Which method of checking if a variable has been initialized is better/correct? (Assuming the variable could hold anything (string, int, object, function, etc.))  if (elem) { // or !elem   or  if (typeof(elem) !== 'undefined') {   or  if (el...
I was looking over the jQuery to better understand how it works. The constructor basically just calls   new jQuery.fn.init   I was wondering what is the point of having the init inside jQuery's prototype? Wouldn't defining init() as part of t...
I have a quick question about tinyMCE. I have a textarea, with id="mainbuffer", and the function tinyMCE.get(id).setContent(data).  ONLY works when it is called onclick="function()" from a link and does not work when I load the page....
I read about a static constructor in typescript and tried it myself but it doesn't work. I want to initialize a static variable by that - The method shall only be called once.  Error: 'static' modifier cannot appear on a constructor decla...
This pattern is quite common; I've seen it in a few places including the jQuery source code:  var arr = "word1 word2 word3".split(" ");   as an alternative to the 'normal' methods of array initiliasation:  var arr1 = [ &#...
I am aware that most common practice would be to put var a,b; on the top, but I want to extract every possible character (after running on JS Uglify), and it seems they don't delete unnecessary var initializing  I want to know if any of the follo...
I'd like to initialize an object in javascript calling directly a method that belongs to it:    var obj = (function(){       return{           init: function(){               console.log("initialized!");               return this;...
I am looking for something like the $(document).ready function in jQuery, as I work on experimenting with using Closure.  So, my question is simple, is there a function I am missing that will allow me to wait until my function is called when the DOM...
So I want to declare a javascript array with multiple fields.   For example I know you can do something like  var data = [ {     "field one": "a",     "field two": "b", }, {       "field one": "c",...
Initializing a map having string keys can be performed as following in Javascript:  var xxx = {     "aaa" : ["a1","a2","a3"],     "bbb" : ["b1","b2","b3"],     "ccc" : ["c1&#...

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