Nodejs Array Shuffle shuffle()

Method Source Code

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--;/*from  w w  w . j a v  a2s  .c  om*/

            temp = this[counter];
            this[counter] = this[index];
            this[index] = temp;
        }

        return this;
    };
}

Array.prototype.contains = function(i, f) {
    return this.indexOf(i, f) > -1;
};

Related

1. shuffle()

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

2. 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;
   };
   

3. shuffle()

   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; 
   ...
   

4. shuffle()

   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];
   ...
   

5. 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;
     return this;
   

6. shuffle()

   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;
   ...
   

7. shuffle()

   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];
   ...
   

8. shuffle()

   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;
   };
   

9. shuffle()

   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;
   };