From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Stefan Monnier Newsgroups: gmane.emacs.help Subject: Re: How to get plist properties list? Date: Sat, 09 Jan 2021 11:57:45 -0500 Message-ID: References: <7eec4142-3c37-4084-9ea1-73df5df2c821@default> Mime-Version: 1.0 Content-Type: text/plain Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="21281"; 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:VNXs5CtzRV/eZI4L1j46CcyDX84= Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane-mx.org@gnu.org Sat Jan 09 18:03:10 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 1kyHds-0005P1-Aq for geh-help-gnu-emacs@m.gmane-mx.org; Sat, 09 Jan 2021 18:03:08 +0100 Original-Received: from localhost ([::1]:56450 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1kyHdr-0006xT-BT for geh-help-gnu-emacs@m.gmane-mx.org; Sat, 09 Jan 2021 12:03:07 -0500 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:37318) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1kyHaw-0002yb-Dm for help-gnu-emacs@gnu.org; Sat, 09 Jan 2021 12:00:06 -0500 Original-Received: from ciao.gmane.io ([116.202.254.214]:55770) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1kyHau-0000hB-R8 for help-gnu-emacs@gnu.org; Sat, 09 Jan 2021 12:00:06 -0500 Original-Received: from list by ciao.gmane.io with local (Exim 4.92) (envelope-from ) id 1kyHas-0002BZ-Ai for help-gnu-emacs@gnu.org; Sat, 09 Jan 2021 18:00:02 +0100 X-Injected-Via-Gmane: http://gmane.org/ 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: -15 X-Spam_score: -1.6 X-Spam_bar: - X-Spam_report: (-1.6 / 5.0 requ) BAYES_00=-1.9, HEADER_FROM_DIFFERENT_DOMAINS=0.25, 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:127136 Archived-At: > If I wish to get the element like number 17th I do not know what I If you need that, it's "too late" to do something else. The question is "if I wish to do something over all (or most of) the elements of a list". And for that the answer is "don't use dotimes + nth" but use `dolist` or `mapcar` or `while + cdr`. Needing the N'th element of a list is actually rare (just like it's rare to need to go to kilometer N of a road compared to the frequency of having to walk along that road doing this along its way). Stefan