JavaScript Inheritance

gistfile1.txt

//**************************************************************
var Vehicle = (function(){ 
    function Vehicle(model, year, engineSize) { 
        this.model = model;
        this.year = year;
        this.engineSize = engineSize;
        var engineIsStarted = false;
        this.isStarted = function () { return engineIsStarted; }
        this.start = function () { engineIsStarted = true; }
        this.stop = function () { engineIsStarted = false; }
    }
    
    return Vehicle;
}());
var Car = (function (parent) {
    Car.prototype = new Vehicle();
    Car.prototype.constructor = Car;
    function Car(model, year, engineSize, wheelCount) {
        parent.call(this, model, year, engineSize);
        this.wheelCount = wheelCount; 
    } 
    
    return Car; 
}(Vehicle));
var Boat = (function (parent) { 
    Boat.prototype = new Vehicle(); 
    Boat.prototype.constructor = Boat; 
    function Boat(model, year, engineSize, width, length) { 
        parent.call(this, model, year, engineSize); 
        this.width = width; 
        this.length = length; 
    } 
    
    return Boat;
}(Vehicle));

//*****************************************************************
var a = {
  first : 'Hello',
  second : 'World',
  sum : function(x, y){
    return x + y;
  }
};
var b = {
  difference : function(x, y){
    return x - y;
  },
  __proto__ : a
};
 
var c = {
  product : function(x, y){
    return x * y;
  },
  __proto__ : a
};
//*****************************************************************
(function (Module) {
	var _age;

	function Animal(name, description, age) {
		this.name = name;
		this.description = description;
		_age = age;
	}
	
	Animal.prototype.addYear = function() {
		_age++;
	}
			
	Animal.prototype.getAge = function() {
		return _age;
	}
			
	Module.Animal = Animal;

})(window.Module || (window.Module = {}));		
			
(function (Module) {
				
	function Tigre(name, description, age, nrayas) {
		Module.Animal.call(this, name, description, age);
		this.nrayas = nrayas;
	}
						
	Tigre.prototype = new Module.Animal;
	Module.Tigre = Tigre;

})(window.Module || (window.Module = {}));