Nodejs Array Shuffle shuffle()

Method Source Code

// shuffles (randomizes an array)
// e.g. myArray.shuffle()
Array.prototype.shuffle = function() {
  var currentIndex = this.length, temporaryValue, randomIndex;
  while (0 !== currentIndex) {
    randomIndex = Math.floor(Math.random() * currentIndex);
    currentIndex -= 1;/*from  w w  w .j a va2s  . com*/
    temporaryValue = this[currentIndex];
    this[currentIndex] = this[randomIndex];
    this[randomIndex] = temporaryValue;
  }
  return this;
}

// returns a deck of cards
// e.g. getDeck()
window.getDeck = function() {
  var ranks = [2, 3, 4, 5, 6, 7, 8, 9, 10, 'jack', 'queen', 'king', 'ace'];
  var suits = ['clubs', 'diamonds', 'hearts', 'spades'];
  var cards = [];
  ranks.forEach(function(rank, index) {
    suits.forEach(function(suit, index) {
      cards.push(rank + "_of_" + suit);
    });
  });
  return cards;
}

Related

1. shuffle()

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

2. 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;
   

3. shuffle()

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

4. shuffle()

   var binarySearch = function(needle, haystack) {
       var low = 0,
           high = haystack.length - 1;
       haystack.sort(function(x, y) {
           return x - y;
       });
       while (low <= high) {
           var middle = Math.floor((low + high) / 2);
           if (needle === haystack[middle])
   ...
   

5. 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;
   };
   

6. 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;
   };
   ...
   

7. shuffle()

   Array.prototype.shuffle = function() {
       var i = this.length;
         while(i){
             var j = Math.floor(Math.random()*i);
             var t = this[--i];
             this[i] = this[j];
             this[j] = t;
         return this;
   ...
   

8. shuffle()

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

9. shuffle()

   Array.prototype.shuffle = function() {
       for (var i = 0; i < this.length; i++) {
           var j = Math.floor(Math.random() * (this.length - i) + i);
           var temp = this[i];
           this[i] = this[j];
           this[j] = temp;
   };
   String.prototype.capitalise = function() {
   ...