gistfile1.js

        //Randomizes the playlist and then saves it.
        shuffle: function () {
            var i, j, t;
            for (i = 1; i < playlist.songs.length; i++) {
                j = Math.floor(Math.random() * (1 + i));  // choose j in [0..i]
                if (j !== i) {
                    t = playlist.songs[i];                        // swap songs[i] and songs[j]
                    playlist.songs[i] = playlist.songs[j];
                    playlist.songs[j] = t;
                }
            }

            save();
        }