NOTE: This question was asked from the viewpoint of ECMAScript version 3 or 5. The answers might become outdated with the introduction of new features in the release of ECMAScript 6.   What exactly is the function of the var keyword in JavaScrip...
I was looking at some snippets of code, and I found multiple elements calling a function over a node list with a forEach applied to an empty array.  For example I have something like:  [].forEach.call( document.querySelectorAll('a'), functi...
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I understand that every function in JavaScript is a first-class object and it has an internal property [[scope]] which hosts the binding records of the function's free variables. However, there are two special cases.   Is the function created b...
Why are objects not iterable by default?  I see questions all the time related to iterating objects, the common solution being to iterate over an object's properties and accessing the values within an object that way. This seems so common that...
So I saw a function that was, quite frankly beautiful in its simplicity as it allowed you to find the global object ( which depending on environ at the time may NOT have been window ) while within an anonymous function; however when you throw javascr...
I understand about how eval() works in non-strict contexts, however the case of using eval() in strict mode has completely befuddled me.  When eval() is called directly in the global scope, variables are kept inside the new eval() scope:  'use st...
ECMAScript allows us to define getters or setters as following:  [text/javascript]  var object = {   property: 7,   get getable() { return this.property + 1; },   set setable(x) { this.property = x / 2; } };   I can work around if I'm using a cla...

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