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 The answers might become outdated with the introduction of new features in the release of ECMAScript 6.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...
This question already has answers here:...
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...
I'm seeing posts about a 'new' Object.create that makes enumeration configurable.  However, it relies on a Object.defineProperty method.  I can't find a cross browser implementation for this method.    Are we stuck writing for the o...
I don't find anything about my question here on MDC or the ECMAscript specifications. Probably somebody knows a more 'hacky' way to solve this.  I'm calling "use strict" on every javascript file in my environment. All my files...
Consider the following code, using ECMAScript5's Object.defineProperty feature:  var sayHi = function(){ alert('hi'); }; var defineProperty = (typeof Object.defineProperty == 'function'); if (defineProperty) Object.defineProperty(...

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