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dash: Fix some JS warnings

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We currently use "array[index]" to test whether an array has an
element at index before using it. However nowadays gjs warns about
accessing non-existent array elements, so the test itself already
produces a warning. Avoid this by checking the array length before
using an index to access an element.

https://bugzilla.gnome.org/show_bug.cgi?id=781471
This commit is contained in:
Florian Müllner 2017-06-13 03:41:42 +02:00
parent e2f88d67f7
commit 2a01606c59
1 changed files with 14 additions and 12 deletions
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26
js/ui/dash.js
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@ -756,42 +756,44 @@ const Dash = new Lang.Class({
let newIndex = 0;
let oldIndex = 0;
while (newIndex < newApps.length || oldIndex < oldApps.length) {
let oldApp = oldApps.length > oldIndex ? oldApps[oldIndex] : null;
let newApp = newApps.length > newIndex ? newApps[newIndex] : null;
// No change at oldIndex/newIndex
if (oldApps[oldIndex] == newApps[newIndex]) {
if (oldApp == newApp) {
oldIndex++;
newIndex++;
continue;
}
// App removed at oldIndex
if (oldApps[oldIndex] &&
newApps.indexOf(oldApps[oldIndex]) == -1) {
if (oldApp && newApps.indexOf(oldApp) == -1) {
removedActors.push(children[oldIndex]);
oldIndex++;
continue;
}
// App added at newIndex
if (newApps[newIndex] &&
oldApps.indexOf(newApps[newIndex]) == -1) {
addedItems.push({ app: newApps[newIndex],
item: this._createAppItem(newApps[newIndex]),
if (newApp && oldApps.indexOf(newApp) == -1) {
addedItems.push({ app: newApp,
item: this._createAppItem(newApp),
pos: newIndex });
newIndex++;
continue;
}
// App moved
let insertHere = newApps[newIndex + 1] &&
newApps[newIndex + 1] == oldApps[oldIndex];
let nextApp = newApps.length > newIndex + 1 ? newApps[newIndex + 1]
: null;
let insertHere = nextApp && nextApp == oldApp;
let alreadyRemoved = removedActors.reduce(function(result, actor) {
let removedApp = actor.child._delegate.app;
return result || removedApp == newApps[newIndex];
return result || removedApp == newApp;
}, false);
if (insertHere || alreadyRemoved) {
let newItem = this._createAppItem(newApps[newIndex]);
addedItems.push({ app: newApps[newIndex],
let newItem = this._createAppItem(newApp);
addedItems.push({ app: newApp,
item: newItem,
pos: newIndex + removedActors.length });
newIndex++;