From: "Pascal J. Bourguignon" <pjb@informatimago.com>
To: help-gnu-emacs@gnu.org
Subject: Re: Why doesn't nconc change my variable?
Date: Sun, 05 Oct 2014 20:14:22 +0200 [thread overview]
Message-ID: <87bnpqmlj5.fsf@kuiper.lan.informatimago.com> (raw)
In-Reply-To: mailman.10475.1412502895.1147.help-gnu-emacs@gnu.org
Marcin Borkowski <mbork@wmi.amu.edu.pl> writes:
> Does it mean that Pascal's earlier response was right? Now that I'm
> thinking about it, this makes sense: an empty list is (I would guess) a
> NUL pointer,
NO! There is no pointer in lisp!
An empty list is the symbol nil!
(symbolp (list)) --> t
(consp (list)) --> nil
(symbol-name (list)) --> "nil"
(symbolp (list 1)) --> nil
(consp (list 1)) --> t
(car (list 1)) --> 1
(cdr (list 1)) --> nil
--
__Pascal Bourguignon__ http://www.informatimago.com/
“The factory of the future will have only two employees, a man and a
dog. The man will be there to feed the dog. The dog will be there to
keep the man from touching the equipment.” -- Carl Bass CEO Autodesk
next prev parent reply other threads:[~2014-10-05 18:14 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-10-05 1:36 Why doesn't nconc change my variable? Marcin Borkowski
2014-10-05 1:58 ` Drew Adams
2014-10-05 9:54 ` Marcin Borkowski
2014-10-05 10:52 ` Thorsten Jolitz
2014-10-05 16:29 ` Drew Adams
2014-10-05 16:38 ` Drew Adams
[not found] ` <mailman.10475.1412502895.1147.help-gnu-emacs@gnu.org>
2014-10-05 18:12 ` Pascal J. Bourguignon
2014-10-05 18:14 ` Pascal J. Bourguignon [this message]
2014-10-05 18:31 ` Pascal J. Bourguignon
[not found] <mailman.10460.1412473030.1147.help-gnu-emacs@gnu.org>
2014-10-05 1:59 ` Pascal J. Bourguignon
2014-10-05 9:35 ` Marcin Borkowski
[not found] ` <mailman.10474.1412501757.1147.help-gnu-emacs@gnu.org>
2014-10-05 17:50 ` Pascal J. Bourguignon
2014-10-05 18:04 ` Pascal J. Bourguignon
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