From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: carlmarcos--- via Users list for the GNU Emacs text editor Newsgroups: gmane.emacs.help Subject: Re: Generality of defvar Date: Wed, 27 Jul 2022 08:59:19 +0200 (CEST) Message-ID: References: <874jz3sbvm.fsf@dataswamp.org> Reply-To: carlmarcos@tutanota.com 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="38455"; mail-complaints-to="usenet@ciao.gmane.io" Cc: help-gnu-emacs@gnu.org To: Yuri Khan Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane-mx.org@gnu.org Wed Jul 27 09:21:24 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 1oGbMB-0009nN-Lr for geh-help-gnu-emacs@m.gmane-mx.org; Wed, 27 Jul 2022 09:21:23 +0200 Original-Received: from localhost ([::1]:36070 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1oGbMA-0001gV-C0 for geh-help-gnu-emacs@m.gmane-mx.org; Wed, 27 Jul 2022 03:21:22 -0400 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:40100) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1oGb0u-0004cq-JC for help-gnu-emacs@gnu.org; Wed, 27 Jul 2022 02:59:24 -0400 Original-Received: from w1.tutanota.de ([81.3.6.162]:34180) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1oGb0r-0004zY-MD for help-gnu-emacs@gnu.org; Wed, 27 Jul 2022 02:59:24 -0400 Original-Received: from w3.tutanota.de (unknown [192.168.1.164]) by w1.tutanota.de (Postfix) with ESMTP id C2223FBF8AE; Wed, 27 Jul 2022 06:59:19 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; t=1658905159; s=s1; d=tutanota.com; h=From:From:To:To:Subject:Subject:Content-Description:Content-ID:Content-Type:Content-Type:Content-Transfer-Encoding:Content-Transfer-Encoding:Cc:Cc:Date:Date:In-Reply-To:In-Reply-To:MIME-Version:MIME-Version:Message-ID:Message-ID:Reply-To:References:References:Sender; bh=r/A1/2WCxruV4Bq2yhjxy0/kDVc2Mhuj62+0B5w7iDE=; b=zrlktM9Yy3B+78OIcuOAlFE5rzoTr8GdLXPGqzTHIN5/hWnt+Qa//oE8hO2kiAkH oOg4gXwQS/x0/Ll4/u0hoJHrEraNdp3SJ41ygTdKHjxUBb8RrIfTpYGyMvEvIeLu9M6 Cfn/UFYyZSJFiLKZ5xUy8taSK3kmgTpZM9uuaFThvZIDPY3hCE75p76pGNg8VTVONcN RHA+emdVzleDJ5TNcbiTeAcOz9d5YrD7yVNvGlk1f0ciiAmfAFulJKl8PlKqBLI57P3 2hbugQVmzVSLW10odeYMumkVAlVnuOCx4KfE9rU9aDiaNQrR69KE7NKbvPM7qR2LUoD RpcWPuP5xw== In-Reply-To: Received-SPF: pass client-ip=81.3.6.162; envelope-from=carlmarcos@tutanota.com; helo=w1.tutanota.de 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, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 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:138639 Archived-At: Jul 27, 2022, 04:57 by yuri.v.khan@gmail.com: > On Wed, 27 Jul 2022 at 06:17, Emanuel Berg wrote: > >> For practical reasons it can be better to do >> >> (defvar var-name) >> (setq var-name 'var-value) >> >> instead because if you do something with that and want to >> reset it, it's enough to evaluate the second line, whereas if >> you just have the first line you tend to evaluate that one and >> if/because the variable is already set at that point then >> nothing will happen ... >> > > Yes, but you can press C-M-x on a (defvar var-name 'var-value) and it > will get re-set to the new value even if the variable is already > defined. > So I can keep it (defvar var-name t) or (defvar var-name nil)