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    <p>By using <a href="https://developer.spotify.com/docs/apps/api/1.0/api-models-promise.html" rel="nofollow">Promises</a> you can delay the rendering of the list until you have successfully composed the temporary list with your tracks. Also, in order to prevent the addition of repeated tracks on reload, assign a unique name to your temporary playlist.</p> <pre><code>require([ '$api/models', '$views/list#List', '$api/toplists#Toplist' ], function (models, List, Toplist) { 'use strict'; // Build playlist function buildList(trackURIArray) { var arr = trackURIArray; models.Playlist .createTemporary("myTempList_" + new Date().getTime()) .done(function (playlist) { playlist.load("tracks").done(function () { playlist.tracks.add.apply(playlist.tracks, arr).done(function () { // Create list var list = List.forCollection(playlist, { style: 'rounded' }); $('#playlistContainer').appendChild(list.node); list.init(); }); }); }); } // Get top track function getTopTrack(artist, num) { var promise = new models.Promise(); var artistTopList = Toplist.forArtist(artist); artistTopList.tracks.snapshot(0, num).done(function (snapshot) { snapshot.loadAll().done(function (tracks) { promise.setDone(tracks[0]); }).fail(function (f) { promise.setFail(f); }); }); return promise; } // Get Related function getRelated(artist_uri) { models.Artist .fromURI(artist_uri) .load('related') .done(function (artist) { artist.related.snapshot().done(function (snapshot) { snapshot.loadAll().done(function (artists) { var promises = []; for (var i = 0; i &lt; artists.length; i++) { var promise = getTopTrack(artists[i], 1); promises.push(promise); } models.Promise.join(promises) .done(function (tracks) { console.log('Loaded all tracks', tracks); }) .fail(function (tracks) { console.error('Failed to load at least one track.', tracks); }) .always(function (tracks) { // filter out results from failed promises buildList(tracks.filter(function(t) { return t !== undefined; })); }); }); }); }); } getRelated('spotify:artist:2VAvhf61GgLYmC6C8anyX1'); }); </code></pre>
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    1. COThis worked great. So basically, you are creating a new promise for every top track, joining them, and then creating a list based on this newly joined array?
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    2. COThat's it. The `Promise.join` callback is called when all the promises have been resolved, and receives an array with all the returned values.
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    3. COHad another question about clearing the playlists when I use drag/drop. http://stackoverflow.com/questions/19898092/spotify-clear-playlist-drag-and-drop
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