interface Car default CarFactory {
    Car(manufacturer);
    final manufacturer;
}

class CarFactory {
   factory Car(manufacturer) {
      if (manufacturer == "Ferrari") {
         return new Racingcar(manufacturer);
      }
      return new Saloon(manufacturer);
   }
}

class Racingcar implements Car {
   Racingcar(this.manufacturer);
   String manufacturer;
}

class Saloon implements Car {
   Saloon(this.manufacturer);
   String manufacturer;
}

main() {
    print(new Car("Ferrari") is Racingcar);
    print(new Car("VW") is Racingcar);
}