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 Build a Blog Reader iPhone App Exploring the Master-Detail Template Modifying the Master-Detail Template

Posted by Rodrigo Chousal
Rodrigo Chousal
16,009 Points

Now make the 'bookTitle' upper case

NSArray *booksArray = @[@"King Lear", @"Hamlet", @"Othello", @"Macbeth"]; NSString *bookTitle = booksArray[2];

2 Answers

Adam Rais
Adam Rais
Courses Plus Student 3,685 Points 
NSString *bookTitle = [booksArray[2] uppercaseString];
Gareth Borcherds
Gareth Borcherds
9,372 Points
Gareth Borcherds
Gareth Borcherds
9,372 Points

Adam is correct. To explain it a little further, if you look at what you are doing, you are creating a NSString called bookTitle and assigning it a string from the array booksArray. Now because you are creating an NSString, you have access to the class methods of NSString, which if we look at the documentation:

https://developer.apple.com/library/ios/documentation/Cocoa/Reference/Foundation/Classes/NSString_Class/Reference/NSString.html#//apple_ref/occ/instm/NSString/uppercaseString

we see that there is a method to change the string to upper case. We call that method on our string returned from our array and make it all uppercase.