Simulating inheritance with Javascript

inheritance.js

// I'm not sure which of these is the best, they all have pros and cons.
// for more ideas, see http://ejohn.org/blog/simple-javascript-inheritance/

// ----- 1 [using functions as objects with prototypes]-----

function MyBaseClass() { };
MyBaseClass.prototype.myMethod = function() { };

function MyClass() {
  MyBaseClass.call(this); // call base class constructor
}

// note: prototype is an instance, shared between descendant objects
MyClass.prototype = new MyBaseClass();  


// ----- 2 [everything's an object instance] -----

var MyBaseClass = {
	myMethod: function() {}
}

// everything’s an object...
var MyClass = $.extend(MyBaseClass, {
	myOtherMethod: function() { }
});


// ----- 3 [Yahoo API pattern] -----

var MyBaseClass = function() {
	// do constructor stuff
	var privateToMyBaseClass = 1;
	return {
		someFunction: function() {}
	}
}();

var MyClass = function() {
	var privateToMyClass = 1;
	return $.extend(MyBaseClass, {
		myOtherMethod: function() {}
	})
};

x = new MyClass();