overloading.coffee

#this is the coffeescript with method overloading

class User
	find: (id) ->
		console.log "find by id"
	
	find: (first, last) ->
		console.log "find by first and last name"
		
class NewUser extends User
	find: (first, middle, last) ->
		console.log "find by full name"

overloading.js

//and this is the compiled JavaScript

//unfortunately, because of inheritance, __addMethod must be called for
//all methods being added to any class unless the compiler is smart enough
//to keep track of the methods of the super class and whether they are
//overloaded.

var NewUser, User;
var __extends = function(child, parent) {
    var ctor = function(){};
    ctor.prototype = parent.prototype;
    child.prototype = new ctor();
    child.prototype.constructor = child;
    if (typeof parent.extended === "function") parent.extended(child);
    child.__super__ = parent.prototype;
};

//originally by John Resig
var __addMethod = function(klass, name, fn) {
	var old = klass.prototype[name];
	klass.prototype[name] = !(name in klass.prototype) ? fn : function() {
		if(fn.length == arguments.length)
			return fn.apply(this, arguments);
		else if(typeof old == 'function') 
			return old.apply(this, arguments);
	};
};

User = function() {};

__addMethod(User, "find", function(id) {
	console.log("find by id");
});

__addMethod(User, "find", function(first, last) {
	console.log("find by first and last name");
});

NewUser = function() {
	return User.apply(this, arguments);
};
__extends(NewUser, User);

__addMethod(NewUser, "find", function(first, middle, last) {
 	console.log("find by full name");
});