On Friday, June 06, 2008, at 02:07PM, "George Stuart" <[EMAIL PROTECTED]> wrote:

>The suggestion of using a keyPath of @"self" presents another question:
>1)  I assume NSSortDescriptor is using valueForKeyPath:, which in  
>turns calls valueForKey: some number of times, to get the object for  
>the keyPath I specified.  Is it defined behavior that sending an  
>object valueForKey:@"self" will return the object itself?  

I always use self as the key path in cases like this, since -[NSObject self] is 
documented to return the receiver.  It has the advantage of working with 
objects other than strings.

> I guess  
>this is ultimately the same as my original question, "is it defined  
>behavior that sending an object valueForKey:nil will return the object  
>itself?"

Not as far as I know; I'd expect it to return nil or die with an assertion 
failure.

-- 
Adam
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