prototypal-inheritance

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 isn't an option in this case because the constructors in question may throw if instantiated without valid arguments. The next approach I've considered is this: const doesInherit = (A, B) => { while (A) { if (A === B) return true; A = Object.getPrototypeOf(A); } return false; } That works, but I can't shake the sense that I'm missing some more straightforward way to check this. Is there one?

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, having a class Animal and Dog , where the Animal class defines a method makeSound() which establishes how to output a sound, which Dog then overrides in its own makeSound() method to make a "woof" sound, but while also calling Animal's makeSound() to output that woof. I looked at John Resig's model here , but it uses the native arguments.callee property which is apparently depreciated in ECMA

In all the articles it is written that JavaScript is a prototype-based language, meaning that every object has a prototype (or, more precisely, prototype chain). So far, I've tried the following code snippet: var F = function(); F.prototype.member1 = 1; var object1 = new F(); console.log(object1.member1); // prints 1 How can I access the prototype object of object1 ? Is there a browser-neutral way to do that (I mean, not relying on __proto__ property? Seen this link, but maybe there are new developments since 2010) If I can't, could you share please the rationale behind the hood? Andrew D. var

I have been programming with OOP languages for over 10 years but I'm learning JavaScript now and it's the first time I've encountered prototype-based inheritance. I tend to learn fastest by studying good code. What's a well-written example of a JavaScript application (or library) that properly uses prototypal inheritance? And can you describe (briefly) how/where prototypal inheritance is used, so I know where to start reading? Gregory Pakosz Douglas Crockford has a nice page on JavaScript Prototypal Inheritance : Five years ago I wrote Classical Inheritance in JavaScript. It showed that

Now while I know that you can not perform inheritance like you would in C#, I have seen it mentioned on the Internet that it is kind of possible. If it's not possible using plain JavaScript code then would it be possible using Ext JS and if so how? CMS The JavaScript object oriented paradigm is prototype based . There are no "classes", just objects. You can implement inheritance in different ways. The two more popular alternatives are the "pseudo-classical" and the "prototypal" forms. For example: Pseudo-classical inheritance I think this is the most popular way. You create constructor