From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Heime Newsgroups: gmane.emacs.help Subject: RE: [External] : Re: Easy to add with push but not to the end of a list Date: Mon, 28 Nov 2022 22:18:18 +0000 Message-ID: <8_NTlRuvl09d4xR8LNJtkEjDfIRIXe2slBhexR8Mfr1YpTD0jqcLcgaUfrQith_p8ixmZHAq-Tigf-ca3QrktLHjdJwqPm2nUO0xQEmihwk=@protonmail.com> References: <87k03e97fg.fsf@dataswamp.org> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="31116"; mail-complaints-to="usenet@ciao.gmane.io" Cc: Emanuel Berg , "help-gnu-emacs@gnu.org" To: Drew Adams Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane-mx.org@gnu.org Mon Nov 28 23:19:16 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 1ozmT5-0007qc-Tx for geh-help-gnu-emacs@m.gmane-mx.org; Mon, 28 Nov 2022 23:19:15 +0100 Original-Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1ozmSR-00014W-IA; Mon, 28 Nov 2022 17:18:35 -0500 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 1ozmSO-00014E-BE for help-gnu-emacs@gnu.org; Mon, 28 Nov 2022 17:18:32 -0500 Original-Received: from mail-4324.protonmail.ch ([185.70.43.24]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1ozmSM-0004eg-9w for help-gnu-emacs@gnu.org; Mon, 28 Nov 2022 17:18:32 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=protonmail.com; s=protonmail3; t=1669673907; x=1669933107; bh=LJ2VtvSr8r+UM+W6Yv3UdbaGiFHL/FDAucPuuKWi6SQ=; h=Date:To:From:Cc:Subject:Message-ID:In-Reply-To:References: Feedback-ID:From:To:Cc:Date:Subject:Reply-To:Feedback-ID: Message-ID:BIMI-Selector; b=LAwAwvN9o8bmVJS8K1Mlt04JbM3tEpoMT3zXksqRW+FCDW/8qEa+kwXh7QsqyFWwa 5Xs2sfMfSSat7G3UFkaeNvaRdLO/5grJd3DpTPbI0sfyTmfCJLsIg7/PXtFeRl9hxa tM3UMmor76efBeMjXxTeOpMjiW8btwLq0vXw8IMC45qXfcDv6YqkAIO8f0+cJmwmhP peXxZAcxK2pfDD0yQI7ruyuHEmFfzQTtkDzigw4oawEQchUqgC1Ajorn1k8YNZuxqd EQxhUUw8GxyOPRlU6ATp9JL1ZJdyfDT1DcFp3bl2YhBaXuHb2ehqVqkzU5Byqiq/P8 5oAEuGmf2fRoQ== In-Reply-To: Feedback-ID: 57735886:user:proton Received-SPF: pass client-ip=185.70.43.24; envelope-from=heimeborgia@protonmail.com; helo=mail-4324.protonmail.ch X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, RCVD_IN_MSPIKE_H2=-0.001, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action 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: , Errors-To: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane-mx.org@gnu.org Original-Sender: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane-mx.org@gnu.org Xref: news.gmane.io gmane.emacs.help:141228 Archived-At: ------- Original Message ------- On Monday, November 28th, 2022 at 9:56 PM, Drew Adams wrote: > > I agree there should be such a function in vanilla Emacs. > > Maybe something like this? > >=20 > > (defun push-last (elem lst) > > (when (listp lst) > > (setcdr (last lst) (list elem)) > > lst)) >=20 >=20 > As I said, there are umpteen different meanings / > behaviors for "add an element to the end of a list". >=20 > (setcdr (last lst) (list elem)) is one such behavior. >=20 > And that's just as succinct as (push-last elem lst), > and clearer. It makes crystal clear that you're > opting for list modification. There are never any qualms about putting something at the beginning=20 of a list. One should not take a different attitude to adding after=20 the last entry.