Nodejs Array Shuffle shuffle()

Method Source Code

//this method adds a shuffle routine to the javascript array
Array.prototype.shuffle = function () {
   var input = this;
   var cnt = 1;/*from w  ww.j  av  a  2s.com*/
   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;
}

Related

1. shuffle()

   "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;
   };
   

2. shuffle()

   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;
   };
   

3. shuffle()

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

4. 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;
   };
   

5. shuffle()

   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;
   ...
   

6. shuffle()

   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;
   ...
   

7. shuffle()

   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;
   ...
   

8. shuffle()

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

9. shuffle()

   Array.prototype.shuffle = function()
     for(var i=0; i<this.length; i++)
       this.swap(i, parseInt(Math.random() * this.length));
   };