Best overall shuffling algorithm (browser tests only)[https://jsperf.com/array-shuffle-comparator/9] #toolbox

byReference.js

// **WARNING**
// in place (by reference) reordering
// http://stackoverflow.com/a/2450976/1037948
function knuthfisheryates2(arr) {
	var temp, j, i = arr.length;
	while (--i) {
		j = ~~(Math.random() * (i + 1));
		temp = arr[i];
		arr[i] = arr[j];
		arr[j] = temp;
	}
	return arr;
}

newArray.js

// http://stackoverflow.com/a/2450976/1037948
function knuthfisheryates2(arr) {
	var j, i = arr.length, next = new Array(i);
	while (--i) {
		j = ~~(Math.random() * (i + 1));
		next[i] = arr[j];
	}
	return next;
}