That's because that type of code is actually better performing than the dynamic dispatch. There's absolutely nothing wrong with this code. It's just that it's

That's because that type of code is actually better performing than the dynamic dispatch. There's absolutely nothing wrong with this code. It's just that it's not as extensible It's a 'closed world' representation where the code assumes it knows about every possibility. This make extension more difficult The code itself is extraordinarily good and performant.