From: Drew Adams <drew.adams@oracle.com>
To: Emanuel Berg <incal@dataswamp.org>,
"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: Wed, 26 Oct 2022 15:39:16 +0000 [thread overview]
Message-ID: <CO6PR10MB5473A5E7FD6BF5D077B7C68DF3309@CO6PR10MB5473.namprd10.prod.outlook.com> (raw)
In-Reply-To: <878rl3re70.fsf@dataswamp.org>
> > (cl-member-if-not #'null toto)
>
> Close
> (cl-member-if-not #'null '(nil nil)) ; nil
> (cl-member-if-not #'null '(nil 2)) ; (2)
>
> But
> (cl-position-if-not #'null '(nil nil)) ; nil
> (cl-position-if-not #'null '(nil 2)) ; 1
The request was for a test of whether the input
list contains any non-nil elements. Yes, both
`cl-member-if-not' and `cl-position-if-not' can
do that. Or `cl-member-if' and `cl-position-if',
passing #'identity.
There are lots of ways to do it.
next prev parent reply other threads:[~2022-10-26 15:39 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 ` [External] : " Drew Adams
2022-10-25 17:44 ` Emanuel Berg
2022-10-26 15:39 ` Drew Adams [this message]
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
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