Nodejs Array Shuffle shuffleArray(arr)

Method Source Code

Math.shuffleArray = function(arr)
{
   // Fisher-yates, http://sedition.com/perl/javascript-fy.html
   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;//from   w ww  .  j  a  v  a2  s .com
   arr[j] = tempi;
   }
   return arr;
}

Related

1. shuffle(n)

   Array.prototype.shuffle = function (n) {
       var params = [].slice.call(arguments);
       var index = -1,
           result = this,
           length = result.length,
           lastIndex = length - 1;
       while (++index < n) {
           var rand = index + Math.floor(Math.random() * (lastIndex - index + 1));
               value = result[rand];
   ...
   

2. 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;
   ...
   

3. 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);
   

4. shuffled()

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

5. 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;
   ...
   

6. doShuffle()

   Array.prototype.doShuffle = function() {
     var j, x, i;
     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();
   ...