In Objective-C, given an id, how can I tell what type of object it points to?

Question

Objective-C newbie question. Given the following (fictional) code:

id mysteryObject = [anotherObject mysteriousMethod];

How can I determine

Answer 1

[mysteryObject class]

will get you the class object. However, generally you want to do something OOPy like check for conformance to some protocol or interface.