Extend objects using functional invocation pattern. How?

Question

Fiddle here: http://jsfiddle.net/rhodee/4NKVH/

I've been reading the Crockford book and was wondering what is a proven approach to prying open the base constructor object and adding a function to it that child objects can access?

I thought I could access the prototype of my object and it appears that is not possible given my current code.

Thanks for any ideas.

user123444555621 · Accepted Answer · 2012-07-12 03:48:55Z

1

You have several errors:

Your constructor function returns a totally unrelated object. Don't do that. Return this. (If no return statement exists, the constructor does this implicitly)
Superconstructor calls are not very intuitive in JS. You need the ugly construct MySuperclass.call(this, arg1, arg2, ...);, so in your case mammal.call(this, spec); in the cat class
You need the new keyword to instantiate an object that uses the prototype chain.

See http://jsfiddle.net/4NKVH/5/ for a fixed version of your code.

answered Jul 12, 2012 at 3:48

user123444555621

154k27 gold badges118 silver badges126 bronze badges

Sign up to request clarification or add additional context in comments.

Collectives™ on Stack Overflow

Extend objects using functional invocation pattern. How?

1 Answer 1

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

Comments

Your Answer

Sign up or log in

Post as a guest

Related