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Lincoln Sills
1,214 PointsCode Challenge: Creating a Custom Class
Need some help with Code Challenge, thank you
Challenge: ~Switch to the implementation file and implement a 'quotes' method which will allocate and initialize the _quotes instance variable only if it is 'nil'. Initialize the array with any three strings.
Code:
import "Quote.h"
@implementation Quote
-
(NSString *) randomQuote {
return @"Some Quote"; }
-
(NSArray *) quotes { if (_quotes == nil){ _quotes = [[NSArray alloc] initWithObjects:@"It is certain", @"You bet ya", @"Without any doubt", nil];}
return _quotes;}
@end
The error message isn't helping and the code "AS IT ALWAYS DOES" compiles in Xcode just fine.
Again, thank you for any help here.
6 Answers
Stone Preston
42,016 Pointsi tried your code and it passed the task fine. below is my .m:
#import "Quote.h"
@implementation Quote
- (NSArray *) quotes {
if (_quotes == nil){
_quotes = [[NSArray alloc] initWithObjects:@"It is certain", @"You bet ya", @"Without any doubt",
nil];
}
return _quotes;
}
- (NSString *) randomQuote {
return @"Some Quote";
}
@end
and here is the .h:
@interface Quote : NSObject
// Add property here
@property (nonatomic, strong) NSArray *quotes;
- (NSString *) randomQuote;
@end
Patrick Donahue
9,523 PointsShould be self.quotes = [NSArray alloc] init......
Stone Preston
42,016 Pointsactually his code uses the correct method, initWithObjects since the task asks to allocate and initialize the array with three strings.
Stone Preston
42,016 Pointsand also shouldnt be self.quotes since we want to access the _quotes ivar directly in this getter method for the quotes property.
Lincoln Sills
1,214 PointsOK, thank you guys for all the help. Adding ".self" didn't work and I have to say (I am learning here so this is just my thought process) adding self to an alloc and init method doesn't makes sense. Again I am trying to understand the code. Thank you again and I will post any updates.
Lincoln Sills
1,214 PointsI fixed the problem, in my header file I had readonly in my property declaration. While it didn't cause a problem in the first example the second example didn't like it.
Can anyone elaborate just a little and tell me why that is? Thank you both for your help.
Sammy Malin
3,244 PointsIf you are going to have readonly in your property declaration, you must create your own instance variable in the interface file. For example: '''Objective-C @interface Quote : NSObject { NSArray *_predictions; }'''
Sammy Malin
3,244 PointsIf you are going to have readonly in your property declaration, you must create your own instance variable in the interface file. For example:
@interface Quote : NSObject { NSArray *_quotes; }
Sammy Malin
3,244 PointsIf you are going to have readonly in your property declaration, you must create your own instance variable in the interface file. For example: @interface Quote : NSObject { NSArray *_quotes; }