Nodejs Array Shuffle shuffle()

Method Source Code

/**//ww  w.  j a  v a  2s . c o  m
@Name: Array.prototype.shuffle
@Author: Paul Visco
@Version: 1.1 11/19/07
@Description: Shuffle the values in an array randomly
@Param: values Array If passed an array of values, all the values in the argument array are removed from the array being manipulated
@Param: value Object/String/Number If a single object, string, number, etc is passed to the function than only that value is removed.
@Return: Array Returns the array minus the values that were specified for removal.
@Example:
var myArray = [5, 10, 15];
myArray.shuffle();
//myArray =[10, 15, 5]; //<-could change each time
*/
Array.prototype.shuffle = function(){
   var i=this.length,j,t;
   
   while(i--)
   {
      j=Math.floor((i+1)*Math.random());
      t=this[i];
      this[i]=this[j];
      this[j]=t;
   }
   return this;
};

Related

1. shuffle()

   Array.prototype.shuffle = function(){
     for (var i = 0; i < this.length; i++){
         var a = this[i];
         var b = Math.floor(Math.random() * this.length);
         this[i] = this[b];
         this[b] = a;
   function shuffleProperties(obj) {
   ...
   

2. shuffle()

   Array.prototype.shuffle = function () {
       let array = this, arraylength = array.length, randomIndex, temp;
       while (arraylength) {
           randomIndex = Math.floor(Math.random(arraylength) * arraylength--);
           temp = array[arraylength];
           array[arraylength] = array[randomIndex];
           array[randomIndex] = temp;
       return array;
   ...
   

3. shuffle()

   'use strict';
   Array.prototype.shuffle = function() {
     var arr = this.slice(0);
     var counter = this.length,
       temp, index;
     while (counter > 0) {
       index = Math.floor(Math.random() * counter);
       counter--;
       temp = arr[counter];
   ...
   

4. shuffle()

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

5. shuffle()

   Array.prototype.shuffle = function() {
   var s = [];
   while (this.length) s.push(this.splice(Math.random() * this.length, 1)[0]);
   while (s.length) this.push(s.pop());
   return this;
   

6. shuffle()

   Array.prototype.shuffle = function () {
     var l = this.length + 1;
     while (l--) {
       var r   = ~~(Math.random() * l), o = this[r];
       this[r] = this[0];
       this[0] = o;
     return this;
   };
   ...
   

7. 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;
   

8. shuffle()

   Array.prototype.shuffle = function() {
     var ar=this;
   for(var j, x, i = ar.length; i; j = parseInt(Math.random() * i), x = ar[--i], ar[i] = ar[j], ar[j] = x);
       return ar;
   

9. 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;
   ...