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 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...
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;...
oops - incorrectly posted  apologize to all.  misread my code and misinterpreted its behavior.    source code  have page in which variable shoe is initialized twice, once in index.html and once in an included script.js:  index.html  <script src=&#...
I am having trouble printing a simple array list in javascript. undefined is being printed before only two array items. please consider the code below;    function buildList(){     var box = document.getElementById("box"); 	var startList  = &...
What is the correct way to initialize Date in EcmaScript5.  Here is what I am trying to do:  //18.02.09 12:00 - 18.02.11 24:00  var StartTime = new Date("2018-02-09T12:00:00.000Z").getTime();  var EndTime = new Date("2018-02-11T23:59:00.0...
Reading through the docs, I see that you can replace the constructor for Backbone's extend on a model class. But what's the difference between doing this vs. doing it on the initialize method? Aren't both called when you use new?  var Lib...
How can I correctly do refinement on an uninitialized variable of a ?T or T|undefined type?  What makes uninitialized variable different from a value of undefined?  Neither throws an error, however in the below case:  const test = (nums: Array<num...
I created a simple registration (sign-up) form for my website.  The form includes a few validity checks (such as : making sure that the email is in the correct format; making sure that the username does not already exist in the database; etc, etc)  A...

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