gistfile1.js

// OO-ish

function Car(manufacturer, model) {
    this.manufacturer = manufacturer;
    this.model = model;
}

var porsche = new Car('Porsche', 'Carrera');
var ferrari = new Car('Ferrari', 'Enzo');


// Prototype

function Car(object, manufacturer, model) {
  object.manufacturer = manufacturer;
  object.model = model;
  return object;
}

var porsche = Car({}, 'Porsche', 'Carrera');

// Extrapolando...
function Duck(object) {
  object.quack = function() { 
    return 'Quack!'; 
  }
}

porsche = Duck(porsche);

// Extrapolando um pouco mais, espero que ninguém use...

var Duck = {
  quack: function(){
    return "Quack Quack"
  }
};

porsche.__proto__ = Duck;
porsche.quack();
porsche. manufacturer;