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: [External] : Re: append, push, and add-to-list. Date: Mon, 05 Jul 2021 18:41:04 +0200 Message-ID: <87fswsg1cv.fsf@zoho.eu> References: <87o8bgg6br.fsf@zoho.eu> 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="32754"; 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:HxLbx4Vuj98ZZ7NnIbmsKI6z0iU= Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane-mx.org@gnu.org Mon Jul 05 18:41:58 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 1m0RfS-00089J-9Y for geh-help-gnu-emacs@m.gmane-mx.org; Mon, 05 Jul 2021 18:41:58 +0200 Original-Received: from localhost ([::1]:42422 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1m0RfR-0003ab-8z for geh-help-gnu-emacs@m.gmane-mx.org; Mon, 05 Jul 2021 12:41:57 -0400 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:48826) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1m0Rep-0003Wk-91 for help-gnu-emacs@gnu.org; Mon, 05 Jul 2021 12:41:19 -0400 Original-Received: from ciao.gmane.io ([116.202.254.214]:57914) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1m0Ren-0003TI-Nm for help-gnu-emacs@gnu.org; Mon, 05 Jul 2021 12:41:19 -0400 Original-Received: from list by ciao.gmane.io with local (Exim 4.92) (envelope-from ) id 1m0Rek-0007TU-Es for help-gnu-emacs@gnu.org; Mon, 05 Jul 2021 18:41:14 +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:131483 Archived-At: Drew Adams wrote: > To each their own. ;-) I don't find '() easier to spot than > (). It is easier to spot because it has an additional apostrophe (or apostrophe-quote) compared to (), that makes it more visibly and makes it stick out compared to all the (( and )) of `let', `cond', and more, and in general, from all the parenthesis of Lisp. >> But ... ultimately one writes code so the computer can >> execute it, and not so that a human can read it. So maybe >> one shouldn't quote empty lists? >> >> If so, I have 14 corrections to make... > > No, the computer couldn't care less whether > you write (list), nil, (), or '(). ;-) ... but you yourself said `list' is a function, nil is a constant (hm... didn't know we had those - (defun c-constant-symbol (sym len) "Create an uneditable symbol for customization buffers. SYM is the name of the symbol, LEN the length of the field (in characters) the symbol will be displayed in. LEN must be big enough. This returns a (const ....) structure, suitable for embedding within a customization type." (or (symbolp sym) (error "c-constant-symbol: %s is not a symbol" sym)) (let* ((name (symbol-name sym)) (l (length name)) (disp (concat name ":" (make-string (- len l 1) ?\ )))) `(const :size ,len :format ,disp :value ,sym)))) - perhaps that's something else since it seems to be just a list where the first element is const - but here, nil is unsuited for other reasons - and () is a constant (another, here more suited syntax, for nil), and '() is another syntax for (quote ()), which is `quote' a special form? Maybe the "special form" thing is that it doesn't eval the argument? (setf (quote ...) ...) Both list and quote are built-in, IOW written in C? -- underground experts united https://dataswamp.org/~incal