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iOS

Posted by Frank Demonte
Frank Demonte
736 Points

Noob question

I'm being asked in one of the challenges to assign an NSNumber literal 'thing' to '4'. The challenge before had me declare an id variable named 'thing' and set it to 'nil'. This line worked but the NSNumber one does not. Please help.

This is my code...

id thing = nil; NSNumber *thing = @4;

2 Answers

Matthew Mascioni
Matthew Mascioni
20,444 Points
Matthew Mascioni
Matthew Mascioni
20,444 Points

Hi Frank,

The id type in Objective-C is a special, dynamic data type. It can take on pretty much any value, including an NSNumber literal. Thus, we can simply assign the NSNumber literal, to thing, as such:

thing = @4;

Or, for example, if you wanted to assign it an NSString literal instead:

thing = @"Woo!";

Hope this helps!

Frank Demonte
Frank Demonte
736 Points
Frank Demonte
Frank Demonte
736 Points

Thanks Matt.