From: Barry Margolin <barmar@alum.mit.edu>
To: help-gnu-emacs@gnu.org
Subject: Re: alists with precomputed variables
Date: Wed, 21 Jan 2009 00:49:23 -0500 [thread overview]
Message-ID: <barmar-B5083B.00492321012009@mara100-84.onlink.net> (raw)
In-Reply-To: mailman.5420.1232514814.26697.help-gnu-emacs@gnu.org
In article <mailman.5420.1232514814.26697.help-gnu-emacs@gnu.org>,
"Drew Adams" <drew.adams@oracle.com> wrote:
> > (setq my-var 20)
> > (setq my-alist '((p1 . 10) (p2 . my-var)))
> >
> > I naively thought that would give me
> > ((p1 . 10) (p2 . 20))
> >
> > but it instead results in
> > ((p1 . 10) (p2 . my-var))
> >
> > How can I get what I expected?
>
> (setq my-alist `((p1 . 10) (p2 ,@my-var)))
I guess that might work, but ,@ is supposed to be followed by an
expression that returns a list, so that it can be spliced into the
containing list. It would be better to write:
(setq my-alist `((p1 . 10) (p2 . ,my-var)))
--
Barry Margolin, barmar@alum.mit.edu
Arlington, MA
*** PLEASE post questions in newsgroups, not directly to me ***
*** PLEASE don't copy me on replies, I'll read them in the group ***
next prev parent reply other threads:[~2009-01-21 5:49 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-01-21 5:03 alists with precomputed variables Erik Iverson
2009-01-21 5:13 ` Drew Adams
[not found] ` <mailman.5420.1232514814.26697.help-gnu-emacs@gnu.org>
2009-01-21 5:49 ` Barry Margolin [this message]
2009-01-21 7:54 ` Drew Adams
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=barmar-B5083B.00492321012009@mara100-84.onlink.net \
--to=barmar@alum.mit.edu \
--cc=help-gnu-emacs@gnu.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
Code repositories for project(s) associated with this external index
https://git.savannah.gnu.org/cgit/emacs.git
https://git.savannah.gnu.org/cgit/emacs/org-mode.git
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.