Subject: Re: Must MAPCAR substitute NIL for nothing? From: Erik Naggum <firstname.lastname@example.org> Date: Wed, 21 Nov 2001 19:41:31 GMT Newsgroups: comp.lang.lisp Message-ID: <email@example.com> * Dr. Edmund Weitz | have I missed something more basic than the definition of MAPCAR in | the standard that forces CL to always return (1 NIL 3) in this case? Yes. The primary value of (values) is nil. | I think it could be convenient to be able to suppress values in such a | way but maybe you can convince me that I haven't thought deeply enough | about it. Use mapcan and return lists of varying lengths. /// -- Norway is now run by a priest from the fundamentalist Christian People's Party, the fifth largest party representing one eighth of the electorate. -- Carrying a Swiss Army pocket knife in Oslo, Norway, is a criminal offense.