CODEWITHSUNDEEP
javascript
kotio
kotio

Reputation: 13

Constructor inherit from Constructor

OK, let's say I have a constructor like this one:

var Base = function() {};
Base.prototype.shmoo = function() { this.foo="shmoo"; }

How to create other constructors extending Base independently from it and separately from each other as well?

In other words extending functionality of a derived constructor affects only its objects and no other, neither Base , neither another derived one.

I've tried 

Extender = function() {};
Extender.prototype = Base.prototype;
Extender.prototype.moo = function() { this.moo="boo"; };

but that takes effect everywhere, of course.

Should I simulate class hierarchy? I try to stay away from that pattern.

Upvotes: 1

Views: 74

Answers (1)

gnerkus
gnerkus

Reputation: 12019

This would implement prototypical inheritance (which is what you want):

 // The Extender prototype is an instance of Base but not Base's prototype     
Extender.prototype = new Base();

// Set Extender() as the actual constructor of an Extender instance
Extender.prototype.constructor = Extender;

Upvotes: 1

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