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 Object-Oriented Objective-C Memory, Arrays and Loops, Oh My! Alloc and Init

I cant solve this question!!

Create an NSMutableDictionary called 'carDict'. Allocate memory and initialize 'carDict' with the following key/value pairs: "Make":"Honda", "Model":"Accord". Do this all in one line of code.

my answer:

NSMutableDictionary *carDict = [[NSMutableDictionary alloc] carDict initWithObjectsAndKeys: @"Make", @"Honda", @"Model", @"Accord", nill];

doesnt anyone could tell me where I made a mistakes???

 NSMutableDictionary *carDict = [[NSMutableDictionary alloc] carDict :initWithObjectsAndKeys: @"Make", @"Honda", @"Model", @"Accord", nill];
Kamran Ismayilov
Kamran Ismayilov
5,753 Points

remove "carDict" after allocation, it comes before :initWithObjectsAndKeys method, yes and also get rid of " : " before init.

NSMutableDictionary *carDict = [[NSMutableDictionary alloc] initWithObjectsAndKeys: @"Make", @"Honda", @"Model", @"Accord", nill];

1 Answer

Sydney Srirak
Sydney Srirak
7,612 Points

NSMutableDictionary *carDict = [[NSMutableDictionary alloc] initWithObjects:[NSArray arrayWithObjects:@"Honda", @"Accord", nil] forKeys:[NSArray arrayWithObjects:@"Make", @"Model", nil]];