1function randomArrayShuffle(array) {
2  var currentIndex = array.length, temporaryValue, randomIndex;
3  while (0 !== currentIndex) {
4    randomIndex = Math.floor(Math.random() * currentIndex);
5    currentIndex -= 1;
6    temporaryValue = array[currentIndex];
7    array[currentIndex] = array[randomIndex];
8    array[randomIndex] = temporaryValue;
9  }
10  return array;
11}
12var alphabet=["a","b","c","d","e"];
13randomArrayShuffle(alphabet); 
14//alphabet is now shuffled randomly = ["d", "c", "b", "e", "a"]
15
16
17

1// O(n)
2function shuffleArray(array) {
3    for (let i = array.length - 1; i > 0; i--) {
4        const j = Math.floor(Math.random() * (i + 1));
5        [array[i], array[j]] = [array[j], array[i]];
6    }
7}

1/**
2 * Shuffles array in place.
3 * @param {Array} a items An array containing the items.
4 */
5function shuffle(a) {
6    var j, x, i;
7    for (i = a.length - 1; i > 0; i--) {
8        j = Math.floor(Math.random() * (i + 1));
9        x = a[i];
10        a[i] = a[j];
11        a[j] = x;
12    }
13    return a;
14}
15
16
17/**
18 * Shuffles array in place. ES6 version
19 * @param {Array} a items An array containing the items.
20 */
21function shuffle(a) {
22    for (let i = a.length - 1; i > 0; i--) {
23        const j = Math.floor(Math.random() * (i + 1));
24        [a[i], a[j]] = [a[j], a[i]];
25    }
26    return a;
27}
28
29var myArray = ['1','2','3','4','5','6','7','8','9'];
30shuffle(myArray);