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: [External] : Re: operations on path lists Date: Sat, 04 Feb 2023 22:51:23 +0100 Message-ID: <87k00xje04.fsf@dataswamp.org> References: <87y1pdkg6p.fsf@dataswamp.org> Mime-Version: 1.0 Content-Type: text/plain Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="12124"; mail-complaints-to="usenet@ciao.gmane.io" User-Agent: Gnus/5.13 (Gnus v5.13) To: help-gnu-emacs@gnu.org Cancel-Lock: sha1:TCTfPEWwXeXo1BLEG9QI2Jkxd1E= Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane-mx.org@gnu.org Sun Feb 05 14:15:36 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 1pOero-0002ux-47 for geh-help-gnu-emacs@m.gmane-mx.org; Sun, 05 Feb 2023 14:15:36 +0100 Original-Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1pOerf-0004MZ-DZ; Sun, 05 Feb 2023 08:15:28 -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 1pOQV7-0007b5-Eu for help-gnu-emacs@gnu.org; Sat, 04 Feb 2023 16:55:13 -0500 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 1pOQUx-00036B-H9 for help-gnu-emacs@gnu.org; Sat, 04 Feb 2023 16:55:05 -0500 Original-Received: from list by ciao.gmane.io with local (Exim 4.92) (envelope-from ) id 1pOQUw-0000hc-1f for help-gnu-emacs@gnu.org; Sat, 04 Feb 2023 22:55:02 +0100 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: Sun, 05 Feb 2023 08:15:24 -0500 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:142611 Archived-At: Jean Louis wrote: >>>> (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. The reader ... you, the writer, should write as good code as possible, that will benefit everyone the same way. -- underground experts united https://dataswamp.org/~incal