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When to use key-value coding to get values vs. accessors

Subject: When to use key-value coding to get values vs. accessors
From: Paul Bruneau <email@hidden>
Date: Thu, 1 Nov 2007 16:29:02 -0400
Delivered-to: email@hidden
Delivered-to: email@hidden

Hi-

Not looking for an in-depth explanation (I should be able to find/ understand the docs once I get tipped in the right direction), but can someone briefly hint to me the reason Apple uses key-value coding in this example code:

- (NSString *)fullNameAndID
{
    return [NSString stringWithFormat:@"%@, %@ (%@)",
            [self valueForKey:@"lastName"],
            [self valueForKey:@"firstName"],
            [self valueForKey:@"employeeID"]];
}

the example comes from http://developer.apple.com/documentation/Cocoa/Conceptual/ NSPersistentDocumentTutorial/03_CustomClass/chapter_4_section_3.html

Is there any advantage over doing it how I would tend to think to do it?:

- (NSString *)fullNameAndID
{
    return [NSString stringWithFormat:@"%@, %@ (%@)",
            [self lastName],
            [self firstName],
            [self employeeID]];
}

It must be because using -valueForKey: triggers something somewhere but I don't quite have a handle on what. Is it better Cocoa practice to just always use valueForKey? Or do I have to keep track in my head on an object by object (or even accessor by accessor) basis when it should be used? _______________________________________________

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