Objective-C Test

Objective C tutorial linkedin

What is the value of s?

NSMutableString *s = [NSMutableString stringWithString:@"123"];

 [s appendString:@"456"];

• 123
• 123456
• 456
• This code contains an error.

linkedin Objective C skill assessment

What's the value of i after these statements?

NSString *str = nil;

NSInteger i = str.integerValue;

• This code crashes.
• nil
• -1
• 0

linkedin Objective C test answers

What value is in str after this line is executed?

NSString str = "test" + " " + "more";

• test
• nil
• This code contains an error.
• test more

Objective C linkedin Quiz

What does this code print?

NSPredicate *p2 = [NSPredicate predicateWithBlock:^BOOL(NSString* evaluatedObject,

 NSDictionary * _Nullable bindings) {

 return evaluatedObject.intValue % 2 == 0;

}];

NSArray *vals = @[@"1",@"2",@"3"];

NSArray *n2 = [vals filteredArrayUsingPredicate:p2];

NSLog(@"%@", n2.firstObject);

• Nothing, since this code contains an error.
• 1,2
• 2
• 1,2,3

linkedin Objective C skill assessment answers

Property defaults include _____.?

• nonatomic/weak
• atomic/weak
• nonatomic/strong
• atomic/strong