Nodejs Array Random randomize()

Method Source Code

function range(from, to) {
  var result = []
  for(var i = from; i <= to; i++) {
    result.push(i)/*from   www.j ava 2s  . co  m*/
  }
  return result
}

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

Array.prototype.toStringWithoutBrackets = Array.prototype.toString
Array.prototype.toString = function() {
  return '['+this.toStringWithoutBrackets()+']'
}

Array.prototype.swap = function(a, b) {
  var tmp = this[a]
  this[a] = this[b]
  this[b] = tmp
}

Array.prototype.first = function() {
  if(this.length > 0) {
    return this[0]  
  } else {
    return null
  }
}

Array.prototype.rest = function() {
  if(this.length > 0) {
    return this.slice(1)
  } else {
    return []
  }
}

Array.prototype.last = function() {
  if(this.length > 0) {
    return this[this.length - 1]  
  } else {
    return null
  }
}

Array.prototype.append = function(array) {
  this.push.apply(this, array)
  return this
}

Related

1. random_item()

   'use strict';
   Array.prototype.random_item = function () {
       return this[Math.floor(Math.random() * this.length)];
   };
   var printError = function (msg) {
       var newline = document.createElement('br');
       var content = document.createTextNode(msg);
       var messages = document.getElementById('messages');
       messages.appendChild(content);
   ...
   

2. randomise()

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

3. 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;
   

4. 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;
   

5. 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);
   ...
   

6. randomize()

   Array.prototype.randomize = function(){
     var size = this.length;
     var itensInArray = 0;
     var newArray = [];
     var emptyObject = {}; 
     this.forEach(function(){ newArray.push(emptyObject); }); 
     this.forEach(function(item){
       var index = Math.randomInt(0, size - 1);
       while(newArray[index] != emptyObject) {
   ...
   

7. randomize()

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

8. 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;
   ...