Nodejs Array Shuffle doShuffle()

Method Source Code

Array.prototype.doShuffle = function() {
   var j, x, i;//from ww  w  . j av  a2 s . co  m
   for(i = this.length-1; i >= 0; --i) {
      j = Math.floor(Math.random() * i);
      x = this[i]; this[i] = this[j]; this[j] = x;
   }
};
Array.prototype.shuffle = function() {
   var r = this.slice();
   r.doShuffle();
   return r;
};

Related

1. shuffle(times)

   Array.prototype.shuffle = function(times) {
       if(undefined === times) times = this.length * 2;
       var temp;
       while(times--) {
           var a = Number.random(0, this.length - 1);
           var b = Number.random(0, this.length - 1);
           temp = this[a];
           this[a] = this[b];
           this[b] = temp;
   ...
   

2. shuffleMe()

   Array.prototype.shuffleMe = function() {
       var array_length = this.length;
       var loop_no = array_length;
       while (--loop_no > 0) {
           var random_number = Math.floor(Math.random() * (loop_no + 1));
           var value = this[random_number];
           this[random_number] = this[loop_no];
           this[loop_no] = value;
       return this;
   var array = ['A', 'B', 'C', 'D', 'E', 'F', 'G', 'H'];
   var result = array.shuffleMe();
   console.log(result);
   

3. shuffled()

   Array.prototype.shuffled = function() {
     return this.map(function(n){ return [Math.random(), n] })
                .sort().map(function(n){ return n[1] });
   };
   

4. shuffle(myArray)

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

5. shuffleArray(arr)

   Math.shuffleArray = function(arr)
     var i = arr.length;
     if ( i == 0 ) return false;
     while ( --i ) {
     var j = Math.floor( Math.random() * ( i + 1 ) );
     var tempi = arr[i];
     var tempj = arr[j];
     arr[i] = tempj;
   ...