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: cl-loop - do you understand it well? Date: Sun, 18 Dec 2022 01:16:30 +0100 Message-ID: <874jtt36sh.fsf@web.de> References: <87zgbwyp46.fsf@dataswamp.org> <87k02zkrzw.fsf@web.de> <87wn6zhyna.fsf@disroot.org> <877cyzyogm.fsf@web.de> <87r0x6iisg.fsf@disroot.org> <87bko9o0tm.fsf@web.de> <87tu1xr182.fsf@dataswamp.org> <87bko4m6ej.fsf@web.de> <871qoyoq0u.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="25600"; mail-complaints-to="usenet@ciao.gmane.io" User-Agent: Gnus/5.13 (Gnus v5.13) To: help-gnu-emacs@gnu.org Cancel-Lock: sha1:PNJQBR82WkZ9ZbXgGgMDR5S7Y/4= Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane-mx.org@gnu.org Sun Dec 18 01:20:38 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 1p6hPy-0006Tr-Az for geh-help-gnu-emacs@m.gmane-mx.org; Sun, 18 Dec 2022 01:20:38 +0100 Original-Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1p6hPZ-0004fw-0F; Sat, 17 Dec 2022 19:20:13 -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 1p6hPV-0004fi-K3 for help-gnu-emacs@gnu.org; Sat, 17 Dec 2022 19:20:10 -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 1p6hPQ-0003cO-7J for help-gnu-emacs@gnu.org; Sat, 17 Dec 2022 19:20:09 -0500 Original-Received: from list by ciao.gmane.io with local (Exim 4.92) (envelope-from ) id 1p6hPO-0005oj-Bm for help-gnu-emacs@gnu.org; Sun, 18 Dec 2022 01:20:02 +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: -15 X-Spam_score: -1.6 X-Spam_bar: - X-Spam_report: (-1.6 / 5.0 requ) BAYES_00=-1.9, FREEMAIL_FORGED_FROMDOMAIN=0.001, FREEMAIL_FROM=0.001, 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: 2.1.29 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:141843 Archived-At: Emanuel Berg writes: > >> Jokes that I don't understand aside, why does this return 4? > >> > >> (require 'cl-lib) > >> > >> (cl-loop > >> for i from 0 to 1 > >> collect (lambda () i) into funs > >> finally return (apply #'+ (mapcar #'funcall funs)) ) > > > > Because of internal implementation details? > > I don't think so, rather it has something to do with how > `cl-loop' is programmed. This was a joke, right? Anyway, #+begin_src emacs-lisp (macroexpand-1 '(cl-loop for i from 0 to 1 collect (lambda () i) into funs finally return (apply #'+ (mapcar #'funcall funs)))) ==> (cl-block nil (let* ((i 0) (funs nil)) (while (<= i 1) (setq funs (nconc funs (list (lambda nil i)))) (setq i (+ i 1))) (apply #'+ (mapcar #'funcall funs)))) #+end_src Nearly the same code as we had discussed. But I guess this was all clear to you (or not?). Michael.