From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Emanuel Berg Newsgroups: gmane.emacs.help Subject: Re: Closures - do you understand them well? Date: Fri, 09 Dec 2022 22:31:21 +0100 Message-ID: <877cz0uuvq.fsf@dataswamp.org> References: <87lenh7vrn.fsf@web.de> <87tu25d77o.fsf@gnu.org> <87h6y5pt8k.fsf@web.de> <87bkodpqnk.fsf@web.de> <87k030tlfh.fsf@web.de> <87ilike1l8.fsf@gnu.org> <87h6y4s27b.fsf@web.de> Mime-Version: 1.0 Content-Type: text/plain Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="24526"; mail-complaints-to="usenet@ciao.gmane.io" User-Agent: Gnus/5.13 (Gnus v5.13) To: help-gnu-emacs@gnu.org Cancel-Lock: sha1:gv8LwYWbkbQNQ1ncLsgw1AKIEXs= Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane-mx.org@gnu.org Sat Dec 10 11:08:45 2022 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 1p3wmj-0006AW-AA for geh-help-gnu-emacs@m.gmane-mx.org; Sat, 10 Dec 2022 11:08:45 +0100 Original-Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1p3wmS-0000dF-Tj; Sat, 10 Dec 2022 05:08:29 -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 1p3l1O-0000jA-54 for help-gnu-emacs@gnu.org; Fri, 09 Dec 2022 16:35:06 -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 1p3l1M-0007JE-7h for help-gnu-emacs@gnu.org; Fri, 09 Dec 2022 16:35:05 -0500 Original-Received: from list by ciao.gmane.io with local (Exim 4.92) (envelope-from ) id 1p3l1K-0004v1-KT for help-gnu-emacs@gnu.org; Fri, 09 Dec 2022 22:35:02 +0100 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-Mailman-Approved-At: Sat, 10 Dec 2022 05:08:27 -0500 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:141557 Archived-At: Michael Heerdegen wrote: >> (let ((i 0) >> (m (lambda (i) >> (lambda () i))) >> funs) >> (while (< i 100) >> (push (funcall m i) funs) >> (cl-incf i)) >> (mapcar #'funcall funs)) > > Yes, I think one can do this (the argument variable > i shadows the variable of the same in the `let', but it also > exists to conserve the value from the outside i so one can > argue that it's ok to use the same name - it's semantically > not incorrect anyway). Nice solution. Okay so now it works for me as well, maybe some encoding in messed up evaluation ... >> (let ((i 0) >> funs) >> (while (< i 100) >> (let ((j i)) >> (push (lambda () j) funs)) >> (cl-incf i)) >> (mapcar #'funcall funs)) > > This is the trick that is used in the implementation of > `dolist': create a binding that lives only inside the > evaluation of the body of the loop in one iteration step. Same, works. -- underground experts united https://dataswamp.org/~incal