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iOS Objective-C Basics (Retired) Foundation Framework NSDictionary

Michael Nees
Michael Nees
1,070 Points

NSMutableDictionary

Let's add the year of the album to the 'albumMutable' variable. Where the key is a NSString 'year' and the value is also a NSString '1969'.

NSString *year = [year objectForKey:@"year"]; [albumMutable setObject:@1969 for key:@"year"];

What is wrong here???

3 Answers

Stone Preston
Stone Preston
42,016 Points

...value is also a NSString '1969'.

your value needs to be a string literal, it is currently an NSNumber literal. you need to use this

[albumMutable setObject:@"1969" forKey:@"year"];

this line here:

NSString *year = [year objectForKey:@"year"];

is also unnecessary and incorrect. the setObject ForKey method takes care of adding the key and the value in one call.

Michael Nees
Michael Nees
1,070 Points

Thanks very much guys!