Based on the idea that objects inherit from objects, Douglas Crockford suggests the use of an object()
function that accepts an object and returns a new one that has the parent as a prototype.
function object(o) { function F() {} F.prototype = o; return new F(); }
If you need access to an uber
property, you can modify the object()
function like so:
function object(o) { var n; function F() {} F.prototype = o; n = new F(); n.uber = o; return n; }
Using this function will be the same as the extendCopy()
: you basically take an object such as twoDee
, create a new object from it and then proceed to augmenting the new object.
var triangle = object(twoDee); triangle.name = 'Triangle'; triangle.getArea = function(){return this.side * this.height / 2;};
The new triangle still behaves the same way:
>>> triangle.toString()
"shape, 2D shape, Triangle"
This pattern is also referred to as prototypal inheritance, because you use a parent object as the prototype of a...