From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Emanuel Berg via Users list for the GNU Emacs text editor Newsgroups: gmane.emacs.help Subject: Re: append, push, and add-to-list. Date: Sun, 04 Jul 2021 18:19:14 +0200 Message-ID: <8735suaw71.fsf@zoho.eu> References: Reply-To: Emanuel Berg Mime-Version: 1.0 Content-Type: text/plain Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="8303"; mail-complaints-to="usenet@ciao.gmane.io" User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/28.0.50 (gnu/linux) To: help-gnu-emacs@gnu.org Cancel-Lock: sha1:VEsEWjO+OKfOo+SR4B3LiCCPlRA= Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane-mx.org@gnu.org Sun Jul 04 18:19:46 2021 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 1m04qQ-0001x0-7f for geh-help-gnu-emacs@m.gmane-mx.org; Sun, 04 Jul 2021 18:19:46 +0200 Original-Received: from localhost ([::1]:45240 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1m04qP-0001bT-AI for geh-help-gnu-emacs@m.gmane-mx.org; Sun, 04 Jul 2021 12:19:45 -0400 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:51428) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1m04q7-0001bI-EJ for help-gnu-emacs@gnu.org; Sun, 04 Jul 2021 12:19:27 -0400 Original-Received: from ciao.gmane.io ([116.202.254.214]:54540) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1m04q5-0000e2-LG for help-gnu-emacs@gnu.org; Sun, 04 Jul 2021 12:19:27 -0400 Original-Received: from list by ciao.gmane.io with local (Exim 4.92) (envelope-from ) id 1m04q3-0001XI-J8 for help-gnu-emacs@gnu.org; Sun, 04 Jul 2021 18:19:23 +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-BeenThere: help-gnu-emacs@gnu.org X-Mailman-Version: 2.1.23 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" Xref: news.gmane.io gmane.emacs.help:131457 Archived-At: Hongyi Zhao wrote: > I've noticed there are some similar functions, i.e., append, > push, and add-to-list, for revising/updating the content of > a list. But I'm still not so clear on the specific use > scenarios for them. Consider the following command [1] `nconc', `cl-pushnew', (setq lst `(,@lst el)) ... > [...] Which methods are preferable? Good question, perhaps in the manual somewhere they listed and explained all in one place, if not, the help (`C-h f') should be your friend. But my intuition tells me, just because there are many options a, b, ..., and z, that doesn't mean necessarily that one is optimal for that situation. -- underground experts united https://dataswamp.org/~incal