From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Michael Heerdegen Newsgroups: gmane.emacs.help Subject: Re: Another question about lambdas Date: Thu, 19 Jan 2023 14:32:24 +0100 Message-ID: <87zgae8xav.fsf@web.de> References: <87tu23kw9x.fsf@web.de> <861qp67wgm.fsf@gnu.org> <87wn6yyflc.fsf@web.de> <871qp5o05o.fsf@web.de> <87a62gyt4o.fsf@dataswamp.org> Mime-Version: 1.0 Content-Type: text/plain Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="3191"; mail-complaints-to="usenet@ciao.gmane.io" User-Agent: Gnus/5.13 (Gnus v5.13) To: help-gnu-emacs@gnu.org Cancel-Lock: sha1:3NwaNyKZkA6wleRPtWpngfTozeQ= Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane-mx.org@gnu.org Thu Jan 19 14:36:03 2023 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 1pIV5H-0000Vx-6l for geh-help-gnu-emacs@m.gmane-mx.org; Thu, 19 Jan 2023 14:36:03 +0100 Original-Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1pIV4r-0004TQ-GD; Thu, 19 Jan 2023 08:35:39 -0500 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1pIV4P-0004DT-35 for help-gnu-emacs@gnu.org; Thu, 19 Jan 2023 08:35:10 -0500 Original-Received: from ciao.gmane.io ([116.202.254.214]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1pIV4M-0001Ev-CQ for help-gnu-emacs@gnu.org; Thu, 19 Jan 2023 08:35:08 -0500 Original-Received: from list by ciao.gmane.io with local (Exim 4.92) (envelope-from ) id 1pIV4I-0009VA-7q for help-gnu-emacs@gnu.org; Thu, 19 Jan 2023 14:35:02 +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: -13 X-Spam_score: -1.4 X-Spam_bar: - X-Spam_report: (-1.4 / 5.0 requ) BAYES_00=-1.9, FREEMAIL_FORGED_FROMDOMAIN=0.25, FREEMAIL_FROM=0.001, 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: 2.1.29 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-bounces+geh-help-gnu-emacs=m.gmane-mx.org@gnu.org Xref: news.gmane.io gmane.emacs.help:142417 Archived-At: Emanuel Berg writes: > I mean, why do we have all this f(x) and g() { x } notation in > programming if it is, or can be, actually the same x as some > x outside of that? Just looking at it, and writing it, tells > me, "hey, this is an x of it's own". But with dynamic scope it > sometimes isn't and you have to look somewhere else, execute > code in your head etc to find out. > [...] > > > And a lot have their problems with lexical binding > > and closures. > > What do you mean, what's up with them? As long as there are only individual closures that only treat one individual variable it's all trivial, yes. The non-trivial aspects start when several closures, used in different parts of a program, share the same variables of the same environment, or partly share an environment partly. Or a variable of the same name appears multiple times in different environments with different bindings. The "execute code in your head" thing is a question of code complexity, not one of scoping. Michael.