTray.bannerBlocked = isOpen;
-            }));
+            });
     }
 });

js/ui/panelMenu.js

@@ -214,9 +214,7 @@ var SystemIndicator = new Lang.Class({
     },
 
     _syncIndicatorsVisible() {
-        this.indicators.visible = this.indicators.get_children().some(function(actor) {
-            return actor.visible;
-        });
+        this.indicators.visible = this.indicators.get_children().some(a => a.visible);
     },
 
     _addIndicator() {

js/ui/popupMenu.js

@@ -476,15 +476,15 @@ var PopupMenuBase = new Lang.Class({
             menuItem = new PopupMenuItem(title);
 
         this.addMenuItem(menuItem);
-        menuItem.connect('activate', Lang.bind(this, function (menuItem, event) {
+        menuItem.connect('activate', (menuItem, event) => {
             callback(event);
-        }));
+        });
 
         return menuItem;
     },
 
     addSettingsAction(title, desktopFile) {
-        let menuItem = this.addAction(title, function() {
+        let menuItem = this.addAction(title, () => {
             let app = Shell.AppSystem.get_default().lookup_app(desktopFile);
 
             if (!app) {
@@ -510,7 +510,7 @@ var PopupMenuBase = new Lang.Class({
     },
 
     isEmpty() {
-        let hasVisibleChildren = this.box.get_children().some(function(child) {
+        let hasVisibleChildren = this.box.get_children().some(child => {
             if (child._delegate instanceof PopupSeparatorMenuItem)
                 return false;
             return isPopupMenuItemVisible(child);
@@ -534,7 +534,7 @@ var PopupMenuBase = new Lang.Class({
     },
 
     _connectItemSignals(menuItem) {
-        menuItem._activeChangeId = menuItem.connect('active-changed', Lang.bind(this, function (menuItem, active) {
+        menuItem._activeChangeId = menuItem.connect('active-changed', (menuItem, active) => {
             if (active && this._activeMenuItem != menuItem) {
                 if (this._activeMenuItem)
                     this._activeMenuItem.setActive(false);
@@ -544,8 +544,8 @@ var PopupMenuBase = new Lang.Class({
                 this._activeMenuItem = null;
                 this.emit('active-changed', null);
             }
-        }));
-        menuItem._sensitiveChangeId = menuItem.connect('sensitive-changed', Lang.bind(this, function() {
+        });
+        menuItem._sensitiveChangeId = menuItem.connect('sensitive-changed', () => {
             let sensitive = menuItem.getSensitive();
             if (!sensitive && this._activeMenuItem == menuItem) {
                 if (!this.actor.navigate_focus(menuItem.actor,
@@ -556,21 +556,21 @@ var PopupMenuBase = new Lang.Class({
                 if (global.stage.get_key_focus() == this.actor)
                     menuItem.actor.grab_key_focus();
             }
-        }));
-        menuItem._activateId = menuItem.connect('activate', Lang.bind(this, function (menuItem, event) {
+        });
+        menuItem._activateId = menuItem.connect('activate', (menuItem, event) => {
             this.emit('activate', menuItem);
             this.itemActivated(BoxPointer.PopupAnimation.FULL);
-        }));
+        });
 
-        menuItem._parentSensitiveChangeId = this.connect('sensitive-changed', Lang.bind(this, function() {
+        menuItem._parentSensitiveChangeId = this.connect('sensitive-changed', () => {
             menuItem.syncSensitive();
-        }));
+        });
 
         // the weird name is to avoid a conflict with some random property
         // the menuItem may have, called destroyId
         // (FIXME: in the future it may make sense to have container objects
         // like PopupMenuManager does)
-        menuItem._popupMenuDestroyId = menuItem.connect('destroy', Lang.bind(this, function(menuItem) {
+        menuItem._popupMenuDestroyId = menuItem.connect('destroy', menuItem => {
             menuItem.disconnect(menuItem._popupMenuDestroyId);
             menuItem.disconnect(menuItem._activateId);
             menuItem.disconnect(menuItem._activeChangeId);
@@ -578,7 +578,7 @@ var PopupMenuBase = new Lang.Class({
             this.disconnect(menuItem._parentSensitiveChangeId);
             if (menuItem == this._activeMenuItem)
                 this._activeMenuItem = null;
-        }));
+        });
     },
 
     _updateSeparatorVisibility(menuItem) {
@@ -652,26 +652,26 @@ var PopupMenuBase = new Lang.Class({
         if (menuItem instanceof PopupMenuSection) {
             let activeChangeId = menuItem.connect('active-changed', Lang.bind(this, this._subMenuActiveChanged));
 
-            let parentOpenStateChangedId = this.connect('open-state-changed', function(self, open) {
+            let parentOpenStateChangedId = this.connect('open-state-changed', (self, open) => {
                 if (open)
                     menuItem.open();
                 else
                     menuItem.close();
             });
-            let parentClosingId = this.connect('menu-closed', function() {
+            let parentClosingId = this.connect('menu-closed', () => {
                 menuItem.emit('menu-closed');
             });
-            let subMenuSensitiveChangedId = this.connect('sensitive-changed', Lang.bind(this, function() {
+            let subMenuSensitiveChangedId = this.connect('sensitive-changed', () => {
                 menuItem.emit('sensitive-changed');
-            }));
+            });
 
-            menuItem.connect('destroy', Lang.bind(this, function() {
+            menuItem.connect('destroy', () => {
                 menuItem.disconnect(activeChangeId);
                 this.disconnect(subMenuSensitiveChangedId);
                 this.disconnect(parentOpenStateChangedId);
                 this.disconnect(parentClosingId);
                 this.length--;
-            }));
+            });
         } else if (menuItem instanceof PopupSubMenuMenuItem) {
             if (before_item == null)
                 this.box.add(menuItem.menu.actor);
@@ -680,14 +680,14 @@ var PopupMenuBase = new Lang.Class({
 
             this._connectItemSignals(menuItem);
             let subMenuActiveChangeId = menuItem.menu.connect('active-changed', Lang.bind(this, this._subMenuActiveChanged));
-            let closingId = this.connect('menu-closed', function() {
+            let closingId = this.connect('menu-closed', () => {
                 menuItem.menu.close(BoxPointer.PopupAnimation.NONE);
             });
 
-            menuItem.connect('destroy', Lang.bind(this, function() {
+            menuItem.connect('destroy', () => {
                 menuItem.menu.disconnect(subMenuActiveChangeId);
                 this.disconnect(closingId);
-            }));
+            });
         } else if (menuItem instanceof PopupSeparatorMenuItem) {
             this._connectItemSignals(menuItem);
 
@@ -695,11 +695,13 @@ var PopupMenuBase = new Lang.Class({
             // separator's adjacent siblings change visibility or position.
             // open-state-changed isn't exactly that, but doing it in more
             // precise ways would require a lot more bookkeeping.
-            let openStateChangeId = this.connect('open-state-changed', Lang.bind(this, function() { this._updateSeparatorVisibility(menuItem); }));
-            let destroyId = menuItem.connect('destroy', Lang.bind(this, function() {
+            let openStateChangeId = this.connect('open-state-changed', () => {
+                this._updateSeparatorVisibility(menuItem);
+            });
+            let destroyId = menuItem.connect('destroy', () => {
                 this.disconnect(openStateChangeId);
                 menuItem.disconnect(destroyId);
-            }));
+            });
         } else if (menuItem instanceof PopupBaseMenuItem)
             this._connectItemSignals(menuItem);
         else
@@ -711,9 +713,7 @@ var PopupMenuBase = new Lang.Class({
     },
 
     _getMenuItems() {
-        return this.box.get_children().map(function (actor) {
-            return actor._delegate;
-        }).filter(function(item) {
+        return this.box.get_children().map(a => a._delegate).filter(item => {
             return item instanceof PopupBaseMenuItem || item instanceof PopupMenuSection;
         });
     },
@@ -875,9 +875,9 @@ var PopupMenu = new Lang.Class({
             this._activeMenuItem.setActive(false);
 
         if (this._boxPointer.actor.visible) {
-            this._boxPointer.hide(animate, Lang.bind(this, function() {
+            this._boxPointer.hide(animate, () => {
                 this.emit('menu-closed');
-            }));
+            });
         }
 
         if (!this.isOpen)
@@ -1234,8 +1234,11 @@ var PopupMenuManager = new Lang.Class({
         if (source) {
             if (!menu.blockSourceEvents)
                 this._grabHelper.addActor(source);
-            menudata.enterId = source.connect('enter-event', Lang.bind(this, function() { return this._onMenuSourceEnter(menu); }));
-            menudata.focusInId = source.connect('key-focus-in', Lang.bind(this, function() { this._onMenuSourceEnter(menu); }));
+            menudata.enterId = source.connect('enter-event',
+                () => this._onMenuSourceEnter(menu));
+            menudata.focusInId = source.connect('key-focus-in', () => {
+                this._onMenuSourceEnter(menu);
+            });
         }
 
         if (position == undefined)

js/ui/remoteMenu.js

@@ -47,7 +47,7 @@ var RemoteMenuSeparatorItemMapper = new Lang.Class({
         this._trackerItem.connect('notify::label', Lang.bind(this, this._updateLabel));
         this._updateLabel();
 
-        this.menuItem.connect('destroy', function() {
+        this.menuItem.connect('destroy', () => {
             trackerItem.run_dispose();
         });
     },
@@ -89,15 +89,15 @@ var RemoteMenuSubmenuItemMapper = new Lang.Class({
                                                                _insertItem.bind(null, this.menuItem.menu),
                                                                _removeItem.bind(null, this.menuItem.menu));
 
-        this.menuItem.connect('request-open', Lang.bind(this, function(menu, open) {
+        this.menuItem.connect('request-open', (menu, open) => {
             this._trackerItem.request_submenu_shown(open);
-        }));
+        });
 
-        this._trackerItem.connect('notify::submenu-shown', Lang.bind(this, function() {
+        this._trackerItem.connect('notify::submenu-shown', () => {
             this.menuItem.setSubmenuShown(this._trackerItem.get_submenu_shown());
-        }));
+        });
 
-        this.menuItem.connect('destroy', function() {
+        this.menuItem.connect('destroy', () => {
             trackerItem.run_dispose();
         });
     },
@@ -123,9 +123,9 @@ var RemoteMenuItemMapper = new Lang.Class({
         this.menuItem.actor.add_child(this._label);
         this.menuItem.actor.label_actor = this._label;
 
-        this.menuItem.connect('activate', Lang.bind(this, function() {
+        this.menuItem.connect('activate', () => {
             this._trackerItem.activated();
-        }));
+        });
 
         this._trackerItem.bind_property('visible', this.menuItem.actor, 'visible', GObject.BindingFlags.SYNC_CREATE);
 
@@ -138,7 +138,7 @@ var RemoteMenuItemMapper = new Lang.Class({
         this._updateSensitivity();
         this._updateRole();
 
-        this.menuItem.connect('destroy', function() {
+        this.menuItem.connect('destroy', () => {
             trackerItem.run_dispose();
         });
     },

js/ui/remoteSearch.js

@@ -143,7 +143,7 @@ function loadRemoteSearchProviders(searchSettings, callback) {
     // Special case gnome-control-center to be always active and always first
     sortOrder.unshift('gnome-control-center.desktop');
 
-    loadedProviders = loadedProviders.filter(function(provider) {
+    loadedProviders = loadedProviders.filter(provider => {
         let appId = provider.appInfo.get_id();
 
         if (provider.defaultEnabled) {
@@ -155,7 +155,7 @@ function loadRemoteSearchProviders(searchSettings, callback) {
         }
     });
 
-    loadedProviders.sort(function(providerA, providerB) {
+    loadedProviders.sort((providerA, providerB) => {
         let idxA, idxB;
         let appIdA, appIdB;
 
@@ -240,8 +240,8 @@ var RemoteSearchProvider = new Lang.Class({
         if (results.length <= maxNumber)
             return results;
 
-        let regularResults = results.filter(function(r) { return !r.startsWith('special:'); });
-        let specialResults = results.filter(function(r) { return r.startsWith('special:'); });
+        let regularResults = results.filter(r => !r.startsWith('special:'));
+        let specialResults = results.filter(r => r.startsWith('special:'));
 
         return regularResults.slice(0, maxNumber).concat(specialResults.slice(0, maxNumber));
     },

js/ui/runDialog.js

@@ -40,30 +40,29 @@ var RunDialog = new Lang.Class({
 
         this._lockdownSettings = new Gio.Settings({ schema_id: LOCKDOWN_SCHEMA });
         this._terminalSettings = new Gio.Settings({ schema_id: TERMINAL_SCHEMA });
-        global.settings.connect('changed::development-tools', Lang.bind(this, function () {
+        global.settings.connect('changed::development-tools', () => {
             this._enableInternalCommands = global.settings.get_boolean('development-tools');
-        }));
+        });
         this._enableInternalCommands = global.settings.get_boolean('development-tools');
 
-        this._internalCommands = { 'lg':
-                                   Lang.bind(this, function() {
+        this._internalCommands = { 'lg': () => {
                                        Main.createLookingGlass().open();
-                                   }),
+                                   },
 
                                    'r': Lang.bind(this, this._restart),
 
                                    // Developer brain backwards compatibility
                                    'restart': Lang.bind(this, this._restart),
 
-                                   'debugexit': Lang.bind(this, function() {
+                                   'debugexit': () => {
                                        Meta.quit(Meta.ExitCode.ERROR);
-                                   }),
+                                   },
 
                                    // rt is short for "reload theme"
-                                   'rt': Lang.bind(this, function() {
+                                   'rt': () => {
                                        Main.reloadThemeResource();
                                        Main.loadTheme();
-                                   })
+                                   }
                                  };
 
 
@@ -115,7 +114,7 @@ var RunDialog = new Lang.Class({
 
         this._history = new History.HistoryManager({ gsettingsKey: HISTORY_KEY,
                                                      entry: this._entryText });
-        this._entryText.connect('key-press-event', Lang.bind(this, function(o, e) {
+        this._entryText.connect('key-press-event', (o, e) => {
             let symbol = e.get_key_symbol();
             if (symbol == Clutter.Return || symbol == Clutter.KP_Enter) {
                 this.popModal();
@@ -142,7 +141,7 @@ var RunDialog = new Lang.Class({
                 return Clutter.EVENT_STOP;
             }
             return Clutter.EVENT_PROPAGATE;
-        }));
+        });
     },
 
     _getCommandCompletion(text) {
@@ -162,7 +161,7 @@ var RunDialog = new Lang.Class({
 
         let paths = GLib.getenv('PATH').split(':');
         paths.push(GLib.get_home_dir());
-        let someResults = paths.map(function(path) {
+        let someResults = paths.map(path => {
             let results = [];
             try {
                 let file = Gio.File.new_for_path(path);
@@ -180,9 +179,7 @@ var RunDialog = new Lang.Class({
                 return results;
             }
         });
-        let results = someResults.reduce(function(a, b) {
-            return a.concat(b);
-        }, []);
+        let results = someResults.reduce((a, b) => a.concat(b), []);
 
         if (!results.length)
             return null;
@@ -263,11 +260,10 @@ var RunDialog = new Lang.Class({
                              { height: parentActor.height + errorBoxNaturalHeight,
                                time: DIALOG_GROW_TIME,
                                transition: 'easeOutQuad',
-                               onComplete: Lang.bind(this,
-                                                     function() {
+                               onComplete: () => {
                                    parentActor.set_height(-1);
                                    this._errorBox.show();
-                                                     })
+                               }
                              });
         }
     },

js/ui/screenShield.js

@@ -112,9 +112,9 @@ var NotificationsBox = new Lang.Class({
         this.actor.add(this._scrollView, { x_fill: true, x_align: St.Align.START });
 
         this._sources = new Map();
-        Main.messageTray.getSources().forEach(Lang.bind(this, function(source) {
+        Main.messageTray.getSources().forEach(source => {
             this._sourceAdded(Main.messageTray, source, true);
-        }));
+        });
         this._updateVisibility();
 
         this._sourceAddedId = Main.messageTray.connect('source-added', Lang.bind(this, this._sourceAdded));
@@ -135,9 +135,8 @@ var NotificationsBox = new Lang.Class({
     },
 
     _updateVisibility() {
-        this._notificationBox.visible = this._notificationBox.get_children().some(function(a) {
-            return a.visible;
-        });
+        this._notificationBox.visible =
+            this._notificationBox.get_children().some(a => a.visible);
 
         this.actor.visible = this._notificationBox.visible;
     },
@@ -235,21 +234,21 @@ var NotificationsBox = new Lang.Class({
         this._showSource(source, obj, obj.sourceBox);
         this._notificationBox.add(obj.sourceBox, { x_fill: false, x_align: St.Align.START });
 
-        obj.sourceCountChangedId = source.connect('count-updated', Lang.bind(this, function(source) {
+        obj.sourceCountChangedId = source.connect('count-updated', source => {
             this._countChanged(source, obj);
-        }));
-        obj.sourceTitleChangedId = source.connect('title-changed', Lang.bind(this, function(source) {
+        });
+        obj.sourceTitleChangedId = source.connect('title-changed', source => {
             this._titleChanged(source, obj);
-        }));
-        obj.policyChangedId = source.policy.connect('policy-changed', Lang.bind(this, function(policy, key) {
+        });
+        obj.policyChangedId = source.policy.connect('policy-changed', (policy, key) => {
             if (key == 'show-in-lock-screen')
                 this._visibleChanged(source, obj);
             else
                 this._detailedChanged(source, obj);
-        }));
-        obj.sourceDestroyId = source.connect('destroy', Lang.bind(this, function(source) {
+        });
+        obj.sourceDestroyId = source.connect('destroy', source => {
             this._onSourceDestroy(source, obj);
-        }));
+        });
 
         this._sources.set(source, obj);
 
@@ -499,47 +498,48 @@ var ScreenShield = new Lang.Class({
         this.actor.add_actor(this._lockDialogGroup);
         this.actor.add_actor(this._lockScreenGroup);
 
-        this._presence = new GnomeSession.Presence(Lang.bind(this, function(proxy, error) {
+        this._presence = new GnomeSession.Presence((proxy, error) => {
             if (error) {
                 logError(error, 'Error while reading gnome-session presence');
                 return;
             }
 
             this._onStatusChanged(proxy.status);
-        }));
-        this._presence.connectSignal('StatusChanged', Lang.bind(this, function(proxy, senderName, [status]) {
+        });
+        this._presence.connectSignal('StatusChanged', (proxy, senderName, [status]) => {
             this._onStatusChanged(status);
-        }));
+        });
 
         this._screenSaverDBus = new ShellDBus.ScreenSaverDBus(this);
 
         this._smartcardManager = SmartcardManager.getSmartcardManager();
         this._smartcardManager.connect('smartcard-inserted',
-                                       Lang.bind(this, function(manager, token) {
+                                       (manager, token) => {
                                            if (this._isLocked && token.UsedToLogin)
                                                this._liftShield(true, 0);
-                                       }));
+                                       });
 
         this._oVirtCredentialsManager = OVirt.getOVirtCredentialsManager();
         this._oVirtCredentialsManager.connect('user-authenticated',
-                                              Lang.bind(this, function() {
+                                              () => {
                                                   if (this._isLocked)
                                                       this._liftShield(true, 0);
-                                              }));
+                                              });
 
         this._loginManager = LoginManager.getLoginManager();
         this._loginManager.connect('prepare-for-sleep',
                                    Lang.bind(this, this._prepareForSleep));
 
         this._loginSession = null;
-        this._loginManager.getCurrentSessionProxy(Lang.bind(this,
-            function(sessionProxy) {
+        this._loginManager.getCurrentSessionProxy(sessionProxy => {
             this._loginSession = sessionProxy;
-                this._loginSession.connectSignal('Lock', Lang.bind(this, function() { this.lock(false); }));
-                this._loginSession.connectSignal('Unlock', Lang.bind(this, function() { this.deactivate(false); }));
+            this._loginSession.connectSignal('Lock',
+                                             () => { this.lock(false); });
+            this._loginSession.connectSignal('Unlock',
+                                             () => { this.deactivate(false); });
             this._loginSession.connect('g-properties-changed', Lang.bind(this, this._syncInhibitor));
             this._syncInhibitor();
-            }));
+        });
 
         this._settings = new Gio.Settings({ schema_id: SCREENSAVER_SCHEMA });
         this._settings.connect('changed::' + LOCK_ENABLED_KEY, Lang.bind(this, this._syncInhibitor));
@@ -713,11 +713,11 @@ var ScreenShield = new Lang.Class({
                        !this._isActive && lockEnabled && !lockLocked);
         if (inhibit) {
             this._loginManager.inhibit(_("GNOME needs to lock the screen"),
-                                       Lang.bind(this, function(inhibitor) {
+                inhibitor => {
                     if (this._inhibitor)
                         this._inhibitor.close(null);
                     this._inhibitor = inhibitor;
-                                       }));
+                });
         } else {
             if (this._inhibitor)
                 this._inhibitor.close(null);
@@ -846,11 +846,11 @@ var ScreenShield = new Lang.Class({
         if (shouldLock) {
             let lockTimeout = Math.max(STANDARD_FADE_TIME, this._settings.get_uint(LOCK_DELAY_KEY));
             this._lockTimeoutId = Mainloop.timeout_add(lockTimeout * 1000,
-                                                       Lang.bind(this, function() {
+                                                       () => {
                                                            this._lockTimeoutId = 0;
                                                            this.lock(false);
                                                            return GLib.SOURCE_REMOVE;
-                                                       }));
+                                                       });
             GLib.Source.set_name_by_id(this._lockTimeoutId, '[gnome-shell] this.lock');
         }
 
@@ -1094,14 +1094,14 @@ var ScreenShield = new Lang.Class({
 
         this._checkArrowAnimation();
 
-        let motionId = global.stage.connect('captured-event', Lang.bind(this, function(stage, event) {
+        let motionId = global.stage.connect('captured-event', (stage, event) => {
             if (event.type() == Clutter.EventType.MOTION) {
                 this._cursorTracker.set_pointer_visible(true);
                 global.stage.disconnect(motionId);
             }
 
             return Clutter.EVENT_PROPAGATE;
-        }));
+        });
         this._cursorTracker.set_pointer_visible(false);
 
         this._lockScreenState = MessageTray.State.SHOWN;
@@ -1111,10 +1111,10 @@ var ScreenShield = new Lang.Class({
         if (params.fadeToBlack && params.animateFade) {
             // Take a beat
 
-            let id = Mainloop.timeout_add(1000 * MANUAL_FADE_TIME, Lang.bind(this, function() {
+            let id = Mainloop.timeout_add(1000 * MANUAL_FADE_TIME, () => {
                 this._activateFade(this._shortLightbox, MANUAL_FADE_TIME);
                 return GLib.SOURCE_REMOVE;
-            }));
+            });
             GLib.Source.set_name_by_id(id, '[gnome-shell] this._activateFade');
         } else {
             if (params.fadeToBlack)
@@ -1192,9 +1192,7 @@ var ScreenShield = new Lang.Class({
 
     deactivate(animate) {
         if (this._dialog)
-            this._dialog.finish(Lang.bind(this, function() {
-                this._continueDeactivate(animate);
-            }));
+            this._dialog.finish(() => { this._continueDeactivate(animate); });
         else
             this._continueDeactivate(animate);
     },
@@ -1339,9 +1337,9 @@ var ScreenShield = new Lang.Class({
         let wasLocked = global.get_runtime_state('b', LOCKED_STATE_STR);
         if (wasLocked === null)
             return;
-        Meta.later_add(Meta.LaterType.BEFORE_REDRAW, Lang.bind(this, function() {
+        Meta.later_add(Meta.LaterType.BEFORE_REDRAW, () => {
             this.lock(false);
-        }));
+        });
     }
 });
 Signals.addSignalMethods(ScreenShield.prototype);

js/ui/screenshot.js

@@ -114,9 +114,9 @@ var ScreenshotService = new Lang.Class({
         if (result) {
             if (flash) {
                 let flashspot = new Flashspot(area);
-                flashspot.fire(Lang.bind(this, function() {
+                flashspot.fire(() => {
                     this._removeShooterForSender(invocation.get_sender());
-                }));
+                });
             }
             else
                 this._removeShooterForSender(invocation.get_sender());
@@ -184,8 +184,7 @@ var ScreenshotService = new Lang.Class({
     SelectAreaAsync(params, invocation) {
         let selectArea = new SelectArea();
         selectArea.show();
-        selectArea.connect('finished', Lang.bind(this,
-            function(selectArea, areaRectangle) {
+        selectArea.connect('finished', (selectArea, areaRectangle) => {
             if (areaRectangle) {
                 let retRectangle = this._unscaleArea(areaRectangle.x, areaRectangle.y,
                     areaRectangle.width, areaRectangle.height);
@@ -195,7 +194,7 @@ var ScreenshotService = new Lang.Class({
                 invocation.return_error_literal(Gio.IOErrorEnum, Gio.IOErrorEnum.CANCELLED,
                     "Operation was cancelled");
             }
-            }));
+        });
     },
 
     FlashAreaAsync(params, invocation) {
@@ -317,10 +316,9 @@ var SelectArea = new Lang.Class({
                          { opacity: 0,
                            time: 0.2,
                            transition: 'easeOutQuad',
-                           onComplete: Lang.bind(this,
-                               function() {
+                           onComplete: () => {
                                this._grabHelper.ungrab();
-                               })
+                           }
                          });
         return Clutter.EVENT_PROPAGATE;
     },
@@ -329,11 +327,10 @@ var SelectArea = new Lang.Class({
         global.screen.set_cursor(Meta.Cursor.DEFAULT);
         this.emit('finished', this._result);
 
-        GLib.idle_add(GLib.PRIORITY_DEFAULT, Lang.bind(this,
-            function() {
+        GLib.idle_add(GLib.PRIORITY_DEFAULT, () => {
             this._group.destroy();
             return GLib.SOURCE_REMOVE;
-            }));
+        });
     }
 });
 Signals.addSignalMethods(SelectArea.prototype);
@@ -360,11 +357,11 @@ var Flashspot = new Lang.Class({
                          { opacity: 0,
                            time: FLASHSPOT_ANIMATION_OUT_TIME,
                            transition: 'easeOutQuad',
-                           onComplete: Lang.bind(this, function() {
+                           onComplete: () => {
                                if (doneCallback)
                                    doneCallback();
                                this.destroy();
-                           })
+                           }
                          });
     }
 });

js/ui/scripting.js

@@ -40,16 +40,14 @@ const Params = imports.misc.params;
 function sleep(milliseconds) {
     let cb;
 
-    let id = Mainloop.timeout_add(milliseconds, function() {
+    let id = Mainloop.timeout_add(milliseconds, () => {
         if (cb)
             cb();
         return GLib.SOURCE_REMOVE;
     });
     GLib.Source.set_name_by_id(id, '[gnome-shell] sleep');
 
-    return function(callback) {
-        cb = callback;
-    };
+    return callback => { cb = callback; };
 }
 
 /**
@@ -62,14 +60,12 @@ function sleep(milliseconds) {
 function waitLeisure() {
     let cb;
 
-    global.run_at_leisure(function() {
+    global.run_at_leisure(() => {
        if (cb)
            cb();
     });
 
-    return function(callback) {
-        cb = callback;
-    };
+    return callback => { cb = callback; };
 }
 
 const PerfHelperIface = '<node> \
@@ -103,7 +99,7 @@ function _callRemote(obj, method, ...args) {
     let cb;
     let errcb;
 
-    args.push(function(result, excp) {
+    args.push((result, excp) => {
          if (excp) {
              if (errcb)
                  errcb(excp);
@@ -115,7 +111,7 @@ function _callRemote(obj, method, ...args) {
 
     method.apply(obj, args);
 
-    return function(callback, error_callback) {
+    return (callback, error_callback) => {
         cb = callback;
         errcb = error_callback;
     };
@@ -213,10 +209,10 @@ function collectStatistics() {
 function _step(g, finish, onError) {
     try {
         let waitFunction = g.next();
-        waitFunction(function() {
+        waitFunction(() => {
                          _step(g, finish, onError);
                      },
-                     function(err) {
+                     err => {
                          if (onError)
                              onError(err);
                      });
@@ -239,7 +235,7 @@ function _collect(scriptModule, outputFile) {
     }
 
     Shell.PerfLog.get_default().replay(
-        function(time, eventName, signature, arg) {
+        (time, eventName, signature, arg) => {
             if (eventName in eventHandlers)
                 eventHandlers[eventName](time, arg);
         });
@@ -370,7 +366,7 @@ function runPerfScript(scriptModule, outputFile) {
     let g = scriptModule.run();
 
     _step(g,
-          function() {
+          () => {
               try {
                   _collect(scriptModule, outputFile);
               } catch (err) {
@@ -379,7 +375,7 @@ function runPerfScript(scriptModule, outputFile) {
               }
               Meta.exit(Meta.ExitCode.SUCCESS);
           },
-         function(err) {
+         err => {
              log("Script failed: " + err + "\n" + err.stack);
              Meta.exit(Meta.ExitCode.ERROR);
          });

js/ui/search.js

@@ -214,9 +214,9 @@ var SearchResultsBase = new Lang.Class({
     },
 
     _ensureResultActors(results, callback) {
-        let metasNeeded = results.filter(Lang.bind(this, function(resultId) {
-            return this._resultDisplays[resultId] === undefined;
-        }));
+        let metasNeeded = results.filter(
+            resultId => this._resultDisplays[resultId] === undefined
+        );
 
         if (metasNeeded.length === 0) {
             callback(true);
@@ -224,30 +224,28 @@ var SearchResultsBase = new Lang.Class({
             this._cancellable.cancel();
             this._cancellable.reset();
 
-            this.provider.getResultMetas(metasNeeded, Lang.bind(this, function(metas) {
+            this.provider.getResultMetas(metasNeeded, metas => {
                 if (metas.length != metasNeeded.length) {
                     log('Wrong number of result metas returned by search provider ' + this.provider.id +
                         ': expected ' + metasNeeded.length + ' but got ' + metas.length);
                     callback(false);
                     return;
                 }
-                if (metas.some(function(meta) {
-                    return !meta.name || !meta.id;
-                })) {
+                if (metas.some(meta => !meta.name || !meta.id)) {
                     log('Invalid result meta returned from search provider ' + this.provider.id);
                     callback(false);
                     return;
                 }
 
-                metasNeeded.forEach(Lang.bind(this, function(resultId, i) {
+                metasNeeded.forEach((resultId, i) => {
                     let meta = metas[i];
                     let display = this._createResultDisplay(meta);
                     display.connect('activate', Lang.bind(this, this._activateResult));
                     display.actor.connect('key-focus-in', Lang.bind(this, this._keyFocusIn));
                     this._resultDisplays[resultId] = display;
-                }));
+                });
                 callback(true);
-            }), this._cancellable);
+            }, this._cancellable);
         }
     },
 
@@ -262,7 +260,7 @@ var SearchResultsBase = new Lang.Class({
             let results = this.provider.filterResults(providerResults, maxResults);
             let moreCount = Math.max(providerResults.length - results.length, 0);
 
-            this._ensureResultActors(results, Lang.bind(this, function(successful) {
+            this._ensureResultActors(results, successful => {
                 if (!successful) {
                     this._clearResultDisplay();
                     callback();
@@ -274,13 +272,13 @@ var SearchResultsBase = new Lang.Class({
                 // content while filling in the results.
                 this.actor.hide();
                 this._clearResultDisplay();
-                results.forEach(Lang.bind(this, function(resultId) {
+                results.forEach(resultId => {
                     this._addItem(this._resultDisplays[resultId]);
-                }));
+                });
                 this._setMoreCount(this.provider.canLaunchSearch ? moreCount : 0);
                 this.actor.show();
                 callback();
-            }));
+            });
         }
     }
 });
@@ -295,12 +293,11 @@ var ListSearchResults = new Lang.Class({
         this._container = new St.BoxLayout({ style_class: 'search-section-content' });
         this.providerInfo = new ProviderInfo(provider);
         this.providerInfo.connect('key-focus-in', Lang.bind(this, this._keyFocusIn));
-        this.providerInfo.connect('clicked', Lang.bind(this,
-            function() {
+        this.providerInfo.connect('clicked', () => {
             this.providerInfo.animateLaunch();
             provider.launchSearch(this._terms);
             Main.overview.toggle();
-            }));
+        });
 
         this._container.add(this.providerInfo, { x_fill: false,
                                                  y_fill: false,
@@ -457,16 +454,14 @@ var SearchResults = new Lang.Class({
     },
 
     _reloadRemoteProviders() {
-        let remoteProviders = this._providers.filter(function(provider) {
-            return provider.isRemoteProvider;
-        });
-        remoteProviders.forEach(Lang.bind(this, function(provider) {
+        let remoteProviders = this._providers.filter(p => p.isRemoteProvider);
+        remoteProviders.forEach(provider => {
             this._unregisterProvider(provider);
-        }));
+        });
 
-        RemoteSearch.loadRemoteSearchProviders(this._searchSettings, Lang.bind(this, function(providers) {
+        RemoteSearch.loadRemoteSearchProviders(this._searchSettings, providers => {
             providers.forEach(Lang.bind(this, this._registerProvider));
-        }));
+        });
     },
 
     _registerProvider(provider) {
@@ -511,7 +506,7 @@ var SearchResults = new Lang.Class({
         let previousResults = this._results;
         this._results = {};
 
-        this._providers.forEach(Lang.bind(this, function(provider) {
+        this._providers.forEach(provider => {
             provider.searchInProgress = true;
 
             let previousProviderResults = previousResults[provider.id];
@@ -519,7 +514,7 @@ var SearchResults = new Lang.Class({
                 provider.getSubsearchResultSet(previousProviderResults, this._terms, Lang.bind(this, this._gotResults, provider), this._cancellable);
             else
                 provider.getInitialResultSet(this._terms, Lang.bind(this, this._gotResults, provider), this._cancellable);
-        }));
+        });
 
         this._updateSearchProgress();
 
@@ -597,7 +592,7 @@ var SearchResults = new Lang.Class({
     },
 
     _clearDisplay() {
-        this._providers.forEach(function(provider) {
+        this._providers.forEach(provider => {
             provider.display.clear();
         });
     },
@@ -632,13 +627,11 @@ var SearchResults = new Lang.Class({
         if (this._startingSearch)
             return true;
 
-        return this._providers.some(function(provider) {
-            return provider.searchInProgress;
-        });
+        return this._providers.some(p => p.searchInProgress);
     },
 
     _updateSearchProgress() {
-        let haveResults = this._providers.some(function(provider) {
+        let haveResults = this._providers.some(provider => {
             let display = provider.display;
             return (display.getFirstResult() != null);
         });
@@ -659,12 +652,12 @@ var SearchResults = new Lang.Class({
         let terms = this._terms;
         let display = provider.display;
 
-        display.updateSearch(results, terms, Lang.bind(this, function() {
+        display.updateSearch(results, terms, () => {
             provider.searchInProgress = false;
 
             this._maybeSetInitialSelection();
             this._updateSearchProgress();
-        }));
+        });
     },
 
     activateDefault() {

js/ui/sessionMode.js

@@ -138,7 +138,7 @@ function _loadModes() {
 
 function listModes() {
     _loadModes();
-    let id = Mainloop.idle_add(function() {
+    let id = Mainloop.idle_add(() => {
         let names = Object.getOwnPropertyNames(_modes);
         for (let i = 0; i < names.length; i++)
             if (_modes[names[i]].isPrimary)

js/ui/shellDBus.js

@@ -92,10 +92,10 @@ var GnomeShell = new Lang.Class({
         this._grabbedAccelerators = new Map();
         this._grabbers = new Map();
 
-        global.display.connect('accelerator-activated', Lang.bind(this,
-            function(display, action, deviceid, timestamp) {
+        global.display.connect('accelerator-activated',
+            (display, action, deviceid, timestamp) => {
                 this._emitAcceleratorActivated(action, deviceid, timestamp);
-            }));
+            });
 
         this._cachedOverviewVisible = false;
         Main.overview.connect('showing',
@@ -357,7 +357,7 @@ var GnomeShellExtensions = new Lang.Class({
         // Only serialize the properties that we actually need.
         const serializedProperties = ["type", "state", "path", "error", "hasPrefs"];
 
-        serializedProperties.forEach(function(prop) {
+        serializedProperties.forEach(prop => {
             obj[prop] = extension[prop];
         });
 
@@ -439,12 +439,12 @@ var ScreenSaverDBus = new Lang.Class({
         this.parent();
 
         this._screenShield = screenShield;
-        screenShield.connect('active-changed', Lang.bind(this, function(shield) {
+        screenShield.connect('active-changed', shield => {
             this._dbusImpl.emit_signal('ActiveChanged', GLib.Variant.new('(b)', [shield.active]));
-        }));
-        screenShield.connect('wake-up-screen', Lang.bind(this, function(shield) {
+        });
+        screenShield.connect('wake-up-screen', shield => {
             this._dbusImpl.emit_signal('WakeUpScreen', null);
-        }));
+        });
 
         this._dbusImpl = Gio.DBusExportedObject.wrapJSObject(ScreenSaverIface, this);
         this._dbusImpl.export(Gio.DBus.session, '/org/gnome/ScreenSaver');
@@ -453,11 +453,11 @@ var ScreenSaverDBus = new Lang.Class({
     },
 
     LockAsync(parameters, invocation) {
-        let tmpId = this._screenShield.connect('lock-screen-shown', Lang.bind(this, function() {
+        let tmpId = this._screenShield.connect('lock-screen-shown', () => {
             this._screenShield.disconnect(tmpId);
 
             invocation.return_value(null);
-        }));
+        });
 
         this._screenShield.lock(true);
     },

js/ui/shellEntry.js

@@ -85,10 +85,10 @@ var EntryMenu = new Lang.Class({
     },
 
     _updatePasteItem() {
-        this._clipboard.get_text(St.ClipboardType.CLIPBOARD, Lang.bind(this,
-            function(clipboard, text) {
+        this._clipboard.get_text(St.ClipboardType.CLIPBOARD,
+            (clipboard, text) => {
                 this._pasteItem.setSensitive(text && text != '');
-            }));
+            });
     },
 
     _updatePasswordItem() {
@@ -105,14 +105,14 @@ var EntryMenu = new Lang.Class({
     },
 
     _onPasteActivated() {
-        this._clipboard.get_text(St.ClipboardType.CLIPBOARD, Lang.bind(this,
-            function(clipboard, text) {
+        this._clipboard.get_text(St.ClipboardType.CLIPBOARD,
+            (clipboard, text) => {
                 if (!text)
                     return;
                 this._entry.clutter_text.delete_selection();
                 let pos = this._entry.clutter_text.get_cursor_position();
                 this._entry.clutter_text.insert_text(text, pos);
-            }));
+            });
     },
 
     _onPasswordActivated() {
@@ -166,7 +166,7 @@ function addContextMenu(entry, params) {
 
     entry.connect('popup-menu', Lang.bind(null, _onPopup, entry));
 
-    entry.connect('destroy', function() {
+    entry.connect('destroy', () => {
         entry.menu.destroy();
         entry.menu = null;
         entry._menuManager = null;

js/ui/shellMountOperation.js

@@ -137,13 +137,13 @@ var ShellMountOperation = new Lang.Class({
         this._closeExistingDialog();
         this._dialog = new ShellMountQuestionDialog(this._gicon);
 
-        this._dialogId = this._dialog.connect('response', Lang.bind(this,
-            function(object, choice) {
+        this._dialogId = this._dialog.connect('response',
+            (object, choice) => {
                 this.mountOp.set_choice(choice);
                 this.mountOp.reply(Gio.MountOperationResult.HANDLED);
 
                 this.close();
-            }));
+            });
 
         this._dialog.update(message, choices);
         this._dialog.open();
@@ -157,8 +157,8 @@ var ShellMountOperation = new Lang.Class({
             this._dialog = new ShellMountPasswordDialog(message, this._gicon, flags);
         }
 
-        this._dialogId = this._dialog.connect('response', Lang.bind(this,
-            function(object, choice, password, remember) {
+        this._dialogId = this._dialog.connect('response',
+            (object, choice, password, remember) => {
                 if (choice == -1) {
                     this.mountOp.reply(Gio.MountOperationResult.ABORTED);
                 } else {
@@ -170,7 +170,7 @@ var ShellMountOperation = new Lang.Class({
                     this.mountOp.set_password(password);
                     this.mountOp.reply(Gio.MountOperationResult.HANDLED);
                 }
-            }));
+            });
         this._dialog.open();
     },
 
@@ -200,8 +200,8 @@ var ShellMountOperation = new Lang.Class({
             this._processesDialog = new ShellProcessesDialog(this._gicon);
             this._dialog = this._processesDialog;
 
-            this._dialogId = this._processesDialog.connect('response', Lang.bind(this,
-                function(object, choice) {
+            this._dialogId = this._processesDialog.connect('response',
+                (object, choice) => {
                     if (choice == -1) {
                         this.mountOp.reply(Gio.MountOperationResult.ABORTED);
                     } else {
@@ -210,7 +210,7 @@ var ShellMountOperation = new Lang.Class({
                     }
 
                     this.close();
-                }));
+                });
             this._processesDialog.open();
         }
 
@@ -397,24 +397,22 @@ var ShellProcessesDialog = new Lang.Class({
         this._applicationList = new St.BoxLayout({ vertical: true });
         scrollView.add_actor(this._applicationList);
 
-        this._applicationList.connect('actor-added',
-                                      Lang.bind(this, function() {
+        this._applicationList.connect('actor-added', () => {
             if (this._applicationList.get_n_children() == 1)
                 scrollView.show();
-                                      }));
+        });
 
-        this._applicationList.connect('actor-removed',
-                                      Lang.bind(this, function() {
+        this._applicationList.connect('actor-removed', () => {
             if (this._applicationList.get_n_children() == 0)
                 scrollView.hide();
-                                      }));
+        });
     },
 
     _setAppsForPids(pids) {
         // remove all the items
         this._applicationList.destroy_all_children();
 
-        pids.forEach(Lang.bind(this, function(pid) {
+        pids.forEach(pid => {
             let tracker = Shell.WindowTracker.get_default();
             let app = tracker.get_app_from_pid(pid);
 
@@ -424,12 +422,11 @@ var ShellProcessesDialog = new Lang.Class({
             let item = new ListItem(app);
             this._applicationList.add(item.actor, { x_fill: true });
 
-            item.connect('activate',
-                         Lang.bind(this, function() {
+            item.connect('activate', () => {
                 // use -1 to indicate Cancel
                 this.emit('response', -1);
-                         }));
-        }));
+            });
+        });
     },
 
     update(message, processes, choices) {
@@ -572,8 +569,8 @@ var GnomeShellMountOpHandler = new Lang.Class({
         this._closeDialog();
 
         this._dialog = new ShellMountPasswordDialog(message, this._createGIcon(iconName), flags);
-        this._dialog.connect('response', Lang.bind(this,
-            function(object, choice, password, remember) {
+        this._dialog.connect('response',
+            (object, choice, password, remember) => {
                 let details = {};
                 let response;
 
@@ -588,7 +585,7 @@ var GnomeShellMountOpHandler = new Lang.Class({
                 }
 
                 this._clearCurrentRequest(response, details);
-            }));
+            });
         this._dialog.open();
     },
 
@@ -621,11 +618,10 @@ var GnomeShellMountOpHandler = new Lang.Class({
         this._closeDialog();
 
         this._dialog = new ShellMountQuestionDialog(this._createGIcon(iconName), message);
-        this._dialog.connect('response', Lang.bind(this,
-            function(object, choice) {
+        this._dialog.connect('response', (object, choice) => {
             this._clearCurrentRequest(Gio.MountOperationResult.HANDLED,
                                       { choice: GLib.Variant.new('i', choice) });
-            }));
+        });
 
         this._dialog.update(message, choices);
         this._dialog.open();
@@ -661,8 +657,7 @@ var GnomeShellMountOpHandler = new Lang.Class({
         this._closeDialog();
 
         this._dialog = new ShellProcessesDialog(this._createGIcon(iconName));
-        this._dialog.connect('response', Lang.bind(this,
-            function(object, choice) {
+        this._dialog.connect('response', (object, choice) => {
             let response;
             let details = {};
 
@@ -674,7 +669,7 @@ var GnomeShellMountOpHandler = new Lang.Class({
             }
 
             this._clearCurrentRequest(response, details);
-            }));
+        });
 
         this._dialog.update(message, applicationPids, choices);
         this._dialog.open();

js/ui/status/accessibility.js

@@ -93,7 +93,7 @@ var ATIndicator = new Lang.Class({
         let alwaysShow = this._a11ySettings.get_boolean(KEY_ALWAYS_SHOW);
         let items = this.menu._getMenuItems();
 
-        this.actor.visible = alwaysShow || items.some(function(f) { return !!f.state; });
+        this.actor.visible = alwaysShow || items.some(f => !!f.state);
 
         return GLib.SOURCE_REMOVE;
     },
@@ -111,7 +111,7 @@ var ATIndicator = new Lang.Class({
         if (!writable)
             widget.actor.reactive = false;
         else
-            widget.connect('toggled', function(item) {
+            widget.connect('toggled', item => {
                 on_set(item.state);
             });
         return widget;
@@ -119,25 +119,23 @@ var ATIndicator = new Lang.Class({
 
     _buildItem(string, schema, key) {
         let settings = new Gio.Settings({ schema_id: schema });
-        settings.connect('changed::'+key, Lang.bind(this, function() {
+        settings.connect('changed::'+key, () => {
             widget.setToggleState(settings.get_boolean(key));
 
             this._queueSyncMenuVisibility();
-        }));
+        });
 
         let widget = this._buildItemExtended(string,
             settings.get_boolean(key),
             settings.is_writable(key),
-            function(enabled) {
-                return settings.set_boolean(key, enabled);
-            });
+            enabled => settings.set_boolean(key, enabled));
         return widget;
     },
 
     _buildHCItem() {
         let interfaceSettings = new Gio.Settings({ schema_id: DESKTOP_INTERFACE_SCHEMA });
         let wmSettings = new Gio.Settings({ schema_id: WM_SCHEMA });
-        interfaceSettings.connect('changed::' + KEY_GTK_THEME, Lang.bind(this, function() {
+        interfaceSettings.connect('changed::' + KEY_GTK_THEME, () => {
             let value = interfaceSettings.get_string(KEY_GTK_THEME);
             if (value == HIGH_CONTRAST_THEME) {
                 highContrast.setToggleState(true);
@@ -147,13 +145,13 @@ var ATIndicator = new Lang.Class({
             }
 
             this._queueSyncMenuVisibility();
-        }));
-        interfaceSettings.connect('changed::' + KEY_ICON_THEME, function() {
+        });
+        interfaceSettings.connect('changed::' + KEY_ICON_THEME, () => {
             let value = interfaceSettings.get_string(KEY_ICON_THEME);
             if (value != HIGH_CONTRAST_THEME)
                 iconTheme = value;
         });
-        wmSettings.connect('changed::' + KEY_WM_THEME, function() {
+        wmSettings.connect('changed::' + KEY_WM_THEME, () => {
             let value = wmSettings.get_string(KEY_WM_THEME);
             if (value != HIGH_CONTRAST_THEME)
                 wmTheme = value;
@@ -169,7 +167,7 @@ var ATIndicator = new Lang.Class({
             interfaceSettings.is_writable(KEY_GTK_THEME) &&
             interfaceSettings.is_writable(KEY_ICON_THEME) &&
             wmSettings.is_writable(KEY_WM_THEME),
-            function (enabled) {
+            enabled => {
                 if (enabled) {
                     interfaceSettings.set_string(KEY_GTK_THEME, HIGH_CONTRAST_THEME);
                     interfaceSettings.set_string(KEY_ICON_THEME, HIGH_CONTRAST_THEME);
@@ -189,20 +187,20 @@ var ATIndicator = new Lang.Class({
 
     _buildFontItem() {
         let settings = new Gio.Settings({ schema_id: DESKTOP_INTERFACE_SCHEMA });
-        settings.connect('changed::' + KEY_TEXT_SCALING_FACTOR, Lang.bind(this, function() {
+        settings.connect('changed::' + KEY_TEXT_SCALING_FACTOR, () => {
             let factor = settings.get_double(KEY_TEXT_SCALING_FACTOR);
             let active = (factor > 1.0);
             widget.setToggleState(active);
 
             this._queueSyncMenuVisibility();
-        }));
+        });
 
         let factor = settings.get_double(KEY_TEXT_SCALING_FACTOR);
         let initial_setting = (factor > 1.0);
         let widget = this._buildItemExtended(_("Large Text"),
             initial_setting,
             settings.is_writable(KEY_TEXT_SCALING_FACTOR),
-            function (enabled) {
+            enabled => {
                 if (enabled)
                     settings.set_double(KEY_TEXT_SCALING_FACTOR,
                                         DPI_FACTOR_LARGE);

js/ui/status/bluetooth.js

@@ -35,23 +35,23 @@ var Indicator = new Lang.Class({
         this._hadSetupDevices = global.settings.get_boolean(HAD_BLUETOOTH_DEVICES_SETUP);
 
         this._proxy = new RfkillManagerProxy(Gio.DBus.session, BUS_NAME, OBJECT_PATH,
-                                             Lang.bind(this, function(proxy, error) {
+                                             (proxy, error) => {
                                                  if (error) {
                                                      log(error.message);
                                                      return;
                                                  }
 
                                                  this._sync();
-                                             }));
+                                             });
         this._proxy.connect('g-properties-changed', Lang.bind(this, this._sync));
 
         this._item = new PopupMenu.PopupSubMenuMenuItem(_("Bluetooth"), true);
         this._item.icon.icon_name = 'bluetooth-active-symbolic';
 
         this._toggleItem = new PopupMenu.PopupMenuItem('');
-        this._toggleItem.connect('activate', Lang.bind(this, function() {
+        this._toggleItem.connect('activate', () => {
             this._proxy.BluetoothAirplaneMode = !this._proxy.BluetoothAirplaneMode;
-        }));
+        });
         this._item.menu.addMenuItem(this._toggleItem);
 
         this._item.menu.addSettingsAction(_("Bluetooth Settings"), 'gnome-bluetooth-panel.desktop');

js/ui/status/brightness.js

@@ -26,7 +26,7 @@ var Indicator = new Lang.Class({
     _init() {
         this.parent('display-brightness-symbolic');
         this._proxy = new BrightnessProxy(Gio.DBus.session, BUS_NAME, OBJECT_PATH,
-                                          Lang.bind(this, function(proxy, error) {
+                                          (proxy, error) => {
                                               if (error) {
                                                   log(error.message);
                                                   return;
@@ -34,7 +34,7 @@ var Indicator = new Lang.Class({
 
                                               this._proxy.connect('g-properties-changed', Lang.bind(this, this._sync));
                                               this._sync();
-                                          }));
+                                          });
 
         this._item = new PopupMenu.PopupBaseMenuItem({ activate: false });
         this.menu.addMenuItem(this._item);
@@ -47,12 +47,12 @@ var Indicator = new Lang.Class({
                                  style_class: 'popup-menu-icon' });
         this._item.actor.add(icon);
         this._item.actor.add(this._slider.actor, { expand: true });
-        this._item.actor.connect('button-press-event', Lang.bind(this, function(actor, event) {
+        this._item.actor.connect('button-press-event', (actor, event) => {
             return this._slider.startDragging(event);
-        }));
-        this._item.actor.connect('key-press-event', Lang.bind(this, function(actor, event) {
+        });
+        this._item.actor.connect('key-press-event', (actor, event) => {
             return this._slider.onKeyPressEvent(actor, event);
-        }));
+        });
 
     },
 

js/ui/status/keyboard.js

@@ -209,7 +209,7 @@ var InputSourceSystemSettings = new Lang.Class({
                              'GetAll',
                              new GLib.Variant('(s)', [this._BUS_IFACE]),
                              null, Gio.DBusCallFlags.NONE, -1, null,
-                             Lang.bind(this, function(conn, result) {
+                             (conn, result) => {
                                  let props;
                                  try {
                                      props = conn.call_finish(result).deep_unpack()[0];
@@ -231,7 +231,7 @@ var InputSourceSystemSettings = new Lang.Class({
                                      this._options = options;
                                      this._emitKeyboardOptionsChanged();
                                  }
-                             }));
+                             });
     },
 
     get inputSources() {
@@ -485,7 +485,7 @@ var InputSourceManager = new Lang.Class({
         for (let i in this._inputSources)
             sourcesList.push(this._inputSources[i]);
 
-        this._keyboardManager.setUserLayouts(sourcesList.map(function(x) { return x.xkbId; }));
+        this._keyboardManager.setUserLayouts(sourcesList.map(x => x.xkbId));
 
         if (!this._disableIBus && this._mruSourcesBackup) {
             this._mruSources = this._mruSourcesBackup;
@@ -733,9 +733,7 @@ var InputSourceManager = new Lang.Class({
             Main.overview.disconnect(this._overviewHiddenId);
             this._overviewHiddenId = 0;
 
-            let windows = global.get_window_actors().map(function(w) {
-                return w.meta_window;
-            });
+            let windows = global.get_window_actors().map(w => w.meta_window);
             for (let i = 0; i < windows.length; ++i) {
                 delete windows[i]._inputSources;
                 delete windows[i]._currentSource;
@@ -836,16 +834,14 @@ var InputSourceIndicator = new Lang.Class({
             let is = this._inputSourceManager.inputSources[i];
 
             let menuItem = new LayoutMenuItem(is.displayName, is.shortName);
-            menuItem.connect('activate', function() {
-                is.activate(true);
-            });
+            menuItem.connect('activate', () => { is.activate(true); });
 
             let indicatorLabel = new St.Label({ text: is.shortName,
                                                 visible: false });
 
             this._menuItems[i] = menuItem;
             this._indicatorLabels[i] = indicatorLabel;
-            is.connect('changed', function() {
+            is.connect('changed', () => {
                 menuItem.indicator.set_text(is.shortName);
                 indicatorLabel.set_text(is.shortName);
             });
@@ -939,7 +935,7 @@ var InputSourceIndicator = new Lang.Class({
                 item.radioGroup = radioGroup;
                 item.setOrnament(prop.get_state() == IBus.PropState.CHECKED ?
                                  PopupMenu.Ornament.DOT : PopupMenu.Ornament.NONE);
-                item.connect('activate', Lang.bind(this, function() {
+                item.connect('activate', () => {
                     if (item.prop.get_state() == IBus.PropState.CHECKED)
                         return;
 
@@ -957,13 +953,13 @@ var InputSourceIndicator = new Lang.Class({
                                                          IBus.PropState.UNCHECKED);
                         }
                     }
-                }));
+                });
                 break;
 
             case IBus.PropType.TOGGLE:
                 item = new PopupMenu.PopupSwitchMenuItem(prop.get_label().get_text(), prop.get_state() == IBus.PropState.CHECKED);
                 item.prop = prop;
-                item.connect('toggled', Lang.bind(this, function() {
+                item.connect('toggled', () => {
                     if (item.state) {
                         item.prop.set_state(IBus.PropState.CHECKED);
                         ibusManager.activateProperty(item.prop.get_key(),
@@ -973,16 +969,16 @@ var InputSourceIndicator = new Lang.Class({
                         ibusManager.activateProperty(item.prop.get_key(),
                                                      IBus.PropState.UNCHECKED);
                     }
-                }));
+                });
                 break;
 
             case IBus.PropType.NORMAL:
                 item = new PopupMenu.PopupMenuItem(prop.get_label().get_text());
                 item.prop = prop;
-                item.connect('activate', Lang.bind(this, function() {
+                item.connect('activate', () => {
                     ibusManager.activateProperty(item.prop.get_key(),
                                                  item.prop.get_state());
-                }));
+                });
                 break;
 
             case IBus.PropType.SEPARATOR:

js/ui/status/location.js

@@ -116,11 +116,11 @@ var Indicator = new Lang.Class({
                                            this._permStoreProxy,
                                            this._getMaxAccuracyLevel());
 
-        authorizer.authorize(Lang.bind(this, function(accuracyLevel) {
+        authorizer.authorize(accuracyLevel => {
             let ret = (accuracyLevel != GeoclueAccuracyLevel.NONE);
             invocation.return_value(GLib.Variant.new('(bu)',
                                                      [ret, accuracyLevel]));
-        }));
+        });
     },
 
     _syncIndicator() {
@@ -331,12 +331,11 @@ var AppAuthorizer = new Lang.Class({
                                              reason,
                                              this.reqAccuracyLevel);
 
-        let responseId = this._dialog.connect('response', Lang.bind(this,
-            function(dialog, level) {
+        let responseId = this._dialog.connect('response', (dialog, level) => {
             this._dialog.disconnect(responseId);
             this._accuracyLevel = level;
             this._completeAuth();
-            }));
+        });
 
         this._dialog.open();
     },
@@ -367,7 +366,7 @@ var AppAuthorizer = new Lang.Class({
                                        APP_PERMISSIONS_ID,
                                        this._permissions,
                                        data,
-                                       function (result, error) {
+                                       (result, error) => {
             if (error != null)
                 log(error.message);
         });

js/ui/status/network.js

@@ -293,12 +293,10 @@ var NMConnectionSection = new Lang.Class({
         if (!item)
             return;
 
-        item.connect('icon-changed', Lang.bind(this, function() {
-            this._iconChanged();
-        }));
-        item.connect('activation-failed', Lang.bind(this, function(item, reason) {
+        item.connect('icon-changed', () => { this._iconChanged(); });
+        item.connect('activation-failed', (item, reason) => {
             this.emit('activation-failed', reason);
-        }));
+        });
         item.connect('name-changed', Lang.bind(this, this._sync));
 
         let pos = Util.insertSorted(this._connections, connection, Lang.bind(this, this._connectionSortFunction));
@@ -550,9 +548,9 @@ var NMDeviceModem = new Lang.Class({
 
         if (this._mobileDevice) {
             this._operatorNameId = this._mobileDevice.connect('notify::operator-name', Lang.bind(this, this._sync));
-            this._signalQualityId = this._mobileDevice.connect('notify::signal-quality', Lang.bind(this, function() {
+            this._signalQualityId = this._mobileDevice.connect('notify::signal-quality', () => {
                 this._iconChanged();
-            }));
+            });
         }
     },
 
@@ -649,13 +647,9 @@ var NMWirelessDialogItem = new Lang.Class({
         this.actor = new St.BoxLayout({ style_class: 'nm-dialog-item',
                                         can_focus: true,
                                         reactive: true });
-        this.actor.connect('key-focus-in', Lang.bind(this, function() {
-            this.emit('selected');
-        }));
+        this.actor.connect('key-focus-in', () => { this.emit('selected'); });
         let action = new Clutter.ClickAction();
-        action.connect('clicked', Lang.bind(this, function() {
-            this.actor.grab_key_focus();
-        }));
+        action.connect('clicked', () => { this.actor.grab_key_focus(); });
         this.actor.add_action(action);
 
         let title = ssidToLabel(this._ap.get_ssid());
@@ -725,9 +719,9 @@ var NMWirelessDialog = new Lang.Class({
         this._buildLayout();
 
         let connections = client.get_connections();
-        this._connections = connections.filter(Lang.bind(this, function(connection) {
-            return device.connection_valid(connection);
-        }));
+        this._connections = connections.filter(
+            connection => device.connection_valid(connection)
+        );
 
         this._apAddedId = device.connect('access-point-added', Lang.bind(this, this._accessPointAdded));
         this._apRemovedId = device.connect('access-point-removed', Lang.bind(this, this._accessPointRemoved));
@@ -735,9 +729,9 @@ var NMWirelessDialog = new Lang.Class({
 
         // accessPointAdded will also create dialog items
         let accessPoints = device.get_access_points() || [ ];
-        accessPoints.forEach(Lang.bind(this, function(ap) {
+        accessPoints.forEach(ap => {
             this._accessPointAdded(this._device, ap);
-        }));
+        });
 
         this._selectedNetwork = null;
         this._activeApChanged();
@@ -902,12 +896,12 @@ var NMWirelessDialog = new Lang.Class({
 
         let airplaneSubStack = new St.Widget({ layout_manager: new Clutter.BinLayout });
         this._airplaneButton = new St.Button({ style_class: 'modal-dialog-button button' });
-        this._airplaneButton.connect('clicked', Lang.bind(this, function() {
+        this._airplaneButton.connect('clicked', () => {
             if (this._rfkill.airplaneMode)
                 this._rfkill.airplaneMode = false;
             else
                 this._client.wireless_enabled = true;
-        }));
+        });
         airplaneSubStack.add_actor(this._airplaneButton);
         this._airplaneInactive = new St.Label({ style_class: 'nm-dialog-airplane-text',
                                                 text: _("Use hardware switch to turn off") });
@@ -1058,7 +1052,7 @@ var NMWirelessDialog = new Lang.Class({
     },
 
     _checkConnections(network, accessPoint) {
-        this._connections.forEach(function(connection) {
+        this._connections.forEach(connection => {
             if (accessPoint.connection_valid(connection) &&
                 network.connections.indexOf(connection) == -1) {
                 network.connections.push(connection);
@@ -1084,7 +1078,7 @@ var NMWirelessDialog = new Lang.Class({
                 return;
             }
 
-            Util.insertSorted(network.accessPoints, accessPoint, function(one, two) {
+            Util.insertSorted(network.accessPoints, accessPoint, (one, two) => {
                 return two.strength - one.strength;
             });
             network.item.updateBestAP(network.accessPoints[0]);
@@ -1137,9 +1131,9 @@ var NMWirelessDialog = new Lang.Class({
         let scrollValue = adjustment.value;
 
         this._itemBox.remove_all_children();
-        this._networks.forEach(Lang.bind(this, function(network) {
+        this._networks.forEach(network => {
             this._itemBox.add_child(network.item.actor);
-        }));
+        });
 
         adjustment.value = scrollValue;
     },
@@ -1158,10 +1152,10 @@ var NMWirelessDialog = new Lang.Class({
     _createNetworkItem(network) {
         network.item = new NMWirelessDialogItem(network);
         network.item.setActive(network == this._selectedNetwork);
-        network.item.connect('selected', Lang.bind(this, function() {
+        network.item.connect('selected', () => {
             Util.ensureActorVisibleInScrollView(this._scrollView, network.item.actor);
             this._selectNetwork(network);
-        }));
+        });
     },
 });
 
@@ -1518,12 +1512,12 @@ var NMVpnSection = new Lang.Class({
         for (let item of connections) {
             item.setActiveConnection(null);
         }
-        vpnConnections.forEach(Lang.bind(this, function(a) {
+        vpnConnections.forEach(a => {
             if (a.connection) {
                 let item = this._connectionItems.get(a.connection.get_uuid());
                 item.setActiveConnection(a);
             }
-        }));
+        });
     },
 
     _makeConnectionItem(connection) {
@@ -1570,9 +1564,7 @@ var DeviceCategory = new Lang.Class({
 
     _sync() {
         let nDevices = this.section.box.get_children().reduce(
-            function(prev, child) {
-                return prev + (child.visible ? 1 : 0);
-            }, 0);
+            (prev, child) => prev + (child.visible ? 1 : 0), 0);
         this._summaryItem.label.text = this._getSummaryLabel(nDevices);
         let shouldSummarize = nDevices > MAX_DEVICE_ITEMS;
         this._summaryItem.actor.visible = shouldSummarize;
@@ -1700,9 +1692,7 @@ var NMApplet = new Lang.Class({
                                                   'network-transmit-receive');
             this._source.policy = new MessageTray.NotificationApplicationPolicy('gnome-network-panel');
 
-            this._source.connect('destroy', Lang.bind(this, function() {
-                this._source = null;
-            }));
+            this._source.connect('destroy', () => { this._source = null; });
             Main.messageTray.add(this._source);
         }
     },
@@ -1725,7 +1715,7 @@ var NMApplet = new Lang.Class({
         this._notification = new MessageTray.Notification(this._source, title, text, { gicon: gicon });
         this._notification.setUrgency(urgency);
         this._notification.setTransient(true);
-        this._notification.connect('destroy', function() {
+        this._notification.connect('destroy', () => {
             this._notification = null;
         });
         this._source.notify(this._notification);
@@ -1767,7 +1757,7 @@ var NMApplet = new Lang.Class({
                 this._syncDeviceNames();
 
             if (wrapper instanceof NMConnectionSection) {
-                this._connections.forEach(function(connection) {
+                this._connections.forEach(connection => {
                     wrapper.checkConnection(connection);
                 });
             }
@@ -1854,12 +1844,12 @@ var NMApplet = new Lang.Class({
 
     _syncVpnConnections() {
         let activeConnections = this._client.get_active_connections() || [];
-        let vpnConnections = activeConnections.filter(function(a) {
-            return (a instanceof NM.VpnConnection);
-        });
-        vpnConnections.forEach(Lang.bind(this, function(a) {
+        let vpnConnections = activeConnections.filter(
+            a => (a instanceof NM.VpnConnection)
+        );
+        vpnConnections.forEach(a => {
             ensureActiveConnectionProps(a, this._client);
-        }));
+        });
         this._vpnSection.setActiveConnections(vpnConnections);
 
         this._updateIcon();
@@ -1943,7 +1933,7 @@ var NMApplet = new Lang.Class({
             this._vpnSection.checkConnection(connection);
         } else {
             let devices = this._devices[section].devices;
-            devices.forEach(function(wrapper) {
+            devices.forEach(wrapper => {
                 if (wrapper instanceof NMConnectionSection)
                     wrapper.checkConnection(connection);
             });
@@ -1989,13 +1979,13 @@ var NMApplet = new Lang.Class({
             this._closeConnectivityCheck(path);
             return;
         } else if (result == PortalHelperResult.RECHECK) {
-            this._client.check_connectivity_async(null, Lang.bind(this, function(client, result) {
+            this._client.check_connectivity_async(null, (client, result) => {
                 try {
                     let state = client.check_connectivity_finish(result);
                     if (state >= NM.ConnectivityState.FULL)
                         this._closeConnectivityCheck(path);
                 } catch(e) { }
-            }));
+            });
         } else {
             log('Invalid result from portal helper: ' + result);
         }
@@ -2030,7 +2020,7 @@ var NMApplet = new Lang.Class({
             this._portalHelperProxy.AuthenticateRemote(path, '', timestamp);
         } else {
             new PortalHelperProxy(Gio.DBus.session, 'org.gnome.Shell.PortalHelper',
-                                  '/org/gnome/Shell/PortalHelper', Lang.bind(this, function (proxy, error) {
+                                  '/org/gnome/Shell/PortalHelper', (proxy, error) => {
                                       if (error) {
                                           log('Error launching the portal helper: ' + error);
                                           return;
@@ -2040,7 +2030,7 @@ var NMApplet = new Lang.Class({
                                       proxy.connectSignal('Done', Lang.bind(this, this._portalHelperDone));
 
                                       proxy.AuthenticateRemote(path, '', timestamp);
-                                  }));
+                                  });
         }
 
         this._connectivityQueue.push(path);

js/ui/status/power.js

@@ -47,7 +47,7 @@ var Indicator = new Lang.Class({
         this.indicators.add_style_class_name('power-status');
 
         this._proxy = new PowerManagerProxy(Gio.DBus.system, BUS_NAME, OBJECT_PATH,
-                                            Lang.bind(this, function(proxy, error) {
+                                            (proxy, error) => {
                                                 if (error) {
                                                     log(error.message);
                                                     return;
@@ -55,7 +55,7 @@ var Indicator = new Lang.Class({
                                                 this._proxy.connect('g-properties-changed',
                                                                     Lang.bind(this, this._sync));
                                                 this._sync();
-                                            }));
+                                            });
 
         this._item = new PopupMenu.PopupSubMenuMenuItem("", true);
         this._item.menu.addSettingsAction(_("Power Settings"), 'gnome-power-panel.desktop');

js/ui/status/rfkill.js

@@ -26,7 +26,7 @@ var RfkillManager = new Lang.Class({
 
     _init() {
         this._proxy = new RfkillManagerProxy(Gio.DBus.session, BUS_NAME, OBJECT_PATH,
-                                             Lang.bind(this, function(proxy, error) {
+                                             (proxy, error) => {
                                                  if (error) {
                                                      log(error.message);
                                                      return;
@@ -34,7 +34,7 @@ var RfkillManager = new Lang.Class({
                                                  this._proxy.connect('g-properties-changed',
                                                                      Lang.bind(this, this._changed));
                                                  this._changed();
-                                             }));
+                                             });
     },
 
     get airplaneMode() {
@@ -87,9 +87,9 @@ var Indicator = new Lang.Class({
         // changing the menu contents.
         this._item = new PopupMenu.PopupSubMenuMenuItem(_("Airplane Mode On"), true);
         this._item.icon.icon_name = 'airplane-mode-symbolic';
-        this._offItem = this._item.menu.addAction(_("Turn Off"), Lang.bind(this, function() {
+        this._offItem = this._item.menu.addAction(_("Turn Off"), () => {
             this._manager.airplaneMode = false;
-        }));
+        });
         this._item.menu.addSettingsAction(_("Network Settings"), 'gnome-network-panel.desktop');
         this.menu.addMenuItem(this._item);
 

js/ui/status/system.js

@@ -133,13 +133,12 @@ var Indicator = new Lang.Class({
         // settings (disable-log-out) and Polkit policy - the latter doesn't
         // notify, so we update the menu item each time the menu opens or
         // the lockdown setting changes, which should be close enough.
-        this.menu.connect('open-state-changed', Lang.bind(this,
-            function(menu, open) {
+        this.menu.connect('open-state-changed', (menu, open) => {
             if (!open)
                 return;
 
             this._systemActions.forceUpdate();
-            }));
+        });
         this._updateMultiUser();
 
         Main.sessionMode.connect('updated', Lang.bind(this, this._sessionUpdated));
@@ -220,10 +219,10 @@ var Indicator = new Lang.Class({
         // the popup menu, and we can't easily connect on allocation-changed
         // or notify::width without creating layout cycles, simply update the
         // label whenever the menu is opened.
-        this.menu.connect('open-state-changed', Lang.bind(this, function(menu, isOpen) {
+        this.menu.connect('open-state-changed', (menu, isOpen) => {
             if (isOpen)
                 this._updateSwitchUserSubMenu();
-        }));
+        });
 
         item = new PopupMenu.PopupMenuItem(_("Switch User"));
         item.connect('activate', () => {

js/ui/status/thunderbolt.js

@@ -132,7 +132,7 @@ var Client = new Lang.Class({
 
     enrollDevice(id, policy, callback) {
 	this._proxy.EnrollDeviceRemote(id, policy, AuthFlags.NONE,
-				       Lang.bind(this, function (res, error) {
+                                       (res, error) => {
 	    if (error) {
 		callback(null, error);
 		return;
@@ -143,7 +143,7 @@ var Client = new Lang.Class({
 					     BOLT_DBUS_NAME,
 					     path);
 	    callback(device, null);
-	}));
+	});
     }
 
 });
@@ -271,9 +271,7 @@ var Indicator = new Lang.Class({
         if (!this._source) {
             this._source = new MessageTray.Source(_("Thunderbolt"),
                                                   'thunderbolt-symbolic');
-            this._source.connect('destroy', Lang.bind(this, function() {
-                this._source = null;
-            }));
+            this._source.connect('destroy', () => { this._source = null; });
 
             Main.messageTray.add(this._source);
         }
@@ -289,7 +287,7 @@ var Indicator = new Lang.Class({
 
 	this._notification = new MessageTray.Notification(source, title, body);
 	this._notification.setUrgency(MessageTray.Urgency.HIGH);
-        this._notification.connect('destroy', function() {
+        this._notification.connect('destroy', () => {
             this._notification = null;
         });
         this._notification.connect('activated', () => {

js/ui/status/volume.js

@@ -42,12 +42,12 @@ var StreamSlider = new Lang.Class({
         this._icon = new St.Icon({ style_class: 'popup-menu-icon' });
         this.item.actor.add(this._icon);
         this.item.actor.add(this._slider.actor, { expand: true });
-        this.item.actor.connect('button-press-event', Lang.bind(this, function(actor, event) {
+        this.item.actor.connect('button-press-event', (actor, event) => {
             return this._slider.startDragging(event);
-        }));
-        this.item.actor.connect('key-press-event', Lang.bind(this, function(actor, event) {
+        });
+        this.item.actor.connect('key-press-event', (actor, event) => {
             return this._slider.onKeyPressEvent(actor, event);
-        }));
+        });
 
         this._stream = null;
     },
@@ -270,9 +270,9 @@ var VolumeMenu = new Lang.Class({
         this._control.connect('default-source-changed', Lang.bind(this, this._readInput));
 
         this._output = new OutputStreamSlider(this._control);
-        this._output.connect('stream-updated', Lang.bind(this, function() {
+        this._output.connect('stream-updated', () => {
             this.emit('icon-changed');
-        }));
+        });
         this.addMenuItem(this._output.item);
 
         this._input = new InputStreamSlider(this._control);
@@ -324,7 +324,7 @@ var Indicator = new Lang.Class({
 
         this._control = getMixerControl();
         this._volumeMenu = new VolumeMenu(this._control);
-        this._volumeMenu.connect('icon-changed', Lang.bind(this, function(menu) {
+        this._volumeMenu.connect('icon-changed', menu => {
             let icon = this._volumeMenu.getIcon();
 
             if (icon != null) {
@@ -333,7 +333,7 @@ var Indicator = new Lang.Class({
             } else {
                 this.indicators.hide();
             }
-        }));
+        });
 
         this.menu.addMenuItem(this._volumeMenu);
 

js/ui/switcherPopup.js

@@ -161,12 +161,12 @@ var SwitcherPopup = new Lang.Class({
         // We delay showing the popup so that fast Alt+Tab users aren't
         // disturbed by the popup briefly flashing.
         this._initialDelayTimeoutId = Mainloop.timeout_add(POPUP_DELAY_TIMEOUT,
-                                                           Lang.bind(this, function () {
+                                                           () => {
                                                                Main.osdWindowManager.hideAll();
                                                                this.actor.opacity = 255;
                                                                this._initialDelayTimeoutId = 0;
                                                                return GLib.SOURCE_REMOVE;
-                                                           }));
+                                                           });
         GLib.Source.set_name_by_id(this._initialDelayTimeoutId, '[gnome-shell] Main.osdWindow.cancel');
         return true;
     },
@@ -282,11 +282,11 @@ var SwitcherPopup = new Lang.Class({
             Mainloop.source_remove(this._noModsTimeoutId);
 
         this._noModsTimeoutId = Mainloop.timeout_add(NO_MODS_TIMEOUT,
-                                                     Lang.bind(this, function () {
+                                                     () => {
                                                          this._finish(global.get_current_time());
                                                          this._noModsTimeoutId = 0;
                                                          return GLib.SOURCE_REMOVE;
-                                                     }));
+                                                     });
     },
 
     _popModal() {
@@ -303,10 +303,9 @@ var SwitcherPopup = new Lang.Class({
                              { opacity: 0,
                                time: POPUP_FADE_OUT_TIME,
                                transition: 'easeOutQuad',
-                               onComplete: Lang.bind(this,
-                                   function() {
+                               onComplete: () => {
                                    this.actor.destroy();
-                                   })
+                               }
                              });
         } else
             this.actor.destroy();
@@ -346,9 +345,9 @@ var SwitcherList = new Lang.Class({
         // children to have the same width.
         this._list = new Shell.GenericContainer({ style_class: 'switcher-list-item-container' });
         this._list.spacing = 0;
-        this._list.connect('style-changed', Lang.bind(this, function() {
+        this._list.connect('style-changed', () => {
             this._list.spacing = this._list.get_theme_node().get_length('spacing');
-                                                     }));
+        });
 
         this._list.connect('get-preferred-width', Lang.bind(this, this._getPreferredWidth));
         this._list.connect('get-preferred-height', Lang.bind(this, this._getPreferredHeight));
@@ -366,12 +365,14 @@ var SwitcherList = new Lang.Class({
         // Those arrows indicate whether scrolling in one direction is possible
         this._leftArrow = new St.DrawingArea({ style_class: 'switcher-arrow',
                                                pseudo_class: 'highlighted' });
-        this._leftArrow.connect('repaint', Lang.bind(this,
-            function() { drawArrow(this._leftArrow, St.Side.LEFT); }));
+        this._leftArrow.connect('repaint', () => {
+            drawArrow(this._leftArrow, St.Side.LEFT);
+        });
         this._rightArrow = new St.DrawingArea({ style_class: 'switcher-arrow',
                                                 pseudo_class: 'highlighted' });
-        this._rightArrow.connect('repaint', Lang.bind(this,
-            function() { drawArrow(this._rightArrow, St.Side.RIGHT); }));
+        this._rightArrow.connect('repaint', () => {
+            drawArrow(this._rightArrow, St.Side.RIGHT);
+        });
 
         this.actor.add_actor(this._leftArrow);
         this.actor.add_actor(this._rightArrow);
@@ -422,8 +423,8 @@ var SwitcherList = new Lang.Class({
         this._list.add_actor(bbox);
 
         let n = this._items.length;
-        bbox.connect('clicked', Lang.bind(this, function() { this._onItemClicked(n); }));
-        bbox.connect('motion-event', Lang.bind(this, function() { return this._onItemEnter(n); }));
+        bbox.connect('clicked', () => { this._onItemClicked(n); });
+        bbox.connect('motion-event', () => this._onItemEnter(n));
 
         bbox.label_actor = label;
 
@@ -494,11 +495,11 @@ var SwitcherList = new Lang.Class({
                          { value: value,
                            time: POPUP_SCROLL_TIME,
                            transition: 'easeOutQuad',
-                           onComplete: Lang.bind(this, function () {
+                           onComplete: () => {
                                 if (this._highlighted == 0)
                                     this._scrollableLeft = false;
                                 this.actor.queue_relayout();
-                           })
+                           }
                           });
     },
 
@@ -518,11 +519,11 @@ var SwitcherList = new Lang.Class({
                          { value: value,
                            time: POPUP_SCROLL_TIME,
                            transition: 'easeOutQuad',
-                           onComplete: Lang.bind(this, function () {
+                           onComplete: () => {
                                 if (this._highlighted == this._items.length - 1)
                                     this._scrollableRight = false;
                                 this.actor.queue_relayout();
-                            })
+                            }
                           });
     },
 

js/ui/tweener.js

@@ -49,7 +49,7 @@ function _wrapTweening(target, tweeningParameters) {
             state.destroyedId = target.connect('destroy', _actorDestroyed);
         } else if (target.actor && target.actor instanceof Clutter.Actor) {
             state.actor = target.actor;
-            state.destroyedId = target.actor.connect('destroy', function() { _actorDestroyed(target); });
+            state.destroyedId = target.actor.connect('destroy', () => { _actorDestroyed(target); });
         }
     }
 
@@ -87,12 +87,12 @@ function _addHandler(target, params, name, handler) {
         let oldParams = params[name + 'Params'];
         let eventScope = oldScope ? oldScope : target;
 
-        params[name] = function () {
+        params[name] = () => {
             oldHandler.apply(eventScope, oldParams);
             handler(target);
         };
     } else
-        params[name] = function () { handler(target); };
+        params[name] = () => { handler(target); };
 }
 
 function _actorDestroyed(target) {
@@ -178,10 +178,9 @@ var ClutterFrameTicker = new Lang.Class({
         this._startTime = -1;
         this._currentTime = -1;
 
-        this._timeline.connect('new-frame', Lang.bind(this,
-            function(timeline, frame) {
+        this._timeline.connect('new-frame', (timeline, frame) => {
             this._onNewFrame(frame);
-            }));
+        });
 
         let perf_log = Shell.PerfLog.get_default();
         perf_log.define_event("tweener.framePrepareStart",

js/ui/viewSelector.js

@@ -84,9 +84,9 @@ var ShowOverviewAction = new Lang.Class({
         this.parent();
         this.set_n_touch_points(3);
 
-        global.display.connect('grab-op-begin', Lang.bind(this, function() {
+        global.display.connect('grab-op-begin', () => {
             this.cancel();
-        }));
+        });
     },
 
     vfunc_gesture_prepare(action, actor) {
@@ -157,12 +157,12 @@ var ViewSelector = new Lang.Class({
         this._text = this._entry.clutter_text;
         this._text.connect('text-changed', Lang.bind(this, this._onTextChanged));
         this._text.connect('key-press-event', Lang.bind(this, this._onKeyPress));
-        this._text.connect('key-focus-in', Lang.bind(this, function() {
+        this._text.connect('key-focus-in', () => {
             this._searchResults.highlightDefault(true);
-        }));
-        this._text.connect('key-focus-out', Lang.bind(this, function() {
+        });
+        this._text.connect('key-focus-out', () => {
             this._searchResults.highlightDefault(false);
-        }));
+        });
         this._entry.connect('popup-menu', () => {
             if (!this._searchActive)
                 return;
@@ -198,28 +198,25 @@ var ViewSelector = new Lang.Class({
         // dummy widget as the last results container child so that we can
         // include the entry in the keynav tab path
         this._focusTrap = new FocusTrap({ can_focus: true });
-        this._focusTrap.connect('key-focus-in', Lang.bind(this, function() {
+        this._focusTrap.connect('key-focus-in', () => {
             this._entry.grab_key_focus();
-        }));
+        });
         this._searchResults.actor.add_actor(this._focusTrap);
 
         global.focus_manager.add_group(this._searchResults.actor);
 
         this._stageKeyPressId = 0;
-        Main.overview.connect('showing', Lang.bind(this,
-            function () {
+        Main.overview.connect('showing', () => {
             this._stageKeyPressId = global.stage.connect('key-press-event',
                                                          Lang.bind(this, this._onStageKeyPress));
-            }));
-        Main.overview.connect('hiding', Lang.bind(this,
-            function () {
+        });
+        Main.overview.connect('hiding', () => {
             if (this._stageKeyPressId != 0) {
                 global.stage.disconnect(this._stageKeyPressId);
                 this._stageKeyPressId = 0;
             }
-            }));
-        Main.overview.connect('shown', Lang.bind(this,
-            function() {
+        });
+        Main.overview.connect('shown', () => {
             // If we were animating from the desktop view to the
             // apps page the workspace page was visible, allowing
             // the windows to animate, but now we no longer want to
@@ -229,7 +226,7 @@ var ViewSelector = new Lang.Class({
                 this._workspacesPage.opacity = 0;
                 this._workspacesPage.hide();
             }
-            }));
+        });
 
         Main.wm.addKeybinding('toggle-application-view',
                               new Gio.Settings({ schema_id: SHELL_KEYBINDINGS_SCHEMA }),
@@ -252,12 +249,12 @@ var ViewSelector = new Lang.Class({
             side = St.Side.LEFT;
         let gesture = new EdgeDragAction.EdgeDragAction(side,
                                                         Shell.ActionMode.NORMAL);
-        gesture.connect('activated', Lang.bind(this, function() {
+        gesture.connect('activated', () => {
             if (Main.overview.visible)
                 Main.overview.hide();
             else
                 this.showApps();
-        }));
+        });
         global.stage.add_action(gesture);
 
         gesture = new ShowOverviewAction();
@@ -330,10 +327,9 @@ var ViewSelector = new Lang.Class({
         else
             Main.ctrlAltTabManager.addGroup(actor, name, a11yIcon,
                                             { proxy: this.actor,
-                                              focusCallback: Lang.bind(this,
-                                                  function() {
+                                              focusCallback: () => {
                                                   this._a11yFocusPage(page);
-                                                  })
+                                              }
                                             });;
         page.hide();
         this.actor.add_actor(page);
@@ -354,9 +350,9 @@ var ViewSelector = new Lang.Class({
                          { opacity: 0,
                            time: OverviewControls.SIDE_CONTROLS_ANIMATION_TIME,
                            transition: 'easeOutQuad',
-                           onComplete: Lang.bind(this, function() {
+                           onComplete: () => {
                                this._animateIn(oldPage);
-                           })
+                           }
                          });
     },
 
@@ -382,10 +378,9 @@ var ViewSelector = new Lang.Class({
         if (page == this._appsPage &&
             this._activePage == this._workspacesPage &&
             !Main.overview.animationInProgress) {
-            this.appDisplay.animate(IconGrid.AnimationDirection.OUT, Lang.bind(this,
-                function() {
+            this.appDisplay.animate(IconGrid.AnimationDirection.OUT, () => {
                 this._animateIn(oldPage)
-                }));
+            });
         } else {
             this._fadePageOut(page);
         }

js/ui/windowAttentionHandler.js

@@ -40,17 +40,17 @@ var WindowAttentionHandler = new Lang.Class({
         let [title, banner] = this._getTitleAndBanner(app, window);
 
         let notification = new MessageTray.Notification(source, title, banner);
-        notification.connect('activated', function() {
+        notification.connect('activated', () => {
             source.open();
         });
         notification.setForFeedback(true);
 
         source.notify(notification);
 
-        source.signalIDs.push(window.connect('notify::title', Lang.bind(this, function() {
+        source.signalIDs.push(window.connect('notify::title', () => {
             let [title, banner] = this._getTitleAndBanner(app, window);
             notification.update(title, banner);
-        })));
+        }));
     }
 });
 
@@ -65,9 +65,12 @@ var Source = new Lang.Class({
         this.parent(app.get_name());
 
         this.signalIDs = [];
-        this.signalIDs.push(this._window.connect('notify::demands-attention', Lang.bind(this, function() { this.destroy(); })));
-        this.signalIDs.push(this._window.connect('focus', Lang.bind(this, function() { this.destroy(); })));
-        this.signalIDs.push(this._window.connect('unmanaged', Lang.bind(this, function() { this.destroy(); })));
+        this.signalIDs.push(this._window.connect('notify::demands-attention',
+                                                 () => { this.destroy(); }));
+        this.signalIDs.push(this._window.connect('focus',
+                                                 () => { this.destroy(); }));
+        this.signalIDs.push(this._window.connect('unmanaged',
+                                                 () => { this.destroy(); }));
 
         this.connect('destroy', Lang.bind(this, this._onDestroy));
     },

js/ui/windowManager.js

@@ -296,24 +296,24 @@ var WorkspaceTracker = new Lang.Class({
         if (workspace._keepAliveId)
             Mainloop.source_remove(workspace._keepAliveId);
 
-        workspace._keepAliveId = Mainloop.timeout_add(duration, Lang.bind(this, function() {
+        workspace._keepAliveId = Mainloop.timeout_add(duration, () => {
             workspace._keepAliveId = 0;
             this._queueCheckWorkspaces();
             return GLib.SOURCE_REMOVE;
-        }));
+        });
         GLib.Source.set_name_by_id(workspace._keepAliveId, '[gnome-shell] this._queueCheckWorkspaces');
     },
 
     _windowRemoved(workspace, window) {
         workspace._lastRemovedWindow = window;
         this._queueCheckWorkspaces();
-        let id = Mainloop.timeout_add(LAST_WINDOW_GRACE_TIME, Lang.bind(this, function() {
+        let id = Mainloop.timeout_add(LAST_WINDOW_GRACE_TIME, () => {
             if (workspace._lastRemovedWindow == window) {
                 workspace._lastRemovedWindow = null;
                 this._queueCheckWorkspaces();
             }
             return GLib.SOURCE_REMOVE;
-        }));
+        });
         GLib.Source.set_name_by_id(id, '[gnome-shell] this._queueCheckWorkspaces');
     },
 
@@ -378,7 +378,7 @@ var WorkspaceTracker = new Lang.Class({
             }
 
             let lostWorkspaces = this._workspaces.splice(removedIndex, removedNum);
-            lostWorkspaces.forEach(function(workspace) {
+            lostWorkspaces.forEach(workspace => {
                 workspace.disconnect(workspace._windowAddedId);
                 workspace.disconnect(workspace._windowRemovedId);
             });
@@ -545,9 +545,9 @@ var WorkspaceSwitchAction = new Lang.Class({
         this.set_n_touch_points(4);
         this.set_threshold_trigger_distance(MOTION_THRESHOLD, MOTION_THRESHOLD);
 
-        global.display.connect('grab-op-begin', Lang.bind(this, function() {
+        global.display.connect('grab-op-begin', () => {
             this.cancel();
-        }));
+        });
     },
 
     vfunc_gesture_prepare(actor) {
@@ -584,9 +584,9 @@ var AppSwitchAction = new Lang.Class({
         this.parent();
         this.set_n_touch_points(3);
 
-        global.display.connect('grab-op-begin', Lang.bind(this, function() {
+        global.display.connect('grab-op-begin', () => {
             this.cancel();
-        }));
+        });
     },
 
     vfunc_gesture_prepare(action, actor) {
@@ -693,12 +693,12 @@ var WindowManager = new Lang.Class({
 
         this._switchData = null;
         this._shellwm.connect('kill-switch-workspace', Lang.bind(this, this._switchWorkspaceDone));
-        this._shellwm.connect('kill-window-effects', Lang.bind(this, function (shellwm, actor) {
+        this._shellwm.connect('kill-window-effects', (shellwm, actor) => {
             this._minimizeWindowDone(shellwm, actor);
             this._mapWindowDone(shellwm, actor);
             this._destroyWindowDone(shellwm, actor);
             this._sizeChangeWindowDone(shellwm, actor);
-        }));
+        });
 
         this._shellwm.connect('switch-workspace', Lang.bind(this, this._switchWorkspace));
         this._shellwm.connect('show-tile-preview', Lang.bind(this, this._showTilePreview));
@@ -927,21 +927,21 @@ var WindowManager = new Lang.Class({
 
         global.display.connect('show-resize-popup', Lang.bind(this, this._showResizePopup));
         global.display.connect('show-pad-osd', Lang.bind(this, this._showPadOsd));
-        global.display.connect('show-osd', Lang.bind(this, function (display, monitorIndex, iconName, label) {
+        global.display.connect('show-osd', (display, monitorIndex, iconName, label) => {
             let icon = Gio.Icon.new_for_string(iconName);
             Main.osdWindowManager.show(monitorIndex, icon, label, null);
-        }));
+        });
 
         this._gsdWacomProxy = new GsdWacomProxy(Gio.DBus.session, GSD_WACOM_BUS_NAME,
                                                 GSD_WACOM_OBJECT_PATH,
-                                                Lang.bind(this, function(proxy, error) {
+                                                (proxy, error) => {
                                                     if (error) {
                                                         log(error.message);
                                                         return;
                                                     }
-                                                }));
+                                                });
 
-        global.display.connect('pad-mode-switch', Lang.bind(this, function (display, pad, group, mode) {
+        global.display.connect('pad-mode-switch', (display, pad, group, mode) => {
             let labels = [];
 
             //FIXME: Fix num buttons
@@ -954,16 +954,16 @@ var WindowManager = new Lang.Class({
                 this._gsdWacomProxy.SetOLEDLabelsRemote(pad.get_device_node(), labels);
                 this._gsdWacomProxy.SetGroupModeLEDRemote(pad.get_device_node(), group, mode);
             }
-        }));
+        });
 
-        Main.overview.connect('showing', Lang.bind(this, function() {
+        Main.overview.connect('showing', () => {
             for (let i = 0; i < this._dimmedWindows.length; i++)
                 this._undimWindow(this._dimmedWindows[i]);
-        }));
-        Main.overview.connect('hiding', Lang.bind(this, function() {
+        });
+        Main.overview.connect('hiding', () => {
             for (let i = 0; i < this._dimmedWindows.length; i++)
                 this._dimWindow(this._dimmedWindows[i]);
-        }));
+        });
 
         this._windowMenuManager = new WindowMenu.WindowMenuManager();
 
@@ -987,15 +987,15 @@ var WindowManager = new Lang.Class({
 
         let mode = Shell.ActionMode.ALL & ~Shell.ActionMode.LOCK_SCREEN;
         gesture = new EdgeDragAction.EdgeDragAction(St.Side.BOTTOM, mode);
-        gesture.connect('activated', Lang.bind(this, function() {
+        gesture.connect('activated', () => {
             Main.keyboard.show(Main.layoutManager.bottomIndex);
-        }));
+        });
         global.stage.add_action(gesture);
     },
 
     _showPadOsd(display, device, settings, imagePath, editionMode, monitorIndex) {
         this._currentPadOsd = new PadOsd.PadOsd(device, settings, imagePath, editionMode, monitorIndex);
-        this._currentPadOsd.connect('closed', Lang.bind(this, function() { this._currentPadOsd = null }));
+        this._currentPadOsd.connect('closed', () => { this._currentPadOsd = null });
 
         return this._currentPadOsd.actor;
     },
@@ -1015,11 +1015,11 @@ var WindowManager = new Lang.Class({
     },
 
     _switchApp() {
-        let windows = global.get_window_actors().filter(Lang.bind(this, function(actor) {
+        let windows = global.get_window_actors().filter(actor => {
             let win = actor.metaWindow;
             return (!win.is_override_redirect() &&
                     win.located_on_workspace(global.screen.get_active_workspace()));
-        }));
+        });
 
         if (windows.length == 0)
             return;
@@ -1047,14 +1047,12 @@ var WindowManager = new Lang.Class({
 
         global.screen.append_new_workspace(false, global.get_current_time());
 
-        let windows = global.get_window_actors().map(function(winActor) {
-            return winActor.meta_window;
-        });
+        let windows = global.get_window_actors().map(a => a.meta_window);
 
         // To create a new workspace, we slide all the windows on workspaces
         // below us to the next workspace, leaving a blank workspace for us
         // to recycle.
-        windows.forEach(function(window) {
+        windows.forEach(window => {
             // If the window is attached to an ancestor, we don't need/want
             // to move it
             if (window.get_transient_for() != null)
@@ -1406,7 +1404,7 @@ var WindowManager = new Lang.Class({
 
     _hasAttachedDialogs(window, ignoreWindow) {
         var count = 0;
-        window.foreach_transient(function(win) {
+        window.foreach_transient(win => {
             if (win != ignoreWindow &&
                 win.is_attached_dialog() &&
                 win.get_transient_for() == window) {
@@ -1427,9 +1425,8 @@ var WindowManager = new Lang.Class({
             this._dimWindow(window);
         } else if (!shouldDim && window._dimmed) {
             window._dimmed = false;
-            this._dimmedWindows = this._dimmedWindows.filter(function(win) {
-                                                                 return win != window;
-                                                             });
+            this._dimmedWindows =
+                this._dimmedWindows.filter(win => win != window);
             this._undimWindow(window);
         }
     },
@@ -1469,7 +1466,8 @@ var WindowManager = new Lang.Class({
 
     _mapWindow(shellwm, actor) {
         actor._windowType = actor.meta_window.get_window_type();
-        actor._notifyWindowTypeSignalId = actor.meta_window.connect('notify::window-type', Lang.bind(this, function () {
+        actor._notifyWindowTypeSignalId =
+            actor.meta_window.connect('notify::window-type', () => {
                 let type = actor.meta_window.get_window_type();
                 if (type == actor._windowType)
                     return;
@@ -1481,12 +1479,12 @@ var WindowManager = new Lang.Class({
                 }
 
                 actor._windowType = type;
-        }));
-        actor.meta_window.connect('unmanaged', Lang.bind(this, function(window) {
+            });
+        actor.meta_window.connect('unmanaged', window => {
             let parent = window.get_transient_for();
             if (parent)
                 this._checkDimming(parent);
-        }));
+        });
 
         if (actor.meta_window.is_attached_dialog())
             this._checkDimming(actor.get_meta_window().get_transient_for());
@@ -1576,9 +1574,8 @@ var WindowManager = new Lang.Class({
             actor._notifyWindowTypeSignalId = 0;
         }
         if (window._dimmed) {
-            this._dimmedWindows = this._dimmedWindows.filter(function(win) {
-                                                                 return win != window;
-                                                             });
+            this._dimmedWindows =
+                this._dimmedWindows.filter(win => win != window);
         }
 
         if (window.is_attached_dialog())
@@ -1618,10 +1615,10 @@ var WindowManager = new Lang.Class({
 
             if (window.is_attached_dialog()) {
                 let parent = window.get_transient_for();
-                actor._parentDestroyId = parent.connect('unmanaged', Lang.bind(this, function () {
+                actor._parentDestroyId = parent.connect('unmanaged', () => {
                     Tweener.removeTweens(actor);
                     this._destroyWindowDone(shellwm, actor);
-                }));
+                });
             }
 
             Tweener.addTween(actor,
@@ -1940,11 +1937,11 @@ var WindowManager = new Lang.Class({
             if (this._workspaceSwitcherPopup == null) {
                 this._workspaceTracker.blockUpdates();
                 this._workspaceSwitcherPopup = new WorkspaceSwitcherPopup.WorkspaceSwitcherPopup();
-                this._workspaceSwitcherPopup.connect('destroy', Lang.bind(this, function() {
+                this._workspaceSwitcherPopup.connect('destroy', () => {
                     this._workspaceTracker.unblockUpdates();
                     this._workspaceSwitcherPopup = null;
                     this._isWorkspacePrepended = false;
-                }));
+                });
             }
             this._workspaceSwitcherPopup.display(direction, newWs.index());
         }

js/ui/windowMenu.js

@@ -31,48 +31,48 @@ var WindowMenu = new Lang.Class({
 
         let item;
 
-        item = this.addAction(_("Minimize"), Lang.bind(this, function(event) {
+        item = this.addAction(_("Minimize"), () => {
             window.minimize();
-        }));
+        });
         if (!window.can_minimize())
             item.setSensitive(false);
 
         if (window.get_maximized()) {
-            item = this.addAction(_("Unmaximize"), Lang.bind(this, function() {
+            item = this.addAction(_("Unmaximize"), () => {
                 window.unmaximize(Meta.MaximizeFlags.BOTH);
-            }));
+            });
         } else {
-            item = this.addAction(_("Maximize"), Lang.bind(this, function() {
+            item = this.addAction(_("Maximize"), () => {
                 window.maximize(Meta.MaximizeFlags.BOTH);
-            }));
+            });
         }
         if (!window.can_maximize())
             item.setSensitive(false);
 
-        item = this.addAction(_("Move"), Lang.bind(this, function(event) {
+        item = this.addAction(_("Move"), event => {
             window.begin_grab_op(Meta.GrabOp.KEYBOARD_MOVING, true, event.get_time());
-        }));
+        });
         if (!window.allows_move())
             item.setSensitive(false);
 
-        item = this.addAction(_("Resize"), Lang.bind(this, function(event) {
+        item = this.addAction(_("Resize"), event => {
             window.begin_grab_op(Meta.GrabOp.KEYBOARD_RESIZING_UNKNOWN, true, event.get_time());
-        }));
+        });
         if (!window.allows_resize())
             item.setSensitive(false);
 
         if (!window.titlebar_is_onscreen() && type != Meta.WindowType.DOCK && type != Meta.WindowType.DESKTOP) {
-            this.addAction(_("Move Titlebar Onscreen"), Lang.bind(this, function(event) {
+            this.addAction(_("Move Titlebar Onscreen"), () => {
                 window.shove_titlebar_onscreen();
-            }));
+            });
         }
 
-        item = this.addAction(_("Always on Top"), Lang.bind(this, function() {
+        item = this.addAction(_("Always on Top"), () => {
             if (window.is_above())
                 window.unmake_above();
             else
                 window.make_above();
-        }));
+        });
         if (window.is_above())
             item.setOrnament(PopupMenu.Ornament.CHECK);
         if (window.get_maximized() == Meta.MaximizeFlags.BOTH ||
@@ -86,12 +86,12 @@ var WindowMenu = new Lang.Class({
              window.is_on_primary_monitor())) {
             let isSticky = window.is_on_all_workspaces();
 
-            item = this.addAction(_("Always on Visible Workspace"), Lang.bind(this, function() {
+            item = this.addAction(_("Always on Visible Workspace"), () => {
                 if (isSticky)
                     window.unstick();
                 else
                     window.stick();
-            }));
+            });
             if (isSticky)
                 item.setOrnament(PopupMenu.Ornament.CHECK);
             if (window.is_always_on_all_workspaces())
@@ -100,24 +100,28 @@ var WindowMenu = new Lang.Class({
             if (!isSticky) {
                 let workspace = window.get_workspace();
                 if (workspace != workspace.get_neighbor(Meta.MotionDirection.LEFT)) {
-                     this.addAction(_("Move to Workspace Left"), Lang.bind(this, function(event) {
-                        window.change_workspace(workspace.get_neighbor(Meta.MotionDirection.LEFT));
-                    }));
+                    this.addAction(_("Move to Workspace Left"), () => {
+                        let dir = Meta.MotionDirection.LEFT;
+                        window.change_workspace(workspace.get_neighbor(dir));
+                    });
                 }
                 if (workspace != workspace.get_neighbor(Meta.MotionDirection.RIGHT)) {
-                     this.addAction(_("Move to Workspace Right"), Lang.bind(this, function(event) {
-                        window.change_workspace(workspace.get_neighbor(Meta.MotionDirection.RIGHT));
-                    }));
+                    this.addAction(_("Move to Workspace Right"), () => {
+                        let dir = Meta.MotionDirection.RIGHT;
+                        window.change_workspace(workspace.get_neighbor(dir));
+                    });
                 }
                 if (workspace != workspace.get_neighbor(Meta.MotionDirection.UP)) {
-                    this.addAction(_("Move to Workspace Up"), Lang.bind(this, function(event) {
-                        window.change_workspace(workspace.get_neighbor(Meta.MotionDirection.UP));
-                    }));
+                    this.addAction(_("Move to Workspace Up"), () => {
+                        let dir = Meta.MotionDirection.UP;
+                        window.change_workspace(workspace.get_neighbor(dir));
+                    });
                 }
                 if (workspace != workspace.get_neighbor(Meta.MotionDirection.DOWN)) {
-                     this.addAction(_("Move to Workspace Down"), Lang.bind(this, function(event) {
-                        window.change_workspace(workspace.get_neighbor(Meta.MotionDirection.DOWN));
-                    }));
+                    this.addAction(_("Move to Workspace Down"), () => {
+                        let dir = Meta.MotionDirection.DOWN;
+                        window.change_workspace(workspace.get_neighbor(dir));
+                    });
                 }
             }
         }
@@ -129,37 +133,48 @@ var WindowMenu = new Lang.Class({
 
             let monitorIndex = window.get_monitor();
 
-          let upMonitorIndex = screen.get_monitor_neighbor_index(monitorIndex, Meta.ScreenDirection.UP);
+            let dir = Meta.ScreenDirection.UP;
+            let upMonitorIndex =
+                screen.get_monitor_neighbor_index(monitorIndex, dir);
             if (upMonitorIndex != -1) {
-            this.addAction(_("Move to Monitor Up"), Lang.bind(this, function(event) {
+                this.addAction(_("Move to Monitor Up"), () => {
                     window.move_to_monitor(upMonitorIndex);
-            }));
+                });
             }
-          let downMonitorIndex = screen.get_monitor_neighbor_index(monitorIndex, Meta.ScreenDirection.DOWN);
+
+            dir = Meta.ScreenDirection.DOWN;
+            let downMonitorIndex =
+                screen.get_monitor_neighbor_index(monitorIndex, dir);
             if (downMonitorIndex != -1) {
-            this.addAction(_("Move to Monitor Down"), Lang.bind(this, function(event) {
+                this.addAction(_("Move to Monitor Down"), () => {
                     window.move_to_monitor(downMonitorIndex);
-            }));
+                });
             }
-          let leftMonitorIndex = screen.get_monitor_neighbor_index(monitorIndex, Meta.ScreenDirection.LEFT);
+
+            dir = Meta.ScreenDirection.LEFT;
+            let leftMonitorIndex =
+                screen.get_monitor_neighbor_index(monitorIndex, dir);
             if (leftMonitorIndex != -1) {
-            this.addAction(_("Move to Monitor Left"), Lang.bind(this, function(event) {
+                this.addAction(_("Move to Monitor Left"), () => {
                     window.move_to_monitor(leftMonitorIndex);
-            }));
+                });
             }
-          let rightMonitorIndex = screen.get_monitor_neighbor_index(monitorIndex, Meta.ScreenDirection.RIGHT);
+
+            dir = Meta.ScreenDirection.RIGHT;
+            let rightMonitorIndex =
+                screen.get_monitor_neighbor_index(monitorIndex, dir);
             if (rightMonitorIndex != -1) {
-            this.addAction(_("Move to Monitor Right"), Lang.bind(this, function(event) {
+                this.addAction(_("Move to Monitor Right"), () => {
                     window.move_to_monitor(rightMonitorIndex);
-            }));
+                });
             }
         }
 
         this.addMenuItem(new PopupMenu.PopupSeparatorMenuItem());
 
-        item = this.addAction(_("Close"), Lang.bind(this, function(event) {
+        item = this.addAction(_("Close"), event => {
             window.delete(event.get_time());
-        }));
+        });
         if (!window.can_close())
             item.setSensitive(false);
     }
@@ -191,10 +206,9 @@ var WindowMenuManager = new Lang.Class({
         this._manager = new PopupMenu.PopupMenuManager({ actor: Main.layoutManager.dummyCursor });
 
         this._sourceActor = new St.Widget({ reactive: true, visible: false });
-        this._sourceActor.connect('button-press-event', Lang.bind(this,
-            function() {
+        this._sourceActor.connect('button-press-event', () => {
             this._manager.activeMenu.toggle();
-            }));
+        });
         Main.uiGroup.add_actor(this._sourceActor);
     },
 
@@ -204,11 +218,10 @@ var WindowMenuManager = new Lang.Class({
 
         this._manager.addMenu(menu);
 
-        menu.connect('activate', function() {
+        menu.connect('activate', () => {
             window.check_alive(global.get_current_time());
         });
-        let destroyId = window.connect('unmanaged',
-            function() {
+        let destroyId = window.connect('unmanaged', () => {
             menu.close();
         });
 
@@ -218,13 +231,13 @@ var WindowMenuManager = new Lang.Class({
 
         menu.open(BoxPointer.PopupAnimation.NONE);
         menu.actor.navigate_focus(null, Gtk.DirectionType.TAB_FORWARD, false);
-        menu.connect('open-state-changed', Lang.bind(this, function(menu_, isOpen) {
+        menu.connect('open-state-changed', (menu_, isOpen) => {
             if (isOpen)
                 return;
 
             this._sourceActor.hide();
             menu.destroy();
             window.disconnect(destroyId);
-        }));
+        });
     }
 });

js/ui/workspace.js

@@ -89,7 +89,7 @@ var WindowCloneLayout = new Lang.Class({
     },
 
     vfunc_allocate(container, box, flags) {
-        container.get_children().forEach(Lang.bind(this, function (child) {
+        container.get_children().forEach(child => {
             let realWindow;
             if (child == container._delegate._windowClone)
                 realWindow = container._delegate.realWindow;
@@ -98,7 +98,7 @@ var WindowCloneLayout = new Lang.Class({
 
             child.allocate(this._makeBoxForWindow(realWindow.meta_window),
                            flags);
-        }));
+        });
     }
 });
 
@@ -139,12 +139,14 @@ var WindowClone = new Lang.Class({
 
         this._windowClone._updateId = this.metaWindow.connect('size-changed',
             Lang.bind(this, this._onRealWindowSizeChanged));
-        this._windowClone._destroyId = this.realWindow.connect('destroy', Lang.bind(this, function() {
+        this._windowClone._destroyId =
+            this.realWindow.connect('destroy', () => {
                 // First destroy the clone and then destroy everything
-            // This will ensure that we never see it in the _disconnectSignals loop
+                // This will ensure that we never see it in the
+                // _disconnectSignals loop
                 this._windowClone.destroy();
                 this.destroy();
-        }));
+            });
 
         this._updateAttachedDialogs();
         this._computeBoundingBox();
@@ -214,21 +216,21 @@ var WindowClone = new Lang.Class({
 
     _doAddAttachedDialog(metaWin, realWin) {
         let clone = new Clutter.Clone({ source: realWin });
-        clone._updateId = metaWin.connect('size-changed', Lang.bind(this, function() {
+        clone._updateId = metaWin.connect('size-changed', () => {
             this._computeBoundingBox();
             this.emit('size-changed');
-        }));
-        clone._destroyId = realWin.connect('destroy', Lang.bind(this, function() {
+        });
+        clone._destroyId = realWin.connect('destroy', () => {
             clone.destroy();
 
             this._computeBoundingBox();
             this.emit('size-changed');
-        }));
+        });
         this.actor.add_child(clone);
     },
 
     _updateAttachedDialogs() {
-        let iter = Lang.bind(this, function(win) {
+        let iter = win => {
             let actor = win.get_compositor_private();
 
             if (!actor)
@@ -239,7 +241,7 @@ var WindowClone = new Lang.Class({
             this._doAddAttachedDialog(win, actor);
             win.foreach_transient(iter);
             return true;
-        });
+        };
         this.metaWindow.foreach_transient(iter);
     },
 
@@ -262,7 +264,7 @@ var WindowClone = new Lang.Class({
     _computeBoundingBox() {
         let rect = this.metaWindow.get_frame_rect();
 
-        this.actor.get_children().forEach(function (child) {
+        this.actor.get_children().forEach(child => {
             let realWindow;
             if (child == this._windowClone)
                 realWindow = this.realWindow;
@@ -271,7 +273,7 @@ var WindowClone = new Lang.Class({
 
             let metaWindow = realWindow.meta_window;
             rect = rect.union(metaWindow.get_frame_rect());
-        }, this);
+        });
 
         // Convert from a MetaRectangle to a native JS object
         this._boundingBox = { x: rect.x, y: rect.y, width: rect.width, height: rect.height };
@@ -312,7 +314,7 @@ var WindowClone = new Lang.Class({
     },
 
     _disconnectSignals() {
-        this.actor.get_children().forEach(Lang.bind(this, function (child) {
+        this.actor.get_children().forEach(child => {
             let realWindow;
             if (child == this._windowClone)
                 realWindow = this.realWindow;
@@ -321,7 +323,7 @@ var WindowClone = new Lang.Class({
 
             realWindow.meta_window.disconnect(child._updateId);
             realWindow.disconnect(child._destroyId);
-        }));
+        });
     },
 
     _onRealWindowSizeChanged() {
@@ -373,14 +375,13 @@ var WindowClone = new Lang.Class({
 
             // A click cancels a long-press before any click handler is
             // run - make sure to not start a drag in that case
-            Meta.later_add(Meta.LaterType.BEFORE_REDRAW, Lang.bind(this,
-                function() {
+            Meta.later_add(Meta.LaterType.BEFORE_REDRAW, () => {
                 if (this._selected)
                     return;
                 let [x, y] = action.get_coords();
                 action.release();
                 this._draggable.startDrag(x, y, global.get_current_time(), this._dragTouchSequence);
-                }));
+            });
         } else {
             this.emit('show-chrome');
         }
@@ -450,11 +451,10 @@ var WindowOverlay = new Lang.Class({
         title.clutter_text.ellipsize = Pango.EllipsizeMode.END;
         windowClone.actor.label_actor = title;
 
-        this._updateCaptionId = metaWindow.connect('notify::title',
-            Lang.bind(this, function(w) {
+        this._updateCaptionId = metaWindow.connect('notify::title', w => {
             this.title.text = w.title;
             this.relayout(false);
-            }));
+        });
 
         let button = new St.Button({ style_class: 'window-close' });
         button._overlap = 0;
@@ -603,11 +603,10 @@ var WindowOverlay = new Lang.Class({
 
             // use an idle handler to avoid mapping problems -
             // see comment in Workspace._windowAdded
-            let id = Mainloop.idle_add(Lang.bind(this,
-                                            function() {
+            let id = Mainloop.idle_add(() => {
                 this._windowClone.emit('selected');
                 return GLib.SOURCE_REMOVE;
-                                            }));
+            });
             GLib.Source.set_name_by_id(id, '[gnome-shell] this._windowClone.emit');
         }
     },
@@ -990,9 +989,7 @@ var UnalignedLayoutStrategy = new Lang.Class({
 
     _sortRow(row) {
         // Sort windows horizontally to minimize travel distance
-        row.windows.sort(function(a, b) {
-            return a.realWindow.x - b.realWindow.x;
-        });
+        row.windows.sort((a, b) => a.realWindow.x - b.realWindow.x);
     },
 
     computeLayout(windows, layout) {
@@ -1161,10 +1158,10 @@ var Workspace = new Lang.Class({
         this._positionWindowsFlags = 0;
         this._positionWindowsId = 0;
 
-        this.actor.connect('notify::mapped', Lang.bind(this, function() {
+        this.actor.connect('notify::mapped', () => {
             if (this.actor.mapped)
                 this._syncActualGeometry();
-        }));
+        });
     },
 
     setFullGeometry(geom) {
@@ -1194,7 +1191,7 @@ var Workspace = new Lang.Class({
         if (!this._actualGeometry)
             return;
 
-        this._actualGeometryLater = Meta.later_add(Meta.LaterType.BEFORE_REDRAW, Lang.bind(this, function() {
+        this._actualGeometryLater = Meta.later_add(Meta.LaterType.BEFORE_REDRAW, () => {
             this._actualGeometryLater = 0;
             if (!this.actor.mapped)
                 return false;
@@ -1206,7 +1203,7 @@ var Workspace = new Lang.Class({
             this._updateWindowPositions(Main.overview.animationInProgress ? WindowPositionFlags.ANIMATE : WindowPositionFlags.NONE);
 
             return false;
-        }));
+        });
     },
 
     _lookupIndex(metaWindow) {
@@ -1247,12 +1244,12 @@ var Workspace = new Lang.Class({
         if (this._positionWindowsId > 0)
             return;
 
-        this._positionWindowsId = Meta.later_add(Meta.LaterType.BEFORE_REDRAW, Lang.bind(this, function() {
+        this._positionWindowsId = Meta.later_add(Meta.LaterType.BEFORE_REDRAW, () => {
             this._realRecalculateWindowPositions(this._positionWindowsFlags);
             this._positionWindowsFlags = 0;
             this._positionWindowsId = 0;
             return false;
-        }));
+        });
     },
 
     _realRecalculateWindowPositions(flags) {
@@ -1265,7 +1262,7 @@ var Workspace = new Lang.Class({
         if (clones.length == 0)
             return;
 
-        clones.sort(function(a, b) {
+        clones.sort((a, b) => {
             return a.metaWindow.get_stable_sequence() - b.metaWindow.get_stable_sequence();
         });
 
@@ -1366,7 +1363,11 @@ var Workspace = new Lang.Class({
 
     syncStacking(stackIndices) {
         let clones = this._windows.slice();
-        clones.sort(function (a, b) { return stackIndices[a.metaWindow.get_stable_sequence()] - stackIndices[b.metaWindow.get_stable_sequence()]; });
+        clones.sort((a, b) => {
+            let indexA = stackIndices[a.metaWindow.get_stable_sequence()];
+            let indexB = stackIndices[b.metaWindow.get_stable_sequence()];
+            return indexA - indexB;
+        });
 
         for (let i = 0; i < clones.length; i++) {
             let clone = clones[i];
@@ -1388,9 +1389,9 @@ var Workspace = new Lang.Class({
                            scale_y: scale,
                            time: Overview.ANIMATION_TIME,
                            transition: 'easeOutQuad',
-                           onComplete: Lang.bind(this, function() {
+                           onComplete: () => {
                                this._showWindowOverlay(clone, overlay);
-                           })
+                           }
                          });
 
         clone.overlay.relayout(true);
@@ -1492,14 +1493,13 @@ var Workspace = new Lang.Class({
         if (!win) {
             // Newly-created windows are added to a workspace before
             // the compositor finds out about them...
-            let id = Mainloop.idle_add(Lang.bind(this,
-                                            function () {
+            let id = Mainloop.idle_add(() => {
                 if (this.actor &&
                     metaWin.get_compositor_private() &&
                     metaWin.get_workspace() == this.metaWorkspace)
                     this._doAddWindow(metaWin);
                 return GLib.SOURCE_REMOVE;
-                                            }));
+            });
             GLib.Source.set_name_by_id(id, '[gnome-shell] this._doAddWindow');
             return;
         }
@@ -1839,24 +1839,20 @@ var Workspace = new Lang.Class({
 
         clone.connect('selected',
                       Lang.bind(this, this._onCloneSelected));
-        clone.connect('drag-begin',
-                      Lang.bind(this, function() {
+        clone.connect('drag-begin', () => {
             Main.overview.beginWindowDrag(clone.metaWindow);
             overlay.hide();
-                      }));
-        clone.connect('drag-cancelled',
-                      Lang.bind(this, function() {
+        });
+        clone.connect('drag-cancelled', () => {
             Main.overview.cancelledWindowDrag(clone.metaWindow);
-                      }));
-        clone.connect('drag-end',
-                      Lang.bind(this, function() {
+        });
+        clone.connect('drag-end', () => {
             Main.overview.endWindowDrag(clone.metaWindow);
             overlay.show();
-                      }));
-        clone.connect('size-changed',
-                      Lang.bind(this, function() {
+        });
+        clone.connect('size-changed', () => {
             this._recalculateWindowPositions(WindowPositionFlags.NONE);
-                      }));
+        });
 
         this.actor.add_actor(clone.actor);
 

js/ui/workspaceSwitcherPopup.js

@@ -32,9 +32,9 @@ var WorkspaceSwitcherPopup = new Lang.Class({
         this._childHeight = 0;
         this._childWidth = 0;
         this._timeoutId = 0;
-        this._list.connect('style-changed', Lang.bind(this, function() {
+        this._list.connect('style-changed', () => {
            this._itemSpacing = this._list.get_theme_node().get_length('spacing');
-                                                     }));
+        });
 
         this._list.connect('get-preferred-width', Lang.bind(this, this._getPreferredWidth));
         this._list.connect('get-preferred-height', Lang.bind(this, this._getPreferredHeight));

js/ui/workspaceThumbnail.js

@@ -70,12 +70,12 @@ var WindowClone = new Lang.Class({
 
         this.clone._updateId = this.metaWindow.connect('position-changed',
                                                        Lang.bind(this, this._onPositionChanged));
-        this.clone._destroyId = this.realWindow.connect('destroy', Lang.bind(this, function() {
+        this.clone._destroyId = this.realWindow.connect('destroy', () => {
             // First destroy the clone and then destroy everything
             // This will ensure that we never see it in the _disconnectSignals loop
             this.clone.destroy();
             this.destroy();
-        }));
+        });
         this._onPositionChanged();
 
         this.actor.connect('button-release-event',
@@ -94,7 +94,7 @@ var WindowClone = new Lang.Class({
         this._draggable.connect('drag-end', Lang.bind(this, this._onDragEnd));
         this.inDrag = false;
 
-        let iter = Lang.bind(this, function(win) {
+        let iter = win => {
             let actor = win.get_compositor_private();
 
             if (!actor)
@@ -106,7 +106,7 @@ var WindowClone = new Lang.Class({
             win.foreach_transient(iter);
 
             return true;
-        });
+        };
         this.metaWindow.foreach_transient(iter);
     },
 
@@ -155,9 +155,9 @@ var WindowClone = new Lang.Class({
 
         clone._updateId = metaDialog.connect('position-changed',
                                              Lang.bind(this, this._updateDialogPosition, clone));
-        clone._destroyId = realDialog.connect('destroy', Lang.bind(this, function() {
+        clone._destroyId = realDialog.connect('destroy', () => {
             clone.destroy();
-        }));
+        });
         this.actor.add_child(clone);
     },
 
@@ -175,7 +175,7 @@ var WindowClone = new Lang.Class({
     },
 
     _disconnectSignals() {
-        this.actor.get_children().forEach(function(child) {
+        this.actor.get_children().forEach(child => {
             let realWindow = child.source;
 
             realWindow.meta_window.disconnect(child._updateId);
@@ -277,10 +277,10 @@ var WorkspaceThumbnail = new Lang.Class({
         let monitor = Main.layoutManager.primaryMonitor;
         this.setPorthole(monitor.x, monitor.y, monitor.width, monitor.height);
 
-        let windows = global.get_window_actors().filter(Lang.bind(this, function(actor) {
+        let windows = global.get_window_actors().filter(actor => {
             let win = actor.meta_window;
             return win.located_on_workspace(metaWorkspace);
-        }));
+        });
 
         // Create clones for windows that should be visible in the Overview
         this._windows = [];
@@ -337,7 +337,11 @@ var WorkspaceThumbnail = new Lang.Class({
     },
 
     syncStacking(stackIndices) {
-        this._windows.sort(function (a, b) { return stackIndices[a.metaWindow.get_stable_sequence()] - stackIndices[b.metaWindow.get_stable_sequence()]; });
+        this._windows.sort((a, b) => {
+            let indexA = stackIndices[a.metaWindow.get_stable_sequence()];
+            let indexB = stackIndices[b.metaWindow.get_stable_sequence()];
+            return indexA - indexB;
+        });
 
         for (let i = 0; i < this._windows.length; i++) {
             let clone = this._windows[i];
@@ -393,14 +397,13 @@ var WorkspaceThumbnail = new Lang.Class({
         if (!win) {
             // Newly-created windows are added to a workspace before
             // the compositor finds out about them...
-            let id = Mainloop.idle_add(Lang.bind(this,
-                                       function () {
+            let id = Mainloop.idle_add(() => {
                 if (!this._removed &&
                     metaWin.get_compositor_private() &&
                     metaWin.get_workspace() == this.metaWorkspace)
                     this._doAddWindow(metaWin);
                 return GLib.SOURCE_REMOVE;
-                                        }));
+            });
             GLib.Source.set_name_by_id(id, '[gnome-shell] this._doAddWindow');
             return;
         }
@@ -523,22 +526,18 @@ var WorkspaceThumbnail = new Lang.Class({
     _addWindowClone(win) {
         let clone = new WindowClone(win);
 
-        clone.connect('selected',
-                      Lang.bind(this, function(clone, time) {
+        clone.connect('selected', (clone, time) => {
             this.activate(time);
-                      }));
-        clone.connect('drag-begin',
-                      Lang.bind(this, function() {
+        });
+        clone.connect('drag-begin', () => {
             Main.overview.beginWindowDrag(clone.metaWindow);
-                      }));
-        clone.connect('drag-cancelled',
-                      Lang.bind(this, function() {
+        });
+        clone.connect('drag-cancelled', () => {
             Main.overview.cancelledWindowDrag(clone.metaWindow);
-                      }));
-        clone.connect('drag-end',
-                      Lang.bind(this, function() {
+        });
+        clone.connect('drag-end', () => {
             Main.overview.endWindowDrag(clone.metaWindow);
-                      }));
+        });
         this._contents.add_actor(clone.actor);
 
         if (this._windows.length == 0)
@@ -651,7 +650,7 @@ var ThumbnailsBox = new Lang.Class({
 
         this._thumbnails = [];
 
-        this.actor.connect('button-press-event', function() { return Clutter.EVENT_STOP; });
+        this.actor.connect('button-press-event', () => Clutter.EVENT_STOP);
         this.actor.connect('button-release-event', Lang.bind(this, this._onButtonRelease));
         this.actor.connect('touch-event', Lang.bind(this, this._onTouchEvent));
 
@@ -677,11 +676,11 @@ var ThumbnailsBox = new Lang.Class({
         this._settings.connect('changed::dynamic-workspaces',
             Lang.bind(this, this._updateSwitcherVisibility));
 
-        Main.layoutManager.connect('monitors-changed', Lang.bind(this, function() {
+        Main.layoutManager.connect('monitors-changed', () => {
             this._destroyThumbnails();
             if (Main.overview.visible)
                 this._createThumbnails();
-        }));
+        });
     },
 
     _updateSwitcherVisibility() {
@@ -910,9 +909,8 @@ var ThumbnailsBox = new Lang.Class({
     },
 
     _workspacesChanged() {
-        let validThumbnails = this._thumbnails.filter(function(t) {
-            return t.state <= ThumbnailState.NORMAL;
-        });
+        let validThumbnails =
+            this._thumbnails.filter(t => t.state <= ThumbnailState.NORMAL);
         let oldNumWorkspaces = validThumbnails.length;
         let newNumWorkspaces = global.screen.n_workspaces;
         let active = global.screen.get_active_workspace_index();
@@ -1043,19 +1041,17 @@ var ThumbnailsBox = new Lang.Class({
             return;
 
         // Then slide out any thumbnails that have been destroyed
-        this._iterateStateThumbnails(ThumbnailState.REMOVING,
-            function(thumbnail) {
+        this._iterateStateThumbnails(ThumbnailState.REMOVING, thumbnail => {
             this._setThumbnailState(thumbnail, ThumbnailState.ANIMATING_OUT);
 
             Tweener.addTween(thumbnail,
                              { slidePosition: 1,
                                time: SLIDE_ANIMATION_TIME,
                                transition: 'linear',
-                                   onComplete() {
+                               onComplete: () => {
                                    this._setThumbnailState(thumbnail, ThumbnailState.ANIMATED_OUT);
                                    this._queueUpdateStates();
-                                   },
-                                   onCompleteScope: this
+                               }
                              });
         });
 
@@ -1064,15 +1060,14 @@ var ThumbnailsBox = new Lang.Class({
             return;
 
         // Once that's complete, we can start scaling to the new size and collapse any removed thumbnails
-        this._iterateStateThumbnails(ThumbnailState.ANIMATED_OUT,
-            function(thumbnail) {
+        this._iterateStateThumbnails(ThumbnailState.ANIMATED_OUT, thumbnail => {
             this.actor.set_skip_paint(thumbnail.actor, true);
             this._setThumbnailState(thumbnail, ThumbnailState.COLLAPSING);
             Tweener.addTween(thumbnail,
                              { collapseFraction: 1,
                                time: RESCALE_ANIMATION_TIME,
                                transition: 'easeOutQuad',
-                                   onComplete() {
+                               onComplete: () => {
                                    this._stateCounts[thumbnail.state]--;
                                    thumbnail.state = ThumbnailState.DESTROYED;
 
@@ -1081,8 +1076,7 @@ var ThumbnailsBox = new Lang.Class({
                                    thumbnail.destroy();
 
                                    this._queueUpdateStates();
-                                   },
-                                   onCompleteScope: this
+                               }
                              });
         });
 
@@ -1096,17 +1090,15 @@ var ThumbnailsBox = new Lang.Class({
             return;
 
         // And then slide in any new thumbnails
-        this._iterateStateThumbnails(ThumbnailState.NEW,
-            function(thumbnail) {
+        this._iterateStateThumbnails(ThumbnailState.NEW, thumbnail => {
             this._setThumbnailState(thumbnail, ThumbnailState.ANIMATING_IN);
             Tweener.addTween(thumbnail,
                              { slidePosition: 0,
                                time: SLIDE_ANIMATION_TIME,
                                transition: 'easeOutQuad',
-                                   onComplete() {
+                               onComplete: () => {
                                    this._setThumbnailState(thumbnail, ThumbnailState.NORMAL);
-                                   },
-                                   onCompleteScope: this
+                               }
                              });
         });
     },
@@ -1235,9 +1227,9 @@ var ThumbnailsBox = new Lang.Class({
         let y = box.y1;
 
         if (this._dropPlaceholderPos == -1) {
-            Meta.later_add(Meta.LaterType.BEFORE_REDRAW, Lang.bind(this, function() {
+            Meta.later_add(Meta.LaterType.BEFORE_REDRAW, () => {
                 this._dropPlaceholder.hide();
-            }));
+            });
         }
 
         let childBox = new Clutter.ActorBox();
@@ -1264,9 +1256,9 @@ var ThumbnailsBox = new Lang.Class({
                 childBox.y1 = Math.round(y);
                 childBox.y2 = Math.round(y + placeholderHeight);
                 this._dropPlaceholder.allocate(childBox, flags);
-                Meta.later_add(Meta.LaterType.BEFORE_REDRAW, Lang.bind(this, function() {
+                Meta.later_add(Meta.LaterType.BEFORE_REDRAW, () => {
                     this._dropPlaceholder.show();
-                }));
+                });
                 y += placeholderHeight + spacing;
             }
 

js/ui/workspacesView.js

@@ -112,11 +112,10 @@ var WorkspacesView = new Lang.Class({
         this._updateWorkspacesId = global.screen.connect('notify::n-workspaces', Lang.bind(this, this._updateWorkspaces));
 
         this._overviewShownId =
-            Main.overview.connect('shown',
-                                 Lang.bind(this, function() {
+            Main.overview.connect('shown', () => {
                 this.actor.set_clip(this._fullGeometry.x, this._fullGeometry.y,
                                     this._fullGeometry.width, this._fullGeometry.height);
-        }));
+            });
 
         this._switchWorkspaceNotifyId =
             global.window_manager.connect('switch-workspace',
@@ -200,11 +199,10 @@ var WorkspacesView = new Lang.Class({
                 // matter which tween we use, so we pick the first one ...
                 if (w == 0) {
                     this._updateVisibility();
-                    params.onComplete = Lang.bind(this,
-                        function() {
+                    params.onComplete = () => {
                         this._animating = false;
                         this._updateVisibility();
-                        });
+                    };
                 }
                 Tweener.addTween(workspace.actor, params);
             } else {
@@ -241,10 +239,9 @@ var WorkspacesView = new Lang.Class({
             value: index,
             time: WORKSPACE_SWITCH_TIME,
             transition: 'easeOutQuad',
-            onComplete: Lang.bind(this,
-                                  function() {
+            onComplete: () => {
                 this._animatingScroll = false;
-                                  })
+            }
         });
     },
 
@@ -421,7 +418,7 @@ var WorkspacesDisplay = new Lang.Class({
         this.actor.connect('parent-set', Lang.bind(this, this._parentSet));
 
         let clickAction = new Clutter.ClickAction();
-        clickAction.connect('clicked', Lang.bind(this, function(action) {
+        clickAction.connect('clicked', action => {
             // Only switch to the workspace when there's no application
             // windows open. The problem is that it's too easy to miss
             // an app window and get the wrong one focused.
@@ -430,13 +427,13 @@ var WorkspacesDisplay = new Lang.Class({
             if ((action.get_button() == 1 || action.get_button() == 0) &&
                 this._workspacesViews[index].getActiveWorkspace().isEmpty())
                 Main.overview.hide();
-        }));
+        });
         Main.overview.addAction(clickAction);
         this.actor.bind_property('mapped', clickAction, 'enabled', GObject.BindingFlags.SYNC_CREATE);
 
         let panAction = new Clutter.PanAction({ threshold_trigger_edge: Clutter.GestureTriggerEdge.AFTER });
         panAction.connect('pan', Lang.bind(this, this._onPan));
-        panAction.connect('gesture-begin', Lang.bind(this, function() {
+        panAction.connect('gesture-begin', () => {
             if (this._workspacesOnlyOnPrimary) {
                 let event = Clutter.get_current_event();
                 if (this._getMonitorIndexForEvent(event) != this._primaryIndex)
@@ -446,17 +443,17 @@ var WorkspacesDisplay = new Lang.Class({
             for (let i = 0; i < this._workspacesViews.length; i++)
                 this._workspacesViews[i].startSwipeScroll();
             return true;
-        }));
-        panAction.connect('gesture-cancel', Lang.bind(this, function() {
+        });
+        panAction.connect('gesture-cancel', () => {
             clickAction.release();
             for (let i = 0; i < this._workspacesViews.length; i++)
                 this._workspacesViews[i].endSwipeScroll();
-        }));
-        panAction.connect('gesture-end', Lang.bind(this, function() {
+        });
+        panAction.connect('gesture-end', () => {
             clickAction.release();
             for (let i = 0; i < this._workspacesViews.length; i++)
                 this._workspacesViews[i].endSwipeScroll();
-        }));
+        });
         Main.overview.addAction(panAction);
         this.actor.bind_property('mapped', panAction, 'enabled', GObject.BindingFlags.SYNC_CREATE);
 
@@ -615,8 +612,7 @@ var WorkspacesDisplay = new Lang.Class({
             oldParent.disconnect(this._notifyOpacityId);
         this._notifyOpacityId = 0;
 
-        Meta.later_add(Meta.LaterType.BEFORE_REDRAW, Lang.bind(this,
-            function() {
+        Meta.later_add(Meta.LaterType.BEFORE_REDRAW, () => {
             let newParent = this.actor.get_parent();
             if (!newParent)
                 return;
@@ -624,16 +620,15 @@ var WorkspacesDisplay = new Lang.Class({
             // This is kinda hackish - we want the primary view to
             // appear as parent of this.actor, though in reality it
             // is added directly to Main.layoutManager.overviewGroup
-                this._notifyOpacityId = newParent.connect('notify::opacity',
-                    Lang.bind(this, function() {
+            this._notifyOpacityId = newParent.connect('notify::opacity', () => {
                 let opacity = this.actor.get_parent().opacity;
                 let primaryView = this._getPrimaryView();
                 if (!primaryView)
                     return;
                 primaryView.actor.opacity = opacity;
                 primaryView.actor.visible = opacity != 0;
-                    }));
-        }));
+            });
+        });
     },
 
     // This geometry should always be the fullest geometry

tests/interactive/background-size.js

@@ -35,7 +35,7 @@ function test() {
         if (useCairo)
             obin.style = 'border: 3px solid green;';
         else
-            obin.connect_after('paint', function(actor) {
+            obin.connect_after('paint', actor => {
                 Cogl.set_source_color4f(0, 1, 0, 1);
 
                 let geom = actor.get_allocation_geometry();

tests/interactive/box-shadow-animated.js

@@ -62,14 +62,14 @@ function test() {
 
     resize_animated(label1);
     resize_animated(label2);
-    Mainloop.timeout_add(DELAY, Lang.bind(this, function() {
+    Mainloop.timeout_add(DELAY, () => {
         log(label1 + label1.get_size());
         resize_animated(label1);
         resize_animated(label2);
         return true;
-    }));
+    });
 
-    Mainloop.timeout_add(2 * DELAY, Lang.bind(this, function() {
+    Mainloop.timeout_add(2 * DELAY, () => {
         iter += 1;
         iter %= shadowStyles.length;
         label1.set_style(get_css_style(shadowStyles[iter]));
@@ -77,7 +77,7 @@ function test() {
         label2.set_style(get_css_style(shadowStyles[iter]));
         label2.set_text(shadowStyles[iter]);
         return true;
-    }));
+    });
 
     UI.main(stage);
 }