Abstract factory in JavaScript

abstract-factory-es5.js

function porscheCar(params) {
  this.engine = params.engine;
  this.tyreModel = params.tyreModel;
  this.gears = params.gears;
}

function porscheCarFactory() {
  this.createCar = function(params) {
    return new porscheCar(params);
  }
}

function ferrariCar(params) {
  this.engine = params.engine;
  this.tyreModel = params.tyreModel;
  this.gears = params.gears;
  this.turbo = params.turbo;
}

function ferrariCarFactory() {
  this.createCar = function(params) {
    return new ferrariCar(params);
  }
}

function carFactoryImpl() {
  this.porcheCarFactory = new porscheCarFactory();
  this.ferrariCar = new ferrariCarFactory();
  
  this.getPorsche = function() {
    return this.porcheCarFactory;
  }
  
  this.getFerrari = function() {
    return this.ferrariCar;
  }
}

var fact = new carFactoryImpl();
var params = { engine: "", tyreModel: "", gears: null };
var concretePorsche = fact.getPorsche().createCar(params);
console.log(concretePorsche.engine);

params = { engine: "", tyreModel: "", gears: null, turbo: true };
var concreteFerrari = fact.getFerrari().createCar(params);
console.log(concreteFerrari.turbo);