Welcome to the Treehouse Community

Want to collaborate on code errors? Have bugs you need feedback on? Looking for an extra set of eyes on your latest project? Get support with fellow developers, designers, and programmers of all backgrounds and skill levels here with the Treehouse Community! While you're at it, check out some resources Treehouse students have shared here.

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and join thousands of Treehouse students and alumni in the community today.

Start your free trial

iOS Objective-C Basics (Retired) Advanced Objective-C Dynamic Typing

Posted by Eric Griffin
Eric Griffin
2,553 Points

How do I declare a variable named thing of type id & initialize it to nil? Thank you!

Any helpful hints would be greatly appreciated. Thanks

object.mm 
Thing *thing = [[Thing alloc]init];

1 Answer

Chris Shaw
Chris Shaw
26,676 Points
Chris Shaw
Chris Shaw
26,676 Points

Hi Eric,

For this task all we need to do is use the type id which is a universal type that accepts any value, for the value we just need to assign the value nil.

id thing = nil;

Happy coding!

Eric Griffin
Eric Griffin
2,553 Points

Hi Chris, thanks very much for your help! Very much appreciated. All the best.