From ... Path: archiver1.google.com!news1.google.com!newsfeed.stanford.edu!news.tele.dk!small.news.tele.dk!129.240.148.23!uio.no!nntp.uio.no!ifi.uio.no!not-for-mail From: Erik Naggum Newsgroups: comp.lang.lisp Subject: Re: Totaly newbie trying to learn LISP at uni Date: 12 Oct 2002 03:34:56 +0000 Organization: Naggum Software, Oslo, Norway Lines: 12 Message-ID: <3243382496486911@naggum.no> References: <3DA59996.9020908@nyc.rr.com> Mime-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: 8bit X-Trace: maud.ifi.uio.no 1034393696 25499 129.240.65.5 (12 Oct 2002 03:34:56 GMT) X-Complaints-To: abuse@ifi.uio.no NNTP-Posting-Date: 12 Oct 2002 03:34:56 GMT Mail-Copies-To: never User-Agent: Gnus/5.09 (Gnus v5.9.0) Emacs/21.2 Xref: archiver1.google.com comp.lang.lisp:43772 * tar@sevak.isi.edu (Thomas A. Russ) | (null x) is equivalent to (and (symbolp x) (listp x)) | (null x) is equivalent to (and (listp x) (not (consp x))) It makes more sense to regard (null x) as equivalent to (typep x 'null). Note that `null´ is a system class the only object of which type is `nil´. -- Erik Naggum, Oslo, Norway Act from reason, and failure makes you rethink and study harder. Act from faith, and failure makes you blame someone and push harder.