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: The function naming convention used by Emacs. Date: Sun, 26 Sep 2021 13:49:48 +0200 Message-ID: <87o88ftv37.fsf@zoho.eu> References: 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="36481"; 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:OOPIe/O3mwxPG2YqESg2kBc95Mk= Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane-mx.org@gnu.org Sun Sep 26 13:51:17 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 1mUSgf-0009Ku-By for geh-help-gnu-emacs@m.gmane-mx.org; Sun, 26 Sep 2021 13:51:17 +0200 Original-Received: from localhost ([::1]:36220 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1mUSge-0007Ly-5o for geh-help-gnu-emacs@m.gmane-mx.org; Sun, 26 Sep 2021 07:51:16 -0400 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:42404) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1mUSfV-0007Ie-7k for help-gnu-emacs@gnu.org; Sun, 26 Sep 2021 07:50:05 -0400 Original-Received: from ciao.gmane.io ([116.202.254.214]:36312) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1mUSfT-00067V-Ri for help-gnu-emacs@gnu.org; Sun, 26 Sep 2021 07:50:05 -0400 Original-Received: from list by ciao.gmane.io with local (Exim 4.92) (envelope-from ) id 1mUSfS-0007xp-A3 for help-gnu-emacs@gnu.org; Sun, 26 Sep 2021 13:50:02 +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: -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:133256 Archived-At: 2QdxY4RzWzUUiLuE 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. Me neither :) But it is from Predicate Logic which is an extension of Propositional Logic ... -- underground experts united https://dataswamp.org/~incal