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Asked: 2026-05-16T14:59:50+00:00

I can’t see why this isn’t working. I have two entities, let’s call them

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I can’t see why this isn’t working. I have two entities, let’s call them Employees and Departments. And Departments has a String attribute called division. This works perfectly:

NSLog(@"Division: %@",employee.department.division);

The console shows, let’s say, “Worldwide Seafood”. But if I attempt a comparison with the exact same string, it fails:

if(employee.department.division == @"Worldwide Seafood") NSLog(@"Works in seafood!");

Nothing displays in the console, i.e. the comparison is not working as it should.

Make sense to anyone? Thanks.

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1 Answer

  1. Editorial Team

    Using == to compare NSObject instances (in this case NSString instances) is a pointer comparison since Objective-C instances cannot be created on the stack. Thus, your code asks whether the NSString instance employee.department.division is the same pointer (same memory location) as a static string. This is almost certainly not the case.

    You should use

    [employee.department.division isEqualToString:@"Worldwide Seafood"]

    More generally, you should use -[NSObject isEqual:] to compare object instances.

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