Extending Javascript objects with a help of AngularJS extend method

Multiple ways of extending javascript objects

 * One-way reference from subclass to superclass (instance)
 * Most of the time this is what you want. It should be done
 * before adding other methods to Subclass.
ChildClass.prototype = new SuperClass();
 * Two-way reference
 * Superclass will also get any Subclass methods added later.
ChildClass.prototype = SuperClass.prototype;
 * Cloning behavior
 * This does not setup a reference, so instanceof will not work.
angular.extend(ChildClass.prototype, SuperClass.prototype);
 * Enhancing a single instance
 * This could be used to implement the decorator pattern.
angular.extend(subClassInstance, SuperClass.prototype);

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