shuffle.js
Randomly shuffle an array.
Works in all modern browsers, and at least back to IE9.
/**
* Randomly shuffle an array
* https://stackoverflow.com/a/2450976/1293256
* @param {Array} array The array to shuffle
* @return {String} The first item in the shuffled array
*/
var shuffle = function (array) {
var currentIndex = array.length;
var temporaryValue, randomIndex;
// While there remain elements to shuffle...
while (0 !== currentIndex) {
// Pick a remaining element...
randomIndex = Math.floor(Math.random() * currentIndex);
currentIndex -= 1;
// And swap it with the current element.
temporaryValue = array[currentIndex];
array[currentIndex] = array[randomIndex];
array[randomIndex] = temporaryValue;
}
return array;
};