Nodejs Array Shuffle shuffle()

Method Source Code

Array.prototype.shuffle = function() {

   var i = this.length, j, temp;
   //from  w w  w  .  ja v a 2 s.c o m
   while(--i > 0) {
      j = Math.floor(Math.random() * (i+1));
      temp = this[j];
      this[j] = this[i];
      this[i] = temp;
   }
   
   return this;
}

// fisher yates algorithm
var arr = [1,2,3,4,5,6,7,8]
var result = arr.shuffle();

console.log(result);

Related

1. shuffle()

   Array.prototype.shuffle = function() {
       for (i = this.length - 1; i > 0; i--) {
           var temp = this[i];
           var random = Math.floor(Math.random() * (i + 1));
           this[i] = this[random];
           this[random] = temp;
       return this;
   };
   ...
   

2. shuffle()

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

3. 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;
   };
   

4. shuffle()

   Array.prototype.shuffle = function() {
     let input = this;
     for (let i = input.length - 1; i >= 0; i--) {
       let randomIndex = Math.floor(Math.random() * (i + 1));
       let itemAtIndex = input[randomIndex];
       input[randomIndex] = input[i];
       input[i] = itemAtIndex;
     return input;
   ...
   

5. shuffle()

   Array.prototype.shuffle =  function() {
     var i, j, t;
     for (i = 1; i < this.length; i++) {
       j = Math.floor(Math.random()*(1+i));  
       if (j != i) {
         t = this[i];                        
         this[i] = this[j];
         this[j] = t;
   

6. shuffle()

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

7. 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;
   };
   

8. 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;
   };
   

9. shuffle()

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