Nodejs Array Shuffle shuffle()

Method Source Code

Array.prototype.shuffle = function() {
    var i = this.length, j, temp;
    while ( --i > 0 ) {
        j = Math.floor( Math.random() * ( i +1 ));
        temp = this [j];//from w ww.j av  a 2s  .  c o m
        this [j] = this [i];
        this [i] = temp;
    }
    return this;
};
var array =[ 'A' , 'B' , 'C' , 'D' , 'E' , 'F' , 'G' , 'H' ];
var result = array.shuffle();
console.log( result );

Related

1. shuffle()

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

2. 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;
   };
   

3. 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;
   ...
   

4. shuffle()

   Array.prototype.shuffle = function () {
     var input = this;
     var cnt = 1;
     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;
   

5. 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;
   ...
   

6. 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;
   ...
   

7. shuffle()

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

8. shuffle()

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

9. shuffle()

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