From: Drew Adams <drew.adams@oracle.com>
To: Michael Heerdegen <michael_heerdegen@web.de>,
"help-gnu-emacs@gnu.org" <help-gnu-emacs@gnu.org>
Subject: RE: [External] : Re: Testing whether a list contains at least one non-nil element
Date: Tue, 25 Oct 2022 15:59:59 +0000 [thread overview]
Message-ID: <CO6PR10MB5473F9CA2255BBF750B1531CF3319@CO6PR10MB5473.namprd10.prod.outlook.com> (raw)
In-Reply-To: <87pmegm7lk.fsf@web.de>
> > I would like to test whether a list contains
> > at least one non-nil element?
>
> I'd use `cl-some': (cl-some #'identity my-list).
> There are lots of other possible solutions, like
> using a simple `while' loop or a `dolist' with
> `catch' and `throw'.
IOW:
(setq toto '(nil nil 3 nil nil))
(defun foo (xs)
(while (and (not (car xs)) xs)
(setq xs (cdr xs)))
(car xs))
(defun bar (xs)
(catch 'bar
(dolist (x xs) (when x (throw 'bar t)))
nil))
(foo toto)
(bar toto)
Or just:
(cl-member-if-not #'null toto)
next prev parent reply other threads:[~2022-10-25 15:59 UTC|newest]
Thread overview: 39+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-10-25 10:16 Testing whether a list contains at least one non-nil element Heime
2022-10-25 10:46 ` Jean Louis
2022-10-25 10:47 ` Jean Louis
2022-10-25 10:50 ` Jean Louis
2022-10-25 12:12 ` Emanuel Berg
2022-10-26 18:56 ` Jean Louis
2022-10-27 3:54 ` [External] : " Drew Adams
2022-10-27 4:53 ` Jean Louis
2022-10-27 5:30 ` Emanuel Berg
2022-10-27 15:54 ` Drew Adams
2022-10-27 17:47 ` Elisp and CL (was: Re: [External] : Re: Testing whether a list contains at least one non-nil element) Emanuel Berg
2022-10-27 20:38 ` [External] : Re: Testing whether a list contains at least one non-nil element Jean Louis
2022-10-28 0:22 ` Emanuel Berg
2022-10-28 4:48 ` tomas
2022-10-28 5:19 ` Jean Louis
2022-10-28 6:20 ` Michael Heerdegen
2022-10-28 13:09 ` Stefan Monnier via Users list for the GNU Emacs text editor
2022-10-29 6:10 ` Michael Heerdegen
2022-10-29 15:25 ` Stefan Monnier via Users list for the GNU Emacs text editor
2022-10-30 12:49 ` Emanuel Berg
2022-10-29 6:38 ` tomas
2022-10-30 12:48 ` Emanuel Berg
2022-10-29 9:20 ` Emanuel Berg
2022-10-29 9:19 ` Emanuel Berg
2022-10-27 4:01 ` Emanuel Berg
2022-10-25 12:05 ` Michael Heerdegen
2022-10-25 12:15 ` Emanuel Berg
2022-10-25 15:59 ` Drew Adams [this message]
2022-10-25 17:44 ` [External] : " Emanuel Berg
2022-10-26 15:39 ` Drew Adams
2022-10-26 17:43 ` Emanuel Berg
2022-10-25 17:25 ` Joost Kremers
2022-10-25 17:51 ` Emanuel Berg
2022-10-25 19:44 ` Heime
2022-10-25 20:08 ` Joost Kremers
2022-10-25 20:15 ` [External] : " Drew Adams
2022-10-25 20:19 ` Joost Kremers
2022-10-26 3:00 ` Stefan Monnier via Users list for the GNU Emacs text editor
-- strict thread matches above, loose matches on Subject: below --
2022-10-28 5:07 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=CO6PR10MB5473F9CA2255BBF750B1531CF3319@CO6PR10MB5473.namprd10.prod.outlook.com \
--to=drew.adams@oracle.com \
--cc=help-gnu-emacs@gnu.org \
--cc=michael_heerdegen@web.de \
/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.