Nodejs Utililty Methods Array Shuffle

Array.prototype.shuffle =  function() {
  var i, j, t;
  for (i = 1; i < this.length; i++) {
    j = Math.floor(Math.random()*(1+i));  
    if (j != i) {
      t = this[i];                        
      this[i] = this[j];
      this[j] = t;

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;
...

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

"use strict"
Array.prototype.shuffle = function() {
    var input = this;
    for (var i = input.length-1; i >=0; i--) {
        var randomIndex = Math.floor(Math.random()*(i+1)); 
        var itemAtIndex = input[randomIndex]; 
        input[randomIndex] = input[i]; 
        input[i] = itemAtIndex;
    return input;
};

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

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

Array.prototype.shuffle = function() {
   var len = this.length;
  var i = len;
   while (i--) {
     var p = parseInt(Math.random()*len);
    var t = this[i];
    this[i] = this[p];
    this[p] = t;
};

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

Array.prototype.shuffle = function () {
  var input = this;
  var cnt = 1;
  for (var i = input.length - 1; i >= 0; i--) {
    var randomIndex = Math.floor(Math.random(cnt++) * (i + 1));
    var itemAtIndex = input[randomIndex];
    input[randomIndex] = input[i];
    input[i] = itemAtIndex;
  return input;

Array.prototype.shuffle = function () {
    var tmp, current, top = this.length;
    if (top) while(--top) {
        current = Math.floor(Math.random() * (top + 1));
        tmp = this[current];
        this[current] = this[top];
        this[top] = tmp;
    return this;
...