The API Reference Scope page says: A scope can inherit from a parent scope. The Developer Guide Scope page says: A scope (prototypically) inherits properties from its parent scope. So, doe...
This figure again shows that every object has a prototype. Constructor function Foo also has its own __proto__ which is Function.prototype, and which in turn also references via its __proto__ p...
Every JS opinion leader says that extending the native objects is a bad practice. But why? Do we get a perfomance hit? Do they fear that somebody does it "the wrong way", and adds enumerable types to ...
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. ...
I have a situation where I need to check if a constructor (X) has another constructor (Y) in its prototype chain (or is Y itself). The quickest means to do this might be (new X()) instanceof Y. That ...
I'm looking for a simple way of creating two classes, one inheriting from the other, and the child redefining one of the parent's methods, and inside the new method, calling the parent's. For example...