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: Is there any difference between `equal' and `string=' for strings? Date: Fri, 20 Aug 2021 08:25:16 +0300 Message-ID: References: <875yw2vxqh.fsf@mbork.pl> <87v941domi.fsf@zoho.eu> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="12993"; mail-complaints-to="usenet@ciao.gmane.io" User-Agent: Mutt/2.0.7+183 (3d24855) (2021-05-28) To: help-gnu-emacs@gnu.org Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane-mx.org@gnu.org Fri Aug 20 07:28:48 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 1mGx5E-0003B5-0f for geh-help-gnu-emacs@m.gmane-mx.org; Fri, 20 Aug 2021 07:28:48 +0200 Original-Received: from localhost ([::1]:36770 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1mGx5B-0008JU-Oj for geh-help-gnu-emacs@m.gmane-mx.org; Fri, 20 Aug 2021 01:28:45 -0400 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:57512) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1mGx4k-0008JM-Ju for help-gnu-emacs@gnu.org; Fri, 20 Aug 2021 01:28:18 -0400 Original-Received: from stw1.rcdrun.com ([217.170.207.13]:39589) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1mGx4h-00084C-Tq for help-gnu-emacs@gnu.org; Fri, 20 Aug 2021 01:28:18 -0400 Original-Received: from localhost ([::ffff:154.230.131.13]) (AUTH: PLAIN admin, TLS: TLS1.3,256bits,ECDHE_RSA_AES_256_GCM_SHA384) by stw1.rcdrun.com with ESMTPSA id 0000000000069CB5.00000000611F3D6D.00004D03; Thu, 19 Aug 2021 22:28:12 -0700 Mail-Followup-To: help-gnu-emacs@gnu.org Content-Disposition: inline In-Reply-To: <87v941domi.fsf@zoho.eu> 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: 2.1.23 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:132620 Archived-At: * Emanuel Berg via Users list for the GNU Emacs text editor [2021-08-20 02:04]: > Marcin Borkowski wrote: > > > Well, of course a string and a symbol can never be `equal', > > but they can be `string='. But what if both arguments > > are strings? > > ... and if both arguments are symbols? > > (string= 'hi 'hi) ; t > > (Why ever one would use `string=' for that.) > > Yeah, it is a jungle all that ... How I understand it, it is good also for comparison of symbols as strings. (setq s1 "Jane") ⇒ "Jane" (setq s2 "Jane") ⇒ "Jane" (setq s3 "Doe") ⇒ "Doe" Then this is how I understand the intended purpose: (string= s1 s2) ⇒ t (string= s1 s3) ⇒ nil And of course you are free to compare empty symbols: (string= 'hi 'hi) ⇒ t However by looking at the purpose it becomes all logical to me. -- Jean Take action in Free Software Foundation campaigns: https://www.fsf.org/campaigns In support of Richard M. Stallman https://stallmansupport.org/