Nodejs Array Shuffle shuffle()

Method Source Code

Array.prototype.shuffle=function(){
   // Fisher-Yates
   var i=this.length;
   if (i==0) return;
   while (--i){/*  ww w  . j av  a 2 s .co m*/
      var rand=Math.floor(Math.random()*(i+1));
      tempI=this[i];
      tempRand=this[rand];
      this[i]=tempRand;
      this[rand]=tempI;
   }
};
arrayReturnRandom=function(arr,count){
   arr.shuffle();
   var randArr=[];
   if (!count) count=1;
   for (i=0;i<count;i++){
      randArr.push(arr[i]);
   }
   return randArr;
};

Related

1. 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
   ...
   

2. shuffle()

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

3. 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;
   ...
   

4. shuffle()

   Array.prototype.shuffle = function() {
       var swapbucket = this.length, randomelem, tempswap, tempelem;
       while (swapbucket--) {
           randomelem = Math.floor(Math.random() * (swapbucket + 1));
           tempelem = this[randomelem];
           tempswap = this[swapbucket];
           this[randomelem] = tempswap;
           this[swapbucket] = tempelem;
   

5. shuffle()

   Array.prototype.shuffle = function() {
       var counter = this.length, temp, index;
       while (counter--) {
           index = (Math.random() * counter) | 0;
           temp = this[counter];
           this[counter] = this[index];
           this[index] = temp;
   };
   ...
   

6. shuffle()

   Array.prototype.shuffle = function(){
       var index1 = this.length, index2, temporary;
       while (--index1 > 0){
           index2 = Math.floor(Math.random() * (index1 + 1));
           temporary = this[index2];
           array[index2] = this[index1];
           array[index1] = temporary;
       return this;
   ...
   

7. 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];
   ...
   

8. shuffle()

   Array.prototype.shuffle = function (){
       var temp,
       rand,
       round = Math.floor((Math.random() * (this.length*2)) + this.length);
       for (var i =0 ; round> i ; i++){
           rand = Math.floor(Math.random() * this.length);
           temp = this[rand];
           this.splice(rand, 1);
           this.push(temp);
   ...
   

9. shuffle()

   Array.prototype.shuffle = function(){
       var index1 = this.length, index2, temporary;
       while (--index1 > 0){
           index2 = Math.floor(Math.random() * (index1 + 1));
           temporary = this[index2];
           array[index2] = this[index1];
           array[index1] = temporary;
       return this;
   ...