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No sure way to tell whether an array is mutable?

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No sure way to tell whether an array is mutable?

Subject: No sure way to tell whether an array is mutable?
From: Kenny Leung <email@hidden>
Date: Thu, 25 Jan 2007 18:21:16 -0800

Hi All.

I think I have just been burned by something sinister: an object says that it is an NSMutableArray, but turns out to be non-mutable. I'm wondering if anyone has run into this:

code snippet:

    if ( [newChildren isKindOfClass:[NSMutableArray class]] ) {
        HXDebug(@"Mutable:%@", newChildren);
    }
    [newChildren insertObject:entry atIndex:newIndex];

output:

DEBUG Mutable:() *** -[NSCFArray insertObject:atIndex:]: mutating method sent to immutable object

Thanks for any insight!

-Kenny

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