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IOS Technical Test MCQs

Which of the following code samples will declare a variable inside a block in Objective-C?

Person *aPerson = nil; [participants enumerateObjectsUsingBlock:^(id obj, NSUInteger idx, BOOL *stop) { Person *participant = (Person*)obj; if ([participant.gender isEqualToString:@"M"]) { aPerson = participant; *stop = YES; } }]; return aPerson;

__block Person *aPerson = nil; [participants enumerateObjectsUsingBlock:^(id obj, NSUInteger idx, BOOL *stop) { Person *participant = (Person*)obj; if ([participant.gender isEqualToString:@"M"]) { aPerson = participant; *stop = YES; } }]; return aPerson;

[participants enumerateObjectsUsingBlock:^(id obj, NSUInteger idx, BOOL *stop) { Person *participant = (Person*)obj; Person *aPerson = nil; if ([participant.gender isEqualToString:@"M"]) { aPerson = participant; *stop = YES; } }]; return aPerson;

All of the above.

Answer

Correct Answer: [participants enumerateObjectsUsingBlock:^(id obj, NSUInteger idx, BOOL *stop) { Person *participant = (Person*)obj; Person *aPerson = nil; if ([participant.gender isEqualToString:@"M"]) { aPerson = participant; *stop = YES; } }]; return aPerson;

Explanation:

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