Nodejs Utililty Methods Array Shuffle

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;
};

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 array = this.slice();
  var current = this.length;
  var temp;
  var random;
  while(current !== 0) {
    random = Math.floor(Math.random() * current);
    current -= 1;
    temp = array[current];
...

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;

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

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 () {
            var self = this,
                n = self.length,
                i,
                j,
                tmp;
            for (i = n - 1; i > 0; i -= 1) {
                j = Math.floor(Math.random() * (i + 1));
                tmp = self[i];
...

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

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

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;
};
...