From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Emanuel Berg via Users list for the GNU Emacs text editor Newsgroups: gmane.emacs.help Subject: Re: Appending lists Date: Thu, 17 Jun 2021 01:39:27 +0200 Message-ID: <87fsxhs7kg.fsf@zoho.eu> 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> <87im2dvjgl.fsf@zoho.eu> <20210616184915.GA18839@tuxteam.de> Reply-To: Emanuel Berg Mime-Version: 1.0 Content-Type: text/plain Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="36477"; mail-complaints-to="usenet@ciao.gmane.io" User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/28.0.50 (gnu/linux) To: help-gnu-emacs@gnu.org Cancel-Lock: sha1:Mch0GaBg2v4zjWIGBQlHan5VJ6I= Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane-mx.org@gnu.org Thu Jun 17 01:40:59 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 1ltf9W-0009Gj-Di for geh-help-gnu-emacs@m.gmane-mx.org; Thu, 17 Jun 2021 01:40:58 +0200 Original-Received: from localhost ([::1]:59482 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1ltf9V-0008Kh-DQ for geh-help-gnu-emacs@m.gmane-mx.org; Wed, 16 Jun 2021 19:40:57 -0400 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:51566) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1ltf8g-0008KK-L1 for help-gnu-emacs@gnu.org; Wed, 16 Jun 2021 19:40:06 -0400 Original-Received: from ciao.gmane.io ([116.202.254.214]:38312) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1ltf8e-0004NX-M5 for help-gnu-emacs@gnu.org; Wed, 16 Jun 2021 19:40:06 -0400 Original-Received: from list by ciao.gmane.io with local (Exim 4.92) (envelope-from ) id 1ltf8c-00080y-I4 for help-gnu-emacs@gnu.org; Thu, 17 Jun 2021 01:40:02 +0200 X-Injected-Via-Gmane: http://gmane.org/ Mail-Followup-To: help-gnu-emacs@gnu.org Mail-Copies-To: never Received-SPF: pass client-ip=116.202.254.214; envelope-from=geh-help-gnu-emacs@m.gmane-mx.org; helo=ciao.gmane.io X-Spam_score_int: -16 X-Spam_score: -1.7 X-Spam_bar: - X-Spam_report: (-1.7 / 5.0 requ) BAYES_00=-1.9, HEADER_FROM_DIFFERENT_DOMAINS=0.249, SPF_HELO_NONE=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:130940 Archived-At: Jean Louis wrote: > It is exactly what I said, you talk about > underlying structures. > > It doesn't keep the variable's value constant as you said. It is the same value, the variable after its assignment (`setq') holds a reference to the first cons cell of the list, and after the evaluation of `nreverse' the variable holds a reference to the same cons cell, i.e. nothing has changed with respect to that variable, its value remains the same, untouched since the setq. > To put a point across it would be better to announce or make > a title that you don't talk how "variable never changes", > but you talk about the structures in memory and somewhat > interesting though practically within the spoken context > useless information. :O > What matters for programmer is that variable A instead of > holding value 1 now has value 2 Unheard of! Well, suffice to say, some programmers have pushed their level of ambition beyond what Super-Jean is trying to say - which is, tellingly perhaps, also incorrect :) -- underground experts united https://dataswamp.org/~incal