inheritance of private members in javascript "the return"

gistfile1.js

Object.prototype.extends = function(p_class){
	var instance = new p_class
	instance.constructor = this.constructor;
	instance.getTypeName = function(){return instance.constructor.name;}
	instance.parent = new p_class;
	return instance;
}

//Object.prototype.getSelf = function(){return self;}

Object.prototype.new = function(){
	var instance = new this;
	instance.getTypeName = function(){return instance.constructor.name;}
	instance['ctor'].apply(instance,arguments);
	return instance;
}

function animal(p){

	var self = this;
	var note;
	var name;
	
	self.getNote=function(){return note}
	self.setNote=function(value){note = value}
	
	self.getName=function(){return name;}
	self.setName=function(value){name=value;}
	
	/* --- private --- */
	test=function(){return 'this is a test';}
	
	/* --- call private --- */
	self.callTest=function(){return test();}

	self.ctor = function(p){
		name = p;
		note = "a note from animal";
	}
	
	return self;
}


function dog(){
	var that = this.extends(animal);
	
	/*--- Private Members ---*/
	var specy = "???";
	
	/*--- Public Getters & Setters ---*/
	that.getSpecy=function(){return specy}
	that.setSpecy=function(value){specy = value}
	
	/*--- Public Method ---*/
	that.hello = function(){return 'Hello from '+that.getName();}
	
	/*--- Constructor ---*/
	that.ctor = function(p){
		that.setName(p)
	}
	
	return that;
}

function puppy(){
	var self = this.extends(dog);
	
	/* parent ctor is called */
	/*self.ctor = function(p){
		console.log("*** ctor of dog called ****");
		self.setName(p)
	}*/
	return self;
}

var a = animal.new("BOUBA");
var b = dog.new("Rex");
var c = dog.new("Wolf"); 

b.setNote("a note from Rex"); 
b.setSpecy("Berger Belge");
 

c.setNote("a note from Wolf"); c.setSpecy("Chien Loup");
var d = puppy.new("Junior"); d.setNote("a note from Junior"); d.setSpecy("Caniche");
var e = puppy.new("Germaine"); e.setNote("a note from Germaine"); e.setSpecy("York");


console.log(a.getName()+' '+a.getNote()+' '+a.getTypeName());

console.log(d.getName()+' '+d.getNote()+' '+d.getSpecy());
console.log(e.getName()+' '+e.getNote()+' '+e.getSpecy());

console.log(b.getName()+' '+b.getNote()+' '+b.getSpecy());
console.log(c.getName()+' '+c.getNote()+' '+c.getSpecy());

console.log(b.hello()+' '+b.getTypeName());
console.log(c.hello()+' '+c.getTypeName());
console.log(b.hello()+' '+b.getTypeName());
console.log(d.hello()+' '+d.getTypeName()+' '+d.parent.getTypeName());
console.log(e.hello()+' '+e.getTypeName());

console.log(e.callTest());