Nodejs Array Random random_item()

Method Source Code

'use strict';//from   ww  w.ja va 2s . c  om

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);
    messages.appendChild(newline);
};

Related

1. randomElement()

   Array.prototype.randomElement = function () {
       return this[Math.floor(Math.random() * this.length)]
   };
   function shuffle(array) {
     var currentIndex = array.length, temporaryValue, randomIndex ;
     while (0 !== currentIndex) {
       randomIndex = Math.floor(Math.random() * currentIndex);
       currentIndex -= 1;
       temporaryValue = array[currentIndex];
   ...
   

2. randomPick()

   Array.prototype.randomPick = function () {
       return this[_.random(this.length - 1)];
   };
   

3. randomPick()

   Array.prototype.randomPick = function () {
       return this[Math.floor(Math.random()*this.length)];
   };
   

4. randomPick()

   Array.prototype.randomPick = function() {
     var index = Math.floor(Math.random() * this.length);
     return this[index];
   

5. randomRemove()

   Array.prototype.randomRemove = function () {
     return this.splice(Math.floor(Math.random() * this.length), 1)[0];
   

6. randomise()

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

7. 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;
   

8. 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;
   

9. 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);
   ...