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 20:36:00 +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> <87im2eufop.fsf@posteo.net> 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="33644"; 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: Philip Kaludercic Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane-mx.org@gnu.org Wed Jun 16 19:39:46 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 1ltZVx-0008c1-QJ for geh-help-gnu-emacs@m.gmane-mx.org; Wed, 16 Jun 2021 19:39:45 +0200 Original-Received: from localhost ([::1]:42898 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1ltZVw-0005WK-KK for geh-help-gnu-emacs@m.gmane-mx.org; Wed, 16 Jun 2021 13:39:44 -0400 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:56890) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1ltZVS-0005VQ-RT for help-gnu-emacs@gnu.org; Wed, 16 Jun 2021 13:39:15 -0400 Original-Received: from stw1.rcdrun.com ([217.170.207.13]:57703) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1ltZVQ-0002wo-VJ for help-gnu-emacs@gnu.org; Wed, 16 Jun 2021 13:39:14 -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 0000000000076063.0000000060CA373D.00005867; Wed, 16 Jun 2021 10:39:09 -0700 Mail-Followup-To: Philip Kaludercic , Yuri Khan , help-gnu-emacs Content-Disposition: inline In-Reply-To: <87im2eufop.fsf@posteo.net> 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:130919 Archived-At: * Philip Kaludercic [2021-06-16 16:07]: > > (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) > > Change that to > (let* ((list-1 '(a b c)) (list-2 (nconc list-1 '(1 2 3)))) (eq list-1 list-2)) ;; => t eq - Return t if the two args are the same Lisp object. And we talked how variable's value does not change... values or Lisp objects? (setq list-1 '(a b c)) list-1 ⇒ (a b c) (setq list-2 (nconc list-1 '(1 2 3))) ⇒ (a b c 1 2 3) list-2 ⇒ (a b c 1 2 3) (eq list-1 list-2) ⇒ t list-1 ⇒ (a b c 1 2 3) How I see that is that it is same lisp object, but I can visually see that the value changed. Maybe Thomas wanted to say that lisp object does not change? -- Jean Take action in Free Software Foundation campaigns: https://www.fsf.org/campaigns In support of Richard M. Stallman https://stallmansupport.org/