Nodejs Array Random randomize()

Method Source Code

Array.prototype.randomize = function(){

   var size = this.length;
   var itensInArray = 0;
   var newArray = [];
   var emptyObject = {}; //used to mark unique replaceable space

   this.forEach(function(){ newArray.push(emptyObject); }); //create a new array with same size and fill with emptyObject

   this.forEach(function(item){

      var index = Math.randomInt(0, size - 1);
      //from  w  ww  . j av  a 2  s.c o  m
      while(newArray[index] != emptyObject) {
         index += 1;
         index %= size;
      }

      itensInArray++;
      newArray[index] = item;

   });

   return newArray;
}

Array.prototype.contains = function(element) {
   for(var i = 0; i < this.length; i++){
    if( element === this[i] ) return true;
   }
   return false;
};

Related

1. randomise()

   Array.prototype.randomise = function() {
       return this.sort(function() { return 0.5 - Math.random() });
   

2. randomize()

   Array.prototype.randomize = function() {
     var result = [];
     while (this.length) {
       var index = this.indexOf(this.random());
       result.push(this.splice(index, 1)[0]);
     return result;
   

3. randomize()

   Array.prototype.randomize = Array.prototype.randomize || function() {
     var result = [];
     var clone = this.slice();
     while (clone.length) {
       var index = clone.indexOf(clone.random());
       result.push(clone.splice(index, 1)[0]);
     return result;
   

4. randomize()

   Array.prototype.randomize = function() {
       if (this.length < 2) {
           return this;
       var items = Array.from(this);
       var newArr = [];
       while (items.length > 0) {
           var entry = items.random();
           newArr.push(entry);
   ...
   

5. randomize()

   function range(from, to) {
     var result = []
     for(var i = from; i <= to; i++) {
       result.push(i)
     return result
   Array.prototype.randomize = function() {
     this.sort(function(){ return (Math.round(Math.random()) - 0.5) })
   ...
   

6. randomize()

   Array.prototype.randomize = function() {
     this.sort(function() {
       return Math.floor(Math.random() * 2) ? -1 : 1;
     });
     return this;
   

7. randomize()

   Array.prototype.randomize = 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;
   ...