Nodejs Utililty Methods Array Shuffle

Array.prototype.shuffle = function(){
  for (var i = 0; i < this.length; i++){
      var a = this[i];
      var b = Math.floor(Math.random() * this.length);
      this[i] = this[b];
      this[b] = a;
function shuffleProperties(obj) {
...

Array.prototype.shuffle = function () {
    let array = this, arraylength = array.length, randomIndex, temp;
    while (arraylength) {
        randomIndex = Math.floor(Math.random(arraylength) * arraylength--);
        temp = array[arraylength];
        array[arraylength] = array[randomIndex];
        array[randomIndex] = temp;
    return array;
...

'use strict';
Array.prototype.shuffle = function() {
  var arr = this.slice(0);
  var counter = this.length,
    temp, index;
  while (counter > 0) {
    index = Math.floor(Math.random() * counter);
    counter--;
    temp = arr[counter];
...

Array.prototype.shuffle=function() {
  this.sort(function() {return Math.random()-0.5; });

Array.prototype.shuffle = function() {
var s = [];
while (this.length) s.push(this.splice(Math.random() * this.length, 1)[0]);
while (s.length) this.push(s.pop());
return this;

Array.prototype.shuffle = function(){
  var i=this.length,j,t;
  while(i--)
    j=Math.floor((i+1)*Math.random());
    t=this[i];
    this[i]=this[j];
    this[j]=t;
  return this;
};

Array.prototype.shuffle = function () {
  var l = this.length + 1;
  while (l--) {
    var r   = ~~(Math.random() * l), o = this[r];
    this[r] = this[0];
    this[0] = o;
  return this;
};
...

Array.prototype.shuffle = function() {
    var currentIndex = this.length, temporaryValue, randomIndex;
    while (0 !== currentIndex) {
        randomIndex = Math.floor(Math.random() * currentIndex);
        currentIndex -= 1;
        temporaryValue = this[currentIndex];
        this[currentIndex] = this[randomIndex];
        this[randomIndex] = temporaryValue;
    return this;

Array.prototype.shuffle = function() {
  var ar=this;
for(var j, x, i = ar.length; i; j = parseInt(Math.random() * i), x = ar[--i], ar[i] = ar[j], ar[j] = x);
    return ar;

Array.prototype.shuffle = function() {
  var i = this.length, j, temp;
  while(--i > 0) {
    j = Math.floor(Math.random() * (i+1));
    temp = this[j];
    this[j] = this[i];
    this[i] = temp;
  return this;
...