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Asymmetrical behavior in NSMutableArray

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Asymmetrical behavior in NSMutableArray

Subject: Asymmetrical behavior in NSMutableArray
From: Serge Meynard <email@hidden>
Date: Thu, 10 Mar 2005 00:06:34 -0500

Greetings,

I just discovered something interesting behavior-wise in NSMutableArray... Since the class does not handle duplicates, you can add the same object several times to an array and it will appear in several slots. But if you then call removeObject: on that same object, ALL INSTANCES of the object are removed from the array! I wrote a short test app to confirm that I wasn't dreaming this up.

Is this normal, expected behavior? Shouldn't the class stick to never handling duplicates no matter the method call?

(And yes, I know about NSSet and NSCountedSet... That's not the issue here :)

Serge

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