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: Thu, 19 Aug 2021 09:21:10 +0300 Message-ID: References: <875yw2vxqh.fsf@mbork.pl> 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="9278"; mail-complaints-to="usenet@ciao.gmane.io" User-Agent: Mutt/2.0.7+183 (3d24855) (2021-05-28) Cc: Help Gnu Emacs mailing list To: Marcin Borkowski Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane-mx.org@gnu.org Thu Aug 19 08:25:55 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 1mGbUx-0002Ap-EV for geh-help-gnu-emacs@m.gmane-mx.org; Thu, 19 Aug 2021 08:25:55 +0200 Original-Received: from localhost ([::1]:40544 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1mGbUw-0002OZ-6V for geh-help-gnu-emacs@m.gmane-mx.org; Thu, 19 Aug 2021 02:25:54 -0400 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:38694) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1mGbU5-0002ON-WF for help-gnu-emacs@gnu.org; Thu, 19 Aug 2021 02:25:02 -0400 Original-Received: from stw1.rcdrun.com ([217.170.207.13]:59475) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1mGbU4-0002pC-8D for help-gnu-emacs@gnu.org; Thu, 19 Aug 2021 02:25:01 -0400 Original-Received: from localhost ([::ffff:154.225.131.243]) (AUTH: PLAIN admin, TLS: TLS1.3,256bits,ECDHE_RSA_AES_256_GCM_SHA384) by stw1.rcdrun.com with ESMTPSA id 0000000000069CB4.00000000611DF936.00001743; Wed, 18 Aug 2021 23:24:54 -0700 Mail-Followup-To: Marcin Borkowski , Help Gnu Emacs mailing list Content-Disposition: inline In-Reply-To: <875yw2vxqh.fsf@mbork.pl> 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:132606 Archived-At: * Marcin Borkowski [2021-08-19 07:57]: > Well, of course a string and a symbol can never be `equal', but they can > be `string='. But what if both arguments are strings? The docstrings > seem to imply that you can use `equal' and `string=' interchangeably and > they will always give the exact same result. Is that correct? (string-equal 123 "123") -- gives error, as string= is alias for string-equal that is to handle exclusively strings. (equalp 123 "123") -- does not give error. Sometimes program outputs different types, could be `nil' or `string' and those outputs maybe need to be expected as any type or as exclusively strings. That is where the difference comes handy, as sometimes I do want to get error report. If I wish to test strings I better use `string=' -- Jean Take action in Free Software Foundation campaigns: https://www.fsf.org/campaigns In support of Richard M. Stallman https://stallmansupport.org/