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!
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
Alex Hamilton4,103 Points
Mutable dictionary - setDictionary?
Code 2/3 NSDictionary - Objective C Basics -Asks to create an NSMutableDictionary named albumMutable and then to use dictionaryWithDictionary class method (NSDictionary)... could we use setDictionary instance method on the mutable class instead? I don't see a class method on NSMutableDictionary called dictionaryWithDictionary............ can we use all the class methods from NSDictionary in NSMutableDictionary due to inheritance?
Yes, NSMutableDictionary is a subclass of NSDictionary, so you can use all NSDictionary methods with NSMutableDictionary. In fact, there is a whole set of nice properties and corollaries you get from inheritance that make the object-oriented programming paradigm so popular.