Checking for the type is the exact opposite of OO. The correct OO would be to think about what the check represent, maybe abstract it in a base interface with

Checking for the type is the exact opposite of OO. The correct OO would be to think about what the check represent, maybe abstract it in a base interface with pure abstract methods and derive from that interface. What you describe is what people without understanding of OO do when they come from a language without OO.