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: Understanding the "let" construct and the setting of variables Date: Fri, 18 Dec 2020 21:12:16 +0300 Message-ID: References: <873603164g.fsf@zoho.eu> 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="39097"; mail-complaints-to="usenet@ciao.gmane.io" User-Agent: Mutt/2.0 (3d08634) (2020-11-07) To: help-gnu-emacs@gnu.org Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane-mx.org@gnu.org Fri Dec 18 19:17:24 2020 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 1kqKJf-000A3B-Id for geh-help-gnu-emacs@m.gmane-mx.org; Fri, 18 Dec 2020 19:17:23 +0100 Original-Received: from localhost ([::1]:50974 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1kqKJe-0003qa-Jo for geh-help-gnu-emacs@m.gmane-mx.org; Fri, 18 Dec 2020 13:17:22 -0500 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:49084) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1kqKIL-0003qB-9U for help-gnu-emacs@gnu.org; Fri, 18 Dec 2020 13:16:01 -0500 Original-Received: from stw1.rcdrun.com ([217.170.207.13]:43701) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1kqKIJ-0006yj-Hp for help-gnu-emacs@gnu.org; Fri, 18 Dec 2020 13:16:01 -0500 Original-Received: from localhost ([::ffff:41.202.241.37]) (AUTH: PLAIN securesender, TLS: TLS1.2,256bits,ECDHE_RSA_AES_256_GCM_SHA384) by stw1.rcdrun.com with ESMTPSA id 000000000001E537.000000005FDCF1DD.00002C15; Fri, 18 Dec 2020 11:15:57 -0700 Content-Disposition: inline In-Reply-To: <873603164g.fsf@zoho.eu> 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: 2.1.23 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:126517 Archived-At: * Emanuel Berg via Users list for the GNU Emacs text editor [2020-12-18 18:43]: > > 3. if that isn't enough to use let/let* because several > functions need to access a variable, use `setq' at the base > level (i.e., first char of the line, or column 0) - not > that Elisp has only one level, really, which is why you > should use `setq' there to avoid confusion and errors. > Because everyone can see what is created by `setq', this > should be visible in the code style as well. > > Note that just because it would seem that two functions > need access to the same variable, this actually doesn't > have to be the case at all! Think it thru one extra time > before you do it. Instructions like that belong on a website where they become easily searchable for other users to understand it. We could index all the mailing list easily and provide search engine for this.