Nodejs Array Shuffle shuffle()

Method Source Code

Array.prototype.shuffle = function() {
    var a = this;
    var j, x, i;/*from   w w w  . java2 s. co  m*/
    for (i = a.length; i; i -= 1) {
        j = Math.floor(Math.random() * i);
        x = a[i - 1];
        a[i - 1] = a[j];
        a[j] = x;
    }

    return a;
};

Related

1. shuffle( b )

   Array.prototype.shuffle = function( b )
     var i = this.length, j, t;
     while( i )
       j = Math.floor( ( i-- ) * Math.random() );
       t = b && typeof this[i].shuffle!=='undefined' ? this[i].shuffle() : this[i];
       this[i] = this[j];
       this[j] = t;
   ...
   

2. shuffle()

   Array.prototype.shuffle = function () {
     return this.sort((a, b) => Math.random() > 0.5 ? 1 : -1)
   

3. shuffle()

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

4. shuffle()

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

5. shuffle()

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

6. shuffle()

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