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Aleks Dahlberg
19,103 PointsWhat have I missed?
Task: Create an array named 'booksArray' with the following book titles: 'Hamlet', 'King Lear', 'Othello', 'Macbeth'.
my code:
self.booksArray = [NSArray arrayWithObjects:@"Hamlet", @"King Lear", @"Othello", @"Macbeth", nil];
7 Answers
Bradley White
21,285 PointsThe code challenge engine isn't importing a .h file so your self.booksArray doesn't have anything to reference back to. In Xcode, if you have a property declared in the .h file as:
@property (nonatomic, strong) NSArray *booksArray;
then the code you have typed in would work. :)
Here is a shorthand version of that will work with the code challenge.
NSArray *booksArray = @[@"Hamlet", @"King Lear", @"Othello", @"Macbeth"];
Here is the long version:
NSArray *booksArray = [NSArray arrayWithObjects:@"Hamlet", @"King Lear", @"Othello", @"Macbeth", nil];
The alloc and init methods are replaced with @[ ] with the objects inside the brackets and nil is no longer needed. It works the same.
It will work for NSArray in Xcode but not for a NSMutableArray.
If you are in Xcode and the .h file is imported then you could set it up like this:
self.booksArray = @[@"Hamlet", @"King Lear", @"Othello", @"Macbeth"];
Aleks Dahlberg
19,103 PointsThanks that worked!
Aleks Dahlberg
19,103 PointsQ= Create a string variable called 'bookTitle' and assign it the third item from the 'booksArray'.
My code:
NSArray *booksArray = [[NSArray arrayWithObjects] alloc:@"Hamlet", @"King Lear", @"Othello", @"Macbeth", nil]; NSString *bookTitle = [NSArray objectAtIndex:@"Othello"];
Having trouble with this too. Sorry for the boring questions :P
Bradley White
21,285 Pointsthe objectAtIndex method requires a number, not a string. (Hint: it's not a 3. Remember how computers count, not humans.)
Aleks Dahlberg
19,103 PointsI had tried "2" before but had no greenlight
Aleks Dahlberg
19,103 PointsNSString *bookTitle = [booksArray objectsAtIndex:2];
NSString *bookTitle = [booksArray objectsAtIndex:@"2"];
Neither worked
Bradley White
21,285 PointsYou typed objectsAtIndex.
Use objectAtIndex