Subject: Re: Totaly newbie trying to learn LISP at uni
From: Erik Naggum <>
Date: 12 Oct 2002 03:34:56 +0000
Newsgroups: comp.lang.lisp
Message-ID: <>

* (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.