Nodejs Array Shuffle shuffle()

Method Source Code

// Fisher Yates Shuffle Algorithm

Array.prototype.shuffle = function() {
  var i = this.length
  var j//from  ww  w .  j a va  2  s .  c o  m
  var temp

  if (i > 1) {
    while (--i) {
      j = Math.floor(Math.random() * (i + 1))
      temp = this[i]
      this[i] = this[j]
      this[j] = temp
    }
  }
  return this
}

Related

1. shuffle()

   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);
   };
   

2. shuffle()

   Array.prototype.shuffle = function() { 
       var arr = this, elm, inc, length = arr.length;
       while (length) {
           inc = Math.floor(Math.random() * length--);
           elm = arr[length];
           arr[length] = arr[inc];
           arr[inc] = elm;
       return arr; 
   ...
   

3. shuffle()

   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;
   };
   ...
   

4. shuffle()

   Array.prototype.shuffle = function() {
     var m = this.length, i;
     while (m) {
       i = (Math.random() * m--) >>> 0;
       [this[m], this[i]] = [this[i], this[m]]
     return this;
   };
   

5. shuffle()

   Array.prototype.shuffle = function () {
       var newArr = [];
       for (var i = 0; i < this.length; i++) {
           var currElem = this[i];
           var rand = Math.floor(Math.random() * this.length);
           this[i] = this[rand];
           this[rand] = currElem;
       return this;
   ...
   

6. shuffle()

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

7. 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});
   };
   

8. shuffle()

   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;
   ...
   

9. shuffle()

   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;
   ...