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: How to create a higher order function? Date: Thu, 23 Sep 2021 01:50:47 +0200 Message-ID: <87ilysjhk8.fsf@zoho.eu> References: <87k0jawotx.fsf@mbork.pl> 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="38658"; 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:BuXFQUYo9A0mwro+ioU4IZGfRm4= Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane-mx.org@gnu.org Thu Sep 23 01:52:05 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 1mTC21-0009rQ-8d for geh-help-gnu-emacs@m.gmane-mx.org; Thu, 23 Sep 2021 01:52:05 +0200 Original-Received: from localhost ([::1]:42296 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1mTC1z-0003J8-GJ for geh-help-gnu-emacs@m.gmane-mx.org; Wed, 22 Sep 2021 19:52:03 -0400 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:48002) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1mTC0x-0003Im-ME for help-gnu-emacs@gnu.org; Wed, 22 Sep 2021 19:50:59 -0400 Original-Received: from ciao.gmane.io ([116.202.254.214]:42042) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1mTC0w-0000Df-1P for help-gnu-emacs@gnu.org; Wed, 22 Sep 2021 19:50:59 -0400 Original-Received: from list by ciao.gmane.io with local (Exim 4.92) (envelope-from ) id 1mTC0t-0008ND-RS for help-gnu-emacs@gnu.org; Thu, 23 Sep 2021 01:50:55 +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:133156 Archived-At: > (defun negate (fun) > "Return a function returning the logical opposite of FUN." > `(lambda (&rest args) > (not (apply ,(symbol-function fun) args)))) What does it really mean to be human? I mean a function? What makes one list a function and the other list just a list? That the list begins with certain words like `defun' or `lambda'. But then quoting that list - what does that mean - that makes the function-defining functions just data instead? Actually both defun and lambdas are Lisp macros ... -- underground experts united https://dataswamp.org/~incal