From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Stefan Monnier via "Emacs development discussions." Newsgroups: gmane.emacs.devel Subject: Re: Instead of pcase Date: Fri, 24 Nov 2023 23:34:24 -0500 Message-ID: References: <87o7ftlaim.fsf@neko.mail-host-address-is-not-set> Reply-To: Stefan Monnier Mime-Version: 1.0 Content-Type: text/plain Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="11459"; mail-complaints-to="usenet@ciao.gmane.io" User-Agent: Gnus/5.13 (Gnus v5.13) To: emacs-devel@gnu.org Cancel-Lock: sha1:a9i1BprEfvngq09GHZ8zncg1SbU= Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Sat Nov 25 05:35:31 2023 Return-path: Envelope-to: ged-emacs-devel@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 1r6kO9-0002ql-WA for ged-emacs-devel@m.gmane-mx.org; Sat, 25 Nov 2023 05:35:30 +0100 Original-Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1r6kNI-0006dc-JP; Fri, 24 Nov 2023 23:34:36 -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 1r6kNH-0006dO-0f for emacs-devel@gnu.org; Fri, 24 Nov 2023 23:34:35 -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 1r6kNF-0005wL-Lg for emacs-devel@gnu.org; Fri, 24 Nov 2023 23:34:34 -0500 Original-Received: from list by ciao.gmane.io with local (Exim 4.92) (envelope-from ) id 1r6kND-0001Rc-AF for emacs-devel@gnu.org; Sat, 25 Nov 2023 05:34:31 +0100 X-Injected-Via-Gmane: http://gmane.org/ Received-SPF: pass client-ip=116.202.254.214; envelope-from=ged-emacs-devel@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=0.25, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=no autolearn_force=no X-Spam_action: no action X-BeenThere: emacs-devel@gnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "Emacs development discussions." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Original-Sender: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Xref: news.gmane.io gmane.emacs.devel:313194 Archived-At: > (let ((exp (if t '(foo . "str") '(bar . 7)))) > (cl-case (car exp) > (foo > (when-let ((d (cdr exp))) > (concat "str" val))) > (bar > (when-let ((d (cdr exp))) > (1+ val))))) AKA (let ((exp (if t '(foo . "str") '(bar . 7)))) (case (car exp) ('foo (when-let ((d (cdr exp))) (concat "str" val))) ('bar (when-let ((d (cdr exp))) (1+ val))))) Funnily enough this quoting of the values against which we want to match is so natural for coders not familiar with `cl-case` that we went through some efforts to try and detect their mis-use. So at least for some coders, in the above case, the `pcase` syntax is the more natural one :-) Stefan