From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Jean Louis Newsgroups: gmane.emacs.help Subject: Re: [External] : Re: operations on path lists Date: Sat, 4 Feb 2023 21:32:10 +0300 Message-ID: References: <87y1pdkg6p.fsf@dataswamp.org> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="1657"; mail-complaints-to="usenet@ciao.gmane.io" User-Agent: Mutt/2.2.9+54 (af2080d) (2022-11-21) 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 Sat Feb 04 19:52:48 2023 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 1pONeZ-0000E2-Vy for geh-help-gnu-emacs@m.gmane-mx.org; Sat, 04 Feb 2023 19:52:47 +0100 Original-Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1pONdr-0004nd-OJ; Sat, 04 Feb 2023 13:52:03 -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 1pONdp-0004n8-QT for help-gnu-emacs@gnu.org; Sat, 04 Feb 2023 13:52:01 -0500 Original-Received: from stw1.rcdrun.com ([217.170.207.13]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1pONdo-0008Bq-4x for help-gnu-emacs@gnu.org; Sat, 04 Feb 2023 13:52:01 -0500 Original-Received: from localhost ([::ffff:197.239.9.104]) (AUTH: PLAIN admin, TLS: TLS1.3,256bits,ECDHE_RSA_AES_256_GCM_SHA384) by stw1.rcdrun.com with ESMTPSA id 0000000000103957.0000000063DEA951.000035E6; Sat, 04 Feb 2023 11:52:00 -0700 Mail-Followup-To: Drew Adams , Emanuel Berg , "help-gnu-emacs@gnu.org" Content-Disposition: inline In-Reply-To: Received-SPF: pass client-ip=217.170.207.13; envelope-from=bugs@gnu.support; helo=stw1.rcdrun.com 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_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:142602 Archived-At: * Drew Adams [2023-02-04 20:23]: > > > (cond ((file-directory-p file) (expand-file-name file)) > > > (t nil)) > > > > (when (file-directory-p file) (expand-file-name file) ) > > (and (file-directory-p file) (expand-file-name file)) > > Use `when' when the return value isn't important. > Helps human readers. I understand the idea, and I found `cond' serves that purpose better. So I follow the same purpose in the essence. In that particular example, the return value would be rather hidden and implied from `when'. For me that is not same as when the value is visible, such as `nil'. So those are differences in view points on what is helpful to human reader or not. If reader is familiar with `when' and not with `cond' it will be easier, but if readier is familiar with `cond' maybe that is easier. -- Jean Take action in Free Software Foundation campaigns: https://www.fsf.org/campaigns In support of Richard M. Stallman https://stallmansupport.org/