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From: Jean Louis <bugs@gnu.support>
To: Heime <heimeborgia@protonmail.com>
Cc: Heime via Users list for the GNU Emacs text editor
	<help-gnu-emacs@gnu.org>
Subject: Re: Testing whether a list contains at least one non-nil element
Date: Tue, 25 Oct 2022 13:46:28 +0300	[thread overview]
Message-ID: <Y1e+hCGEye/jqAp/@protected.localdomain> (raw)
In-Reply-To: <yo_QhxmNXHgw-go3qtQ1ui_qIYcRf_DkxPMakizW3aIPSHkd2mugAnQtHcXK8W3WHla_NV0Kj73b4fbz8az1qv_3wkYIBzjgwYCuQ0wo8n0=@protonmail.com>

* Heime <heimeborgia@protonmail.com> [2022-10-25 13:18]:
> I would like to test whether a list contains at least one non-nil element?  If I do that, then
> I would be able to continue a loop where a non-nil element would mean that a match was found.

(cond ((memq nil '(1 2 nil)) (message "True, there is nil inside"))
      ((memq nil '(1 2 3)) (message "No, there is no nil inside"))) ⇒ "True, there is nil inside"


-- 
Jean

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  reply	other threads:[~2022-10-25 10:46 UTC|newest]

Thread overview: 38+ 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 [this message]
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
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

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