From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: 2QdxY4RzWzUUiLuE@potatochowder.com Newsgroups: gmane.emacs.help Subject: Re: The function naming convention used by Emacs. Date: Sun, 26 Sep 2021 04:27:05 -0700 Message-ID: References: Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="12013"; mail-complaints-to="usenet@ciao.gmane.io" To: help-gnu-emacs@gnu.org Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane-mx.org@gnu.org Sun Sep 26 13:28:44 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 1mUSKq-0002tz-Dk for geh-help-gnu-emacs@m.gmane-mx.org; Sun, 26 Sep 2021 13:28:44 +0200 Original-Received: from localhost ([::1]:51024 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1mUSKo-0004We-Iz for geh-help-gnu-emacs@m.gmane-mx.org; Sun, 26 Sep 2021 07:28:42 -0400 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:39384) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from <2QdxY4RzWzUUiLuE@potatochowder.com>) id 1mUSJU-0004WH-FY for help-gnu-emacs@gnu.org; Sun, 26 Sep 2021 07:27:20 -0400 Original-Received: from www458.your-server.de ([136.243.165.62]:37348) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from <2QdxY4RzWzUUiLuE@potatochowder.com>) id 1mUSJS-0007JY-MO for help-gnu-emacs@gnu.org; Sun, 26 Sep 2021 07:27:20 -0400 Original-Received: from sslproxy02.your-server.de ([78.47.166.47]) by www458.your-server.de with esmtpsa (TLSv1.3:TLS_AES_256_GCM_SHA384:256) (Exim 4.92.3) (envelope-from <2QdxY4RzWzUUiLuE@potatochowder.com>) id 1mUSJM-000CsZ-84 for help-gnu-emacs@gnu.org; Sun, 26 Sep 2021 13:27:12 +0200 Original-Received: from [2607:fb90:fc5:480e:8978:1d31:85c:b5bc] (helo=localhost) by sslproxy02.your-server.de with esmtpsa (TLSv1.3:TLS_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from <2QdxY4RzWzUUiLuE@potatochowder.com>) id 1mUSJK-000Bhf-Lg for help-gnu-emacs@gnu.org; Sun, 26 Sep 2021 13:27:11 +0200 Mail-Followup-To: help-gnu-emacs@gnu.org Content-Disposition: inline In-Reply-To: X-Authenticated-Sender: 2QdxY4RzWzUUiLuE@potatochowder.com X-Virus-Scanned: Clear (ClamAV 0.103.3/26304/Sun Sep 26 11:02:43 2021) Received-SPF: pass client-ip=136.243.165.62; envelope-from=2QdxY4RzWzUUiLuE@potatochowder.com; helo=www458.your-server.de X-Spam_score_int: -18 X-Spam_score: -1.9 X-Spam_bar: - X-Spam_report: (-1.9 / 5.0 requ) BAYES_00=-1.9, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham 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:133253 Archived-At: On 2021-09-26 at 19:05:36 +0800, Hongyi Zhao wrote: > As far as function names are concerned, are there some established > conventions used by Emacs? For example, I noticed that there are so > many functions in Emacs named by the suffix `-p', say, > `file-exists-p', `ht-equal-p', and so on. But I still can't figure out > the meaning of this suffix. Any tips will be appreciated. The -p suffix is short for "predicate"; so file-exists-p is true if and only if the argument names and existing file. I learned of that convention from Common Lisp; I don't know the entire history.