I was perusing the underscore.js library and I found something I haven't come across before:  if (obj.length === +obj.length) { ... }   What is that + operator doing there? For context, here is a direct link to that part of the file....
I found the following code in a JS project:  var a = new Array(); a[0] = 0; for (var b = 0; b < 10; b++) {   a[0] |= b;  }   What does the |= do in the body of the for loop?  The code example is dubious, but has been presented here by V8 for an ex...
I'm trying to understand how the comma operator (,) works in JavaScript, it seems to have a different behaviour when it's not put between parenthesis.   Can someone explain me why ?   Exemple for reference :     var a = 1;  var b = 2;  var c...
Sorry, I'm a bit of a noob when it comes to javascript. But here is my problem: The following function returns -1 when 0 is inputed  function foo(bar){     return bar || -1; }  foo(0);   is there a nice and elegant way to allow the || operator to...
If I put this line into JavaScript console (you do not need to declare "foo")  foo : 4;   What exactly this line means? Does "foo" live in any context? Is : any operator?...
I just encountered the code below.  var loadComplete = 0; window.onload = function(){     loadComplete |= 1; };   I've never seen "|=" like operator. Also I have googled about it, but there seems to be no example of it....
EDIT: I have to make this work on IE11  I have the following code:  span.classList.add(span.textContent === '\ ' ? 'char' : 'spaceChar')   It is working fine, but I would like to add 2 classes in case it's true, something...
Okay, so this might be a little awkward to explain.  My function is given an element to target, and takes an ID displayed in the element using innerHTML. That ID also then appears in the name of a class, which must also be targeted. However, the ID h...
What does means by following expression please give any reference for expression like that in javascript   var variable= somevalue!== undefined;    Thanks Vishal...
var color3 = {     name: 'Black',     type: 'special',     rating: 1 };  var rateColor3 = (colorName, Nrating) => ({ ...colorName, Nrating }); console.log(color3.rating); ///// 1 console.log(rateColor3(color3, 6).rating);//////1 co...

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