The YUI Global Object: Create Class Hierarchies with extend
JavaScript supports the notion of class hierarchies. As in other object-oriented languages, you can create generic classes, then create specialized subclasses that add or override functionality of the superclass.
Click the "Show Inheritance" button to do some evaluation of the created object.
var chicken = new Chicken();
Using extend
Instantiate YUI
Creating a class hierarchy
In this example, we create a class Bird then create a subclass Chicken.
instanceof many classes
Unlike classes composed with augmentation, subclasses created with extend are also
considered instances of their superclass and all classes higher up the
inheritance tree.
We'll create an instance of Chicken and run some instanceof and method tests against it.
Other architecture strategies
Take a look at augment and mix for different strategies of managing your code structure.