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...
var id = $(this).children().html();  // id is 5 $.ajax({    url: 'ajax.php?id=' + id,    success: function(data) {       id = data;   // id is 1    } }); if(id == 1){    // id is again 5    ... }   Why in the following example I can't rei...
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'm having an issue with trying to populate a multidimensional object in javascript before all of the dimensions are defined.  For example this is what I want to do:  var multiVar = {}; var levelone = 'one'; var leveltwo = 'two';...
I am trying to set a variable initially only if it has not been set. For some reason the logic I'm using to determine whether the variable has been set seems to run even regardless of whether the variable has been set.  My code is   var l0 = -210...
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'm looking for a better way to manage global component/plugin/widget initialization in a large project. It has many jQuery-powered components that I would like to initialize quickly & efficiently and after scouring the internet, I've onl...
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...

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