From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Heime Newsgroups: gmane.emacs.help Subject: Re: cond construct for situation when a variable is t Date: Tue, 22 Aug 2023 12:32:28 +0000 Message-ID: References: <87o7j2d6yd.fsf@dataswamp.org> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="31874"; mail-complaints-to="usenet@ciao.gmane.io" Cc: help-gnu-emacs@gnu.org To: Emanuel Berg Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane-mx.org@gnu.org Tue Aug 22 14:33:48 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 1qYQZv-00083V-JX for geh-help-gnu-emacs@m.gmane-mx.org; Tue, 22 Aug 2023 14:33:47 +0200 Original-Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1qYQZI-0004BQ-9A; Tue, 22 Aug 2023 08:33:09 -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 1qYQZ0-00049l-9f for help-gnu-emacs@gnu.org; Tue, 22 Aug 2023 08:32:52 -0400 Original-Received: from mail-4325.protonmail.ch ([185.70.43.25]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1qYQYx-0003lm-6z for help-gnu-emacs@gnu.org; Tue, 22 Aug 2023 08:32:50 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=protonmail.com; s=protonmail3; t=1692707563; x=1692966763; bh=5NVGH2DAhEaY8Hfi8GlEyj+Ij7J5iY5++bFc8+zkipY=; h=Date:To:From:Cc:Subject:Message-ID:In-Reply-To:References: Feedback-ID:From:To:Cc:Date:Subject:Reply-To:Feedback-ID: Message-ID:BIMI-Selector; b=qcpJIr18QpC9puFAbl9KEWuaVQApJhn+LQ2OZyR7f52r/LTYsBNgxUAVHmM9l5bk8 k3/uyVrZiVrHbcHVugQJ3gtVbZuMQ+tmpdM5XbnrMcLfbs1vtKSNudjhH3W2jjfLz8 52zYIZE6Kx3pBEfZb8xTy1hf7wrZlTpH7UTXdKrQSQJvUWwQxBMxD9NUO2nwAHKtJp oAT3vybZ5DdNUy9ZvO0CI4nIHtodiFYOHzJRaoSMM1f0G7vBcisVCcyh+5exvFmEww shkx/HLvDwpc67yo/XspN2rdUhy/+Uhbqh++vZ9uIuzZsjLWlJZrZKkU4dDWXa/7ks L0kZBlAMbdjKg== In-Reply-To: <87o7j2d6yd.fsf@dataswamp.org> Feedback-ID: 57735886:user:proton Received-SPF: pass client-ip=185.70.43.25; envelope-from=heimeborgia@protonmail.com; helo=mail-4325.protonmail.ch X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, RCVD_IN_MSPIKE_H5=0.001, RCVD_IN_MSPIKE_WL=0.001, 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-bounces+geh-help-gnu-emacs=m.gmane-mx.org@gnu.org Xref: news.gmane.io gmane.emacs.help:144912 Archived-At: Sent with Proton Mail secure email. ------- Original Message ------- On Wednesday, August 23rd, 2023 at 12:10 AM, Emanuel Berg wrote: > Heime wrote: >=20 > > How can I use the 'cond' construct for the case when > > a variable is 't' ? >=20 >=20 > It could look like this but in practice one would probably put > it in another way, that looks better. >=20 > (setq var nil) >=20 > (cond > (var 1) > ((not var) 0) ) >=20 > > I can set a variable to boolean true using (setq var t), am > > I right ? >=20 >=20 > You can, you totally can. Just don't `setq' t to anything ;) >=20 > -- > underground experts united > https://dataswamp.org/~incal I am getting somewhat confused after your comments Emanuel. There is no=20 'boolean datatype' in elisp. With nil and empty list () being false,=20 anything else is true. That t is used for true, is that by convention ? Should t be used, or is it unreliable ?