Super and Constructor!

gistfile1.js

var Animal = clazz(function Animal(){
  this.private = {
    name: 'animal'
  };
  this.public = {
    sayHello: function sayHello(){
      return 'Hi, my name is ' + this.private.name + '!';
    }
  };
  
  this.constructor = function constructor(name){
    this.private.name = name;
  };
});
 
var Dog = clazz(function Dog(){
  this.extend = 'Animal';
  this.public = {
    sayHello: function sayHello(){
      return this.super.sayHello() + ' How are you?';  
    }
  };
  
  this.constructor = function constructor(name){
    this.super.constructor(name);
  };
});
 
var dog = new Dog('Brian');
dog instanceof Animal; //True
dog.sayHello(); //Hello, my name is Brian! How are you?
dog.name; //undefined