Fix infinite recursion + minor cleanup

src/js/HuesCore.js

@@ -420,13 +420,14 @@ HuesCore.prototype.fillBuildup = function() {
 };
 
 HuesCore.prototype.randomSong = function() {
-    var index=Math.floor((Math.random() * this.resourceManager.enabledSongs.length));
-    if (index == this.songIndex && this.resourceManager.enabledSongs.length > 1 || this.lastSongArray.indexOf(index) != -1) {
+    var songCount = this.resourceManager.enabledSongs.length;
+    var index=Math.floor((Math.random() * songCount));
+    if (songCount > 1 && (index == this.songIndex || this.lastSongArray.indexOf(index) != -1)) {
         this.randomSong();
     } else {
         console.log("Randoming a song!");
         this.setSong(index);
-        var noRepeat = Math.min(5, Math.floor((this.resourceManager.enabledSongs.length / 2)));
+        var noRepeat = Math.min(5, Math.floor(songCount / 2));
         while (this.lastSongArray.length > noRepeat && noRepeat >= 0) {
             this.lastSongArray.shift();
         }

src/js/ResourceManager.js

@@ -88,7 +88,7 @@ Resources.prototype.addAll = function(urls, progressCallback) {
     var respackPromises = []
     for(var i = 0; i < urls.length; i++) {
         r = new Respack();
-        (function(r) {
+        ((r) => {
             respackPromises.push(r.loadFromURL(urls[i], function(index, progress, pack) {
                     this.progressState[index] = progress;
                     this.updateProgress(pack);
@@ -804,7 +804,7 @@ Resources.prototype.remoteProgress = function(progress, respack) {
     }
 };
 
-Resources.prototype.remoteComplete = function(progress) {
+Resources.prototype.remoteComplete = function() {
     var progStat = this.packsView.progressStatus;
     progStat.textContent = "Complete";
     window.setTimeout(function() {progStat.textContent = "Idle";}, 2000);