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: Is there any difference between `equal' and `string=' for strings? Date: Fri, 20 Aug 2021 01:14:37 +0200 Message-ID: <87r1epdo2q.fsf@zoho.eu> References: <875yw2vxqh.fsf@mbork.pl> 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="29950"; 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:hYas136gc34ST7gNiwZ8olJTYzQ= Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane-mx.org@gnu.org Fri Aug 20 01:15:52 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 1mGrGK-0007an-E0 for geh-help-gnu-emacs@m.gmane-mx.org; Fri, 20 Aug 2021 01:15:52 +0200 Original-Received: from localhost ([::1]:56594 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1mGrGI-00067H-Vk for geh-help-gnu-emacs@m.gmane-mx.org; Thu, 19 Aug 2021 19:15:50 -0400 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:60462) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1mGrFP-000679-GK for help-gnu-emacs@gnu.org; Thu, 19 Aug 2021 19:14:55 -0400 Original-Received: from ciao.gmane.io ([116.202.254.214]:46642) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1mGrFN-0006gk-Lu for help-gnu-emacs@gnu.org; Thu, 19 Aug 2021 19:14:55 -0400 Original-Received: from list by ciao.gmane.io with local (Exim 4.92) (envelope-from ) id 1mGrFJ-0006He-Nh for help-gnu-emacs@gnu.org; Fri, 20 Aug 2021 01:14:49 +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: -16 X-Spam_score: -1.7 X-Spam_bar: - X-Spam_report: (-1.7 / 5.0 requ) BAYES_00=-1.9, HEADER_FROM_DIFFERENT_DOMAINS=0.249, 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:132619 Archived-At: Jean Louis wrote: > (string-equal 123 "123") -- gives error, as string= is alias > for string-equal that is to handle exclusively strings. Nope, you can pass symbols as well: (string= "hi" "hi") ; t (string= 'hi "hi") ; t (string= 'hi 'hi ) ; t > (equalp 123 "123") `equalp'? Aren't you the one who doesn't like Elisp CL? Anyway careful with `equalp' for strings, note that (cl-equalp "Hi" "hi") ; t but (string= "Hi" "hi") ; nil > 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=' It is a jungle, the rule of thumb I think is `eq' to answer the question "is it the same Lisp object"? `=' to compare numbers in the math sense `string=' for strings only `equal' for everything else, except ... `cl-equalp' I give up ;) -- underground experts united https://dataswamp.org/~incal