From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.ciao.gmane.io!not-for-mail From: Tim Johnson Newsgroups: gmane.emacs.help Subject: Proper use of function form Date: Sun, 26 Apr 2020 15:27:15 -0800 Message-ID: Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 8bit Injection-Info: ciao.gmane.io; posting-host="ciao.gmane.io:159.69.161.202"; logging-data="83826"; mail-complaints-to="usenet@ciao.gmane.io" User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.9.1 To: MLEmacs Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane-mx.org@gnu.org Mon Apr 27 01:27:56 2020 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 1jSqgm-000LiC-Gy for geh-help-gnu-emacs@m.gmane-mx.org; Mon, 27 Apr 2020 01:27:56 +0200 Original-Received: from localhost ([::1]:48724 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1jSqgl-0002kn-Fm for geh-help-gnu-emacs@m.gmane-mx.org; Sun, 26 Apr 2020 19:27:55 -0400 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:46180) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1jSqgN-0002kJ-Sl for help-gnu-emacs@gnu.org; Sun, 26 Apr 2020 19:27:32 -0400 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.90_1) (envelope-from ) id 1jSqgM-0006Mc-Ql for help-gnu-emacs@gnu.org; Sun, 26 Apr 2020 19:27:31 -0400 Original-Received: from gateway22.websitewelcome.com ([192.185.46.224]:32776) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1jSqgM-0006FM-5q for help-gnu-emacs@gnu.org; Sun, 26 Apr 2020 19:27:30 -0400 Original-Received: from cm17.websitewelcome.com (cm17.websitewelcome.com [100.42.49.20]) by gateway22.websitewelcome.com (Postfix) with ESMTP id 54F4BBEAE for ; Sun, 26 Apr 2020 18:27:17 -0500 (CDT) Original-Received: from host2075.hostmonster.com ([67.20.113.97]) by cmsmtp with SMTP id Sqg8jOXt5AGTXSqg9jhY6K; Sun, 26 Apr 2020 18:27:17 -0500 X-Authority-Reason: nr=8 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=tj49.com; s=default; h=Content-Type:MIME-Version:Date:Message-ID:Subject:From:To: Sender:Reply-To:Cc:Content-Transfer-Encoding:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: In-Reply-To:References:List-Id:List-Help:List-Unsubscribe:List-Subscribe: List-Post:List-Owner:List-Archive; bh=7Y02eToo65E0LXB/5s43rE0uFOP7aiw1oMVSGrH+fy0=; b=WbXPSr50NQ6f/NVcXy+IslFMAv dMZEMexdn18XFchZFtHtTD1lX+FLUCQSFBZRQHyrMtiyPzY8gzO2K2C2f4sEmkw1g1JyStj30ajBe +2GpuWURPuSfip0smJDvwb9mt; Original-Received: from tjohnson.mtaonline.net ([64.4.232.191]:41428 helo=[192.168.1.6]) by host2075.hostmonster.com with esmtpsa (TLSv1.2:ECDHE-RSA-AES128-GCM-SHA256:128) (Exim 4.92) (envelope-from ) id 1jSqg8-002C1a-OC for Help-gnu-emacs@gnu.org; Sun, 26 Apr 2020 17:27:16 -0600 Content-Language: en-US X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - host2075.hostmonster.com X-AntiAbuse: Original Domain - gnu.org X-AntiAbuse: Originator/Caller UID/GID - [47 12] / [47 12] X-AntiAbuse: Sender Address Domain - akwebsoft.com X-BWhitelist: no X-Source-IP: 64.4.232.191 X-Source-L: No X-Exim-ID: 1jSqg8-002C1a-OC X-Source-Sender: tjohnson.mtaonline.net ([192.168.1.6]) [64.4.232.191]:41428 X-Source-Auth: tim@tj49.com X-Email-Count: 1 X-Source-Cap: bW9sZG92YXM7bW9sZG92YXM7aG9zdDIwNzUuaG9zdG1vbnN0ZXIuY29t X-Local-Domain: yes Received-SPF: neutral client-ip=192.185.46.224; envelope-from=tim@akwebsoft.com; helo=gateway22.websitewelcome.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/04/26 19:27:17 X-ACL-Warn: Detected OS = Linux 2.2.x-3.x [generic] X-Received-From: 192.185.46.224 X-Content-Filtered-By: Mailman/MimeDel 2.1.23 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:122946 Archived-At: Here is a key definition: (define-key jinja2-mode-map (kbd "C-c i") #'jinja2-insert-var) As I understand it, the sharp-quote (#') tells the compiler that jinja2-insert-var is meant to be a function The following quotation: "it is always good practice to sharp quote every symbol that is the name of a function, whether it's going into a |mapcar|, an |apply|, a |funcall|, or anything else." Can be found at https://endlessparentheses.com/get-in-the-habit-of-using-sharp-quote.html fuurther text there describes the special 'function form for which the sharp-quote is a shorthand. Suppose we are processing a sexp of alternating strings and symbols: (setq my-keypairs '("h" my-h-func "g" my-g-func "f" my-f-func)) and using iteration to *programmatically* call define-key for multiple key definitions as in (define-key mymap                               ;; add to keymap     (kbd (concat ldr (nth ndx mylist)))    ;; sequence as in "g"     (nth (+ ndx 1) mylist))                      ;; command as in my-g-func The form above is indeed a snippet from a defun that I have used for years Would it be better to change (nth (+ ndx 1) mylist) to (function (nth (+ ndx 1) mylist)) ? I note that help for 'function states a preference for using it with function objects, but says nothing about processing a list. Hence I am lobbying wiser heads than mine for opinions before I implement something that might cause subtle problems down the road. Emacs is GNU Emacs 26.3 (build 2, x86_64-pc-linux-gnu, X toolkit, Xaw scroll bars) on ubuntu 16.04 Thanks -- f Tim tj49.com