Why does fast enumeration not skip the NSNumbers when I specify NSStrings?

Question

I thought that I knew how to use fast enumeration, but there is something I don\'t understand about it. If I create three NSString objects and three NSNum

Answer 1

Every object that descends from NSObject implements the method - (NSString)description, %@ in Objective-C formate string will take the corresponding argument for the %@ and call its description method, Most subclasses of NSObject will implement there own version of - (NSString)description. The same thing happens when you type

> po anObject

in the debugger.