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: Appending lists Date: Wed, 16 Jun 2021 20:31:32 +0300 Message-ID: References: <87o8c8l32h.fsf@posteo.net> <87zgvs2bup.fsf@zoho.eu> <87y2bby1kr.fsf@zoho.eu> <20210615091834.GB24886@tuxteam.de> <87im2ewr3k.fsf@zoho.eu> <20210616072819.GB17919@tuxteam.de> <20210616115404.GD30658@tuxteam.de> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="11342"; mail-complaints-to="usenet@ciao.gmane.io" User-Agent: Mutt/2.0.7+183 (3d24855) (2021-05-28) Cc: help-gnu-emacs , Yuri Khan To: tomas@tuxteam.de Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane-mx.org@gnu.org Wed Jun 16 19:35:27 2021 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 1ltZRn-0002kG-8L for geh-help-gnu-emacs@m.gmane-mx.org; Wed, 16 Jun 2021 19:35:27 +0200 Original-Received: from localhost ([::1]:37630 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1ltZRm-0001k1-8M for geh-help-gnu-emacs@m.gmane-mx.org; Wed, 16 Jun 2021 13:35:26 -0400 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:56170) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1ltZRC-0001j0-IR for help-gnu-emacs@gnu.org; Wed, 16 Jun 2021 13:34:50 -0400 Original-Received: from stw1.rcdrun.com ([217.170.207.13]:60325) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1ltZRA-000880-QG for help-gnu-emacs@gnu.org; Wed, 16 Jun 2021 13:34:50 -0400 Original-Received: from localhost ([::ffff:197.157.0.23]) (AUTH: PLAIN admin, TLS: TLS1.3,256bits,ECDHE_RSA_AES_256_GCM_SHA384) by stw1.rcdrun.com with ESMTPSA id 0000000000076063.0000000060CA3616.0000577C; Wed, 16 Jun 2021 10:34:14 -0700 Mail-Followup-To: tomas@tuxteam.de, Yuri Khan , help-gnu-emacs Content-Disposition: inline In-Reply-To: <20210616115404.GD30658@tuxteam.de> Received-SPF: pass client-ip=217.170.207.13; envelope-from=bugs@gnu.support; helo=stw1.rcdrun.com X-Spam_score_int: -3 X-Spam_score: -0.4 X-Spam_bar: / X-Spam_report: (-0.4 / 5.0 requ) BAYES_00=-1.9, RCVD_IN_SORBS_WEB=1.5, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001 autolearn=no 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:130918 Archived-At: * tomas@tuxteam.de [2021-06-16 14:54]: > On Wed, Jun 16, 2021 at 02:30:51PM +0300, Jean Louis wrote: > > [...] > > > (setq list '(A B C)) ⇒ (A B C) > > (nconc list '(1 2 3)) ⇒ (A B C 1 2 3) > > list ⇒ (A B C 1 2 3) > > > > So maybe he was thinking that symbol `list' does not change, and I > > understood it that variable value does not change. > > > > Why not come back to that and explain me how the variable `list' did > > not change from (A B C) to (A B C 1 2 3)? > > Because the content of 'list' (wasn't it 'list1' last time we talked?) > is *not* the whole list. It is a reference to the list's head. > > What changed was the cdr of some cons cell downstream. The variable > doesn't see it. You speak of some hidden flows? How is that useful for programer in Emacs Lisp? Did variable's value change or not? -- Jean Take action in Free Software Foundation campaigns: https://www.fsf.org/campaigns In support of Richard M. Stallman https://stallmansupport.org/