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

Zenek Barburka
Zenek Barburka
7,009 Points

code fine in Xcode but not in challange

I am not sure what's wrong with it, Xcode compiles it just fine

variable_assignment.mm
  NSMutableDictionary *carDict = [[NSMutableDictionary alloc] initWithObjectsAndKeys:@"Make",@"Honda",@"Model",@"Accord",nil];

2 Answers

Jennifer Nordell
seal-mask
STAFF
.a{fill-rule:evenodd;}techdegree
Jennifer Nordell
Treehouse Teacher

Hi there! You're correct, your code compiles just fine, but it's not giving the keys and value pairs they are expecting. Essentially, you have your keys and values backward. First we say the value and then the key. I know this may seem a little backwards especially if you are used to other programming languages. For example, you have the value "Make" at the key "Honda". But we want the value "Honda" at the key "Make".

Take a look:

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

Here we we have the value of "Honda" at the key "Make" and the value of "Accord" at the key "Model".

Hope this helps! :sparkles: