Nodejs Array Shuffle shuffle()

Method Source Code

// Knuth shuffle//from w  w w  .ja  va  2s .c o m
// - source: http://www.htmlblog.us/random-javascript-array
Array.prototype.shuffle = function() {
  var i = this.length,
      j,
      temp;

  while( --i ) {
    j = Math.floor( Math.random() * (i - 1) );
    temp = this[i];
    this[i] = this[j];
    this[j] = temp;
  }
}

Related

1. shuffle()

   Array.prototype.shuffle = function() {
     var m = this.length, i;
     while (m) {
       i = (Math.random() * m--) >>> 0;
       [this[m], this[i]] = [this[i], this[m]]
     return this;
   };
   

2. shuffle()

   Array.prototype.shuffle = function () {
       var newArr = [];
       for (var i = 0; i < this.length; i++) {
           var currElem = this[i];
           var rand = Math.floor(Math.random() * this.length);
           this[i] = this[rand];
           this[rand] = currElem;
       return this;
   ...
   

3. shuffle()

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

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() {
      var len = this.length;
     var i = len;
      while (i--) {
        var p = parseInt(Math.random()*len);
       var t = this[i];
       this[i] = this[p];
       this[p] = t;
   };
   Array.prototype.filter_sort = function () {
     return this.sort(function(a,b){return a-b});
   };
   

6. 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;
   ...
   

7. 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;
   ...
   

8. shuffle()

   Array.prototype.shuffle = function () {
       var i, swap, ind;
       for (i = this.length - 1; i > 0; --i) {
           ind = parseInt(Math.random() * i);
           swap = this[i];
           this[i] = this[ind];
           this[ind] = swap;
       return this;
   ...
   

9. shuffle()

   Array.prototype.shuffle = function () {
     var rand, value, i;
     if (!this || this.length === 0) { return this; }
     for (i = 0; i < this.length; i++) {
       rand        = Math.floor(Math.random() * i);
       value       = this[i];
       this[i]     = this[rand];
       this[rand]  = value;
     return this;
   };