From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Alan Mackenzie Newsgroups: gmane.emacs.devel Subject: Re: Is there already an alist function which gets all matching elements, not just the first? Date: Thu, 6 Oct 2022 18:24:29 +0000 Message-ID: References: <87bkqq8s7n.fsf@gmail.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="28164"; mail-complaints-to="usenet@ciao.gmane.io" Cc: emacs-devel@gnu.org To: Robert Pluim Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Thu Oct 06 20:53:42 2022 Return-path: Envelope-to: ged-emacs-devel@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 1ogW05-0007DW-VI for ged-emacs-devel@m.gmane-mx.org; Thu, 06 Oct 2022 20:53:41 +0200 Original-Received: from localhost ([::1]:36904 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1ogW05-00065S-0S for ged-emacs-devel@m.gmane-mx.org; Thu, 06 Oct 2022 14:53:41 -0400 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:36848) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1ogVY7-0002Ud-21 for emacs-devel@gnu.org; Thu, 06 Oct 2022 14:24:47 -0400 Original-Received: from mx3.muc.de ([193.149.48.5]:56272) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1ogVY4-0001Su-C1 for emacs-devel@gnu.org; Thu, 06 Oct 2022 14:24:46 -0400 Original-Received: (qmail 34239 invoked by uid 3782); 6 Oct 2022 20:24:30 +0200 Original-Received: from acm.muc.de (p4fe1585e.dip0.t-ipconnect.de [79.225.88.94]) (using STARTTLS) by colin.muc.de (tmda-ofmipd) with ESMTP; Thu, 06 Oct 2022 20:24:29 +0200 Original-Received: (qmail 8365 invoked by uid 1000); 6 Oct 2022 18:24:29 -0000 Content-Disposition: inline In-Reply-To: <87bkqq8s7n.fsf@gmail.com> X-Submission-Agent: TMDA/1.3.x (Ph3nix) X-Primary-Address: acm@muc.de Received-SPF: pass client-ip=193.149.48.5; envelope-from=acm@muc.de; helo=mx3.muc.de X-Spam_score_int: -18 X-Spam_score: -1.9 X-Spam_bar: - X-Spam_report: (-1.9 / 5.0 requ) BAYES_00=-1.9, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: emacs-devel@gnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "Emacs development discussions." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Original-Sender: "Emacs-devel" Xref: news.gmane.io gmane.emacs.devel:297113 Archived-At: Hello, Robert. On Wed, Oct 05, 2022 at 12:45:00 +0200, Robert Pluim wrote: > >>>>> On Wed, 5 Oct 2022 10:00:10 +0000, Alan Mackenzie said: > Alan> Hello, Emacs. > Alan> I want to be able to get all matching elements from an alist (thinking > Alan> about extending imenu). Something like > Alan> (assoc-all key list) > Alan> which would return a list of matches. After all, we have functions > Alan> which _delete_ all matches from an alist. > Alan> Does such a function already exist, perhaps in cl-*.el? > Just use assoc-delete-all and invert the test: > (assoc-delete-all mykey myalist (lambda (val key) > (not (eq val key)))) Thanks for the idea! But I'd have to copy the alist first, and then it starts to look a bit contrived. Maybe I should just write a straightforward loop to get this info. > Robert > -- -- Alan Mackenzie (Nuremberg, Germany).