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JSPerf: The javascript comma operator vs. semicolon operator

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var generateUsers = function(x){

    var lastnames = ['Brown', 'Black', 'Green', 'Aaberg', 'Aagard', 'Abdella', 'Abebe', 'Caccamo', 'Caccavale', 'Caccese', 'Cacchione', 'Caccia', 'Cacciatore', 'Easley', 'Easlick', 'Easom', 'Eason', 'East', 'Eastburn', 'Ines', 'Infante', 'Infanti', 'Infantino', 'Infield','Infinger', 'Kaliszewski', 'Kalita', 'Kalivas', 'Kalivoda', 'Kalk', 'Kalka', 'Umpleby', 'Umscheid', 'Umstead', 'Umsted', 'Un', 'Unangst', 'Zediker', 'Zee', 'Zeeb', 'Zeedyk', 'Zeek', 'Zeeman'];
    var firstnames = ['Mohamed', 'Youssef', 'Ahmed', 'Mahmoud', 'Mustafa', 'Yassin', 'Taha', 'Khaled', 'Hamza', 'Bilal', 'Ibrahim', 'Hassan', 'Hussein', 'Karim', 'Tareq', 'Abdel-Rahman', 'Ali', 'Omar', 'Halim', 'Murad', 'Selim', 'Abdallah', 'Alex', 'Alexander', 'Carter', 'Charlie', 'David', 'Jackson', 'James', 'Jase', 'Joseph', 'Wyatt', 'Charles', 'Clark', 'Cooper', 'Daniel', 'Drake', 'Dylan', 'Edward', 'Eli', 'Elijah', 'Emerson', 'Evan', 'Felix', 'Gabriel', 'Gavin', 'Gus', 'Isaac', 'Isaiah', 'Jacob', 'Jax', 'Kai', 'Kai

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myAwesomeApp
|-client
| |-lib #Only Client libraries
| |-js
| |-templates
|-collections #Define, Publish & Subscribe collections
|-lib #Isomorphic (Client + Server) libraries
|-public (or static) #files & folders avaliable via http
| |-css
| |-other

dr-dimitru

var symbols = '23456789QWERTYUPASDFGHJKZXCVBNM';
var qty = 1500000;
var length = 7;
var code, hash, i, maxIndex, rand, symbol, _i, _j;
maxIndex = symbols.length - 1;
for (i = _i = 1; 1 <= qty ? _i <= qty : _i >= qty; i = 1 <= qty ? ++_i : --_i) {
  code = 'KX ';
  hash = 0;
  for (symbol = _j = 1; 1 <= length ? _j <= length : _j >= length; symbol = 1 <= length ? ++_j : --_j) {
    rand = Math.floor((Math.random() * maxIndex) + 1);

dr-dimitru

JSPerf: localStorage square bracket syntax vs. methods

dr-dimitru

JSPerf: Array toString join

dr-dimitru

JSPerf: Fastest way to concatenate a string

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/*jshint strict:false */

/*
 * @function
 * @namespace String.prototype
 * @name clone
 * 
 * @description Clone (a.k.a. create singleton) of String object
 * This method allows to resolve issue with variable's referencing
 * See performance here: http://jsperf.com/clone-create-singleton-for-string-object

dr-dimitru

/*
 * @function
 * @name Object.defineReactiveProperty
 * @description define Reactive property:
 *      - set callback before Setter and Getter
 *      - set callback on Setter
 *      - set callback on Getter
 *
 * @param {object} target       - Object on which we define a property
 * @param {string} prop         - Name of defining property

dr-dimitru

/*
 * @function
 * @name Object.prototype.inArray
 * @description Extend Object prototype within inArray function
 *
 * @param {mix}    needle       - Search-able needle
 * @param {bool}   searchInKey  - Search needle in keys?
 *
 */
Object.defineProperty(Object.prototype, 'inArray',{