Are you talking about whether the slot is "nil" or not? You can just do:
(some-slot nil) to match for an empty slot or (some-slot ~nil) to match a non-empty slot On Oct 30, 2008, at 7:58 AM, David Coyle wrote:
Hello: I'm working with objects that have numerous relationships to others. There are a number of times where I need to simply check whether a particular relationship is or is not null, without caring about the actual destination object itself. I haven't found an appropriate function: does one exist, or is there a standard approach to determining null? thanks, -dave- David Coyle PhD Lead Web Application Architect m: 919.454.7770 www.livescribe.com ---------------------------------- LiveScribe, Inc. 7677 Oakport St. 12th Floor Oakland, CA 94621 -------------------------------------------------------------------- To unsubscribe, send the words 'unsubscribe jess-users [EMAIL PROTECTED]' in the BODY of a message to [EMAIL PROTECTED], NOT to the list (use your own address!) List problems? Notify [EMAIL PROTECTED] . --------------------------------------------------------------------
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