From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Emanuel Berg Newsgroups: gmane.emacs.help Subject: Re: Passing optional arguments for use with internal functions Date: Wed, 02 Aug 2023 20:20:41 +0200 Message-ID: <87leetl30m.fsf@dataswamp.org> References: <0Ezo2Srah2_DE-D1XG3MBYVEmAvnfHLu8cKpS3oJa4Hn5ADeV7sBbHFTtIzRAFv461O5XlpcjkyImCJHO7DKvaM492vQW7cz9wXL_VaDAdQ=@proton.me> <87tttoux4p.fsf@dataswamp.org> <87o7jwufju.fsf@dataswamp.org> <87y1iwe06a.fsf@dataswamp.org> Mime-Version: 1.0 Content-Type: text/plain Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="40047"; mail-complaints-to="usenet@ciao.gmane.io" User-Agent: Gnus/5.13 (Gnus v5.13) To: help-gnu-emacs@gnu.org Cancel-Lock: sha1:xDIinP5Dn4N2ecjvlvj6JHvrkjk= Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane-mx.org@gnu.org Wed Aug 02 21:20:18 2023 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 1qRHOM-000ACw-Pl for geh-help-gnu-emacs@m.gmane-mx.org; Wed, 02 Aug 2023 21:20:18 +0200 Original-Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1qRHOF-00074J-H0; Wed, 02 Aug 2023 15:20:11 -0400 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 1qRGSv-0004TA-Ph for help-gnu-emacs@gnu.org; Wed, 02 Aug 2023 14:20:57 -0400 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 1qRGSt-0006dR-Si for help-gnu-emacs@gnu.org; Wed, 02 Aug 2023 14:20:57 -0400 Original-Received: from list by ciao.gmane.io with local (Exim 4.92) (envelope-from ) id 1qRGSp-0004rV-Lg for help-gnu-emacs@gnu.org; Wed, 02 Aug 2023 20:20:51 +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, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=no autolearn_force=no X-Spam_action: no action X-Mailman-Approved-At: Wed, 02 Aug 2023 15:20:10 -0400 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-bounces+geh-help-gnu-emacs=m.gmane-mx.org@gnu.org Xref: news.gmane.io gmane.emacs.help:144559 Archived-At: uzibalqa wrote: > To be absolutely sure I understand. If I want to default > a function optional argument if it is not used, the command > to that that is > > (defun dothis x () > (or x (setq x 8)) ; [...] > (do-something x) > ) > > And this would always work. In will work if I use the > lexical-binding directive at the top of a file. And it would > work if I use dynamic-binding directive at the top of > a file. Correct, as that wouldn't affect them because function formal parameters (the argument placeholders) are always under lexical/static scope. > Calling the command (dothis) will always use x with value 8, > and executing (do-something 8) . Yes, you forgot about the &optional keyword in your example but other than that it is correct. -- underground experts united https://dataswamp.org/~incal