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: Functions with multiple optional arguments Date: Mon, 17 Oct 2022 07:05:14 +0300 Message-ID: References: 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="574"; mail-complaints-to="usenet@ciao.gmane.io" User-Agent: Mutt/2.2.7+37 (a90f69b) (2022-09-02) Cc: "help-gnu-emacs@gnu.org" To: Heime Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane-mx.org@gnu.org Mon Oct 17 06:08:10 2022 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 1okHQA-000AXi-Hj for geh-help-gnu-emacs@m.gmane-mx.org; Mon, 17 Oct 2022 06:08:10 +0200 Original-Received: from localhost ([::1]:34598 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1okHQ9-0002lc-6R for geh-help-gnu-emacs@m.gmane-mx.org; Mon, 17 Oct 2022 00:08:09 -0400 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:34870) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1okHOj-0002ee-U5 for help-gnu-emacs@gnu.org; Mon, 17 Oct 2022 00:06:42 -0400 Original-Received: from stw1.rcdrun.com ([217.170.207.13]:51331) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1okHNa-0004kG-6t for help-gnu-emacs@gnu.org; Mon, 17 Oct 2022 00:05:31 -0400 Original-Received: from localhost ([::ffff:102.87.19.13]) (AUTH: PLAIN admin, TLS: TLS1.3,256bits,ECDHE_RSA_AES_256_GCM_SHA384) by stw1.rcdrun.com with ESMTPSA id 00000000000561CF.00000000634CD489.00006F18; Sun, 16 Oct 2022 21:05:28 -0700 Mail-Followup-To: Heime , "help-gnu-emacs@gnu.org" Content-Disposition: inline In-Reply-To: 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: 2.1.29 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" Xref: news.gmane.io gmane.emacs.help:140058 Archived-At: * Heime via Users list for the GNU Emacs text editor [2022-10-17 00:06]: > Have been writing a function that has two optional arguments. It is > turning out to be a difficult task in situations when one in missing > an argument. Anybody has experience about this, as I have not seen > much code with multiple optional arguments. If argument is optional but required by your function, I use this method: (defun my-fun (&optional title description) (let ((title (or title "Best Movie")) (description (or description "Description"))) (message "%s: %s" title description))) (my-fun) -- Jean Take action in Free Software Foundation campaigns: https://www.fsf.org/campaigns In support of Richard M. Stallman https://stallmansupport.org/