The primitive types (number, string, etc.) are passed by value, but objects are unknown, because they can be both passed-by-value (in case we consider that a variable holding an object is in fact a reference to the object) and passed-by-reference (...

All my unit tests have some common code I can run and abstract into a function. However I want to be able to re-use the Core value in every test  function makeSuite(name, module, callback) {     suite(name, function () {         var Core = {};...

I just found out the hard way objects are passed by reference in Javascript, for example:  for(var layer = 0; layer < hudLayers['layers'].length; layer++){      // Store the to-be-calculated values in this object     var tempValues = hudLa...

In my React-Redux app, I am changing the redux state and it looks something like this  state {     key1: oldVal1     key2: oldArray1 //The value here is an array     .     .     . }   Now when I update the state next time...  state {     key1: newVal...

I was trying to understand passing of variables and objects in JavaScript, and came across this page.  It is explained that JavaScript objects are passed by value, but the value itself is a reference. Though I understood what was happening in the exa...

Given an object obj, I can modify its properties by using something like obj.a.b.c = "new value". However, I want to be able to do this programmatically, with the property's location in the form of an array. How can I make a function that...

We all know JS has objects and a group of primitives.  Let's examine the following assignments.  a = 'foo'; b = a; c = 'foo' a === b; //true a = b = c = undefined;   The way I visualize the variable assignment process in JS for ye...

Can anyone tell me why all the object.num's print as 1? This is driving me mad. Somehow after the for loop the values of the object.num = 1 no matter what, even though they are never set to 1. Please copy the entire segment to debug.  <script...

Following my last thread (here), I think I've pin-pointed the problem.  However, I'm getting a headache trying to understand why this is occurring.  Context: I have an Object called "Schedule" within which I'm creating 52 "wee...

I was playing around with some design-patterns (Module Reveal and Singleton patterns) with basic stuff that worked as expected, like two utility functions that are shared with multiple objects, having one of them update the value of a String and the...