Nodejs Utililty Methods Array Shuffle

Array.prototype.shuffle = function() {
  this.push(this.shift());
  return this;

Array.prototype.shuffle = function () {
  for (var rnd, tmp, i = this.length; i; rnd = parseInt(Math.random() * i),
      tmp = this[--i], this[i] = this[rnd], this[rnd] = tmp);
};

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 i = this.length;
     while (--i) {
        var j = Math.floor(Math.random() * (i + 1));
        var temp = this[i];
        this[i] = this[j];
        this[j] = temp;
   return this;
...

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

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

Array.prototype.shuffle = function() {
    for (var j, x, i = this.length - 1; i; j = randomNumber(i), x = this[--i], this[i] = this[j], this[j] = x);
    return this;
};

Array.prototype.shuffle = function () {
    var c = this.slice(0);
    for (var j, x, i = this.length; i; j = parseInt(Math.random() * i), x = this[--i], this[i] = this[j], this[j] = x);
    if (this.compare(c)) {
        this.shuffle();
    return this;
}; 

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

Array.prototype.shuffle = function(){
  var counter = this.length, temp, index;
  while (counter > 0) {
    index = (Math.random() * counter--) | 0;
    temp = this[counter];
    this[counter] = this[index];
    this[index] = temp;
  return this;
...