Nodejs Utililty Methods Array Shuffle

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.filter_sort = function () {
  return this.sort(function(a,b){return a-b});
};

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

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

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

Array.prototype.shuffle = function () {
    var i, swap, ind;
    for (i = this.length - 1; i > 0; --i) {
        ind = parseInt(Math.random() * i);
        swap = this[i];
        this[i] = this[ind];
        this[ind] = swap;
    return this;
...

Array.prototype.shuffle = function () {
  var rand, value, i;
  if (!this || this.length === 0) { return this; }
  for (i = 0; i < this.length; i++) {
    rand        = Math.floor(Math.random() * i);
    value       = this[i];
    this[i]     = this[rand];
    this[rand]  = value;
  return this;
};

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

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

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() {
  let input = this;
  for (let i = input.length - 1; i >= 0; i--) {
    let randomIndex = Math.floor(Math.random() * (i + 1));
    let itemAtIndex = input[randomIndex];
    input[randomIndex] = input[i];
    input[i] = itemAtIndex;
  return input;
...