class Car {
  start(typeEngine) {
    const engine = this.createEngine(typeEngine);

    engine.start();
  }

  createEngine(typeEngine) {
    throw new Error('You have to implement the method createEngine!');
  }
}

class MyCar extends Car {
  createEngine(typeEngine) {
    let engine;

    if (typeEngine === 'Jet') {
      engine = new Jet();
    } else if (typeEngine === 'Gas') {
      engine = new Gas();
    } else {
      engine = new Brayton();
    }

    return engine;
  }
}

class CarFactory {
  createCar() {
    throw new Error('You have to implement the method createCar!');
  }
}

class JetCarFactory extends CarFactory {
  createCar() {
    return new MyCar('Jet');
  }
}

class GasCarFactory extends CarFactory {
  createCar() {
    return new MyCar('Gas');
  }
}