From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Emanuel Berg Newsgroups: gmane.emacs.help Subject: Re: Testing whether a list contains at least one non-nil element Date: Tue, 25 Oct 2022 19:51:26 +0200 Message-ID: <87v8o7pza9.fsf@dataswamp.org> References: <87r0yvst2a.fsf@fastmail.fm> Mime-Version: 1.0 Content-Type: text/plain Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="24780"; mail-complaints-to="usenet@ciao.gmane.io" User-Agent: Gnus/5.13 (Gnus v5.13) To: help-gnu-emacs@gnu.org Cancel-Lock: sha1:vbvIQQLKevgP9h2cIFelDfSmRvA= Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane-mx.org@gnu.org Wed Oct 26 14:51:51 2022 Return-path: Envelope-to: geh-help-gnu-emacs@m.gmane-mx.org Original-Received: from lists.gnu.org ([209.51.188.17]) by ciao.gmane.io with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1onfst-00068X-Gx for geh-help-gnu-emacs@m.gmane-mx.org; Wed, 26 Oct 2022 14:51:51 +0200 Original-Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1onfsD-0006cN-OS; Wed, 26 Oct 2022 08:51:09 -0400 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1onO5R-0004lH-IQ for help-gnu-emacs@gnu.org; Tue, 25 Oct 2022 13:51:37 -0400 Original-Received: from ciao.gmane.io ([116.202.254.214]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1onO5P-0004TR-RW for help-gnu-emacs@gnu.org; Tue, 25 Oct 2022 13:51:37 -0400 Original-Received: from list by ciao.gmane.io with local (Exim 4.92) (envelope-from ) id 1onO5N-000560-8L for help-gnu-emacs@gnu.org; Tue, 25 Oct 2022 19:51:33 +0200 X-Injected-Via-Gmane: http://gmane.org/ Mail-Followup-To: help-gnu-emacs@gnu.org Mail-Copies-To: never Received-SPF: pass client-ip=116.202.254.214; envelope-from=geh-help-gnu-emacs@m.gmane-mx.org; helo=ciao.gmane.io X-Spam_score_int: -15 X-Spam_score: -1.6 X-Spam_bar: - X-Spam_report: (-1.6 / 5.0 requ) BAYES_00=-1.9, HEADER_FROM_DIFFERENT_DOMAINS=0.25, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=no autolearn_force=no X-Spam_action: no action X-Mailman-Approved-At: Wed, 26 Oct 2022 08:51:08 -0400 X-BeenThere: help-gnu-emacs@gnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Users list for the GNU Emacs text editor List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Original-Sender: "help-gnu-emacs" Errors-To: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane-mx.org@gnu.org Xref: news.gmane.io gmane.emacs.help:140395 Archived-At: Joost Kremers wrote: >> 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. > > (seq-some (lambda (e) (not (null e))) mylist) > > or shorter: > > (not (seq-every-p #'null mylist)) Nope, at least the way I understood the question where the loop would continue at that position, but actually anyway those are not as good as (cl-position-if-not #'null '(nil nil)) ; nil (cl-position-if-not #'null '(nil 2)) ; 1 -- underground experts united https://dataswamp.org/~incal