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: Closures - do you understand them well? Date: Sun, 11 Dec 2022 03:24:06 +0100 Message-ID: <87fsdmy8xl.fsf@web.de> References: <87lenh7vrn.fsf@web.de> <87tu25d77o.fsf@gnu.org> <87h6y5pt8k.fsf@web.de> <87bkodpqnk.fsf@web.de> <87k030tlfh.fsf@web.de> <87ilikxgkd.fsf@web.de> <87y1rf1txv.fsf@gnu.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="2846"; mail-complaints-to="usenet@ciao.gmane.io" User-Agent: Gnus/5.13 (Gnus v5.13) To: help-gnu-emacs@gnu.org Cancel-Lock: sha1:xboNutWpDbqp8bo9nP/QXdQi3mk= Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane-mx.org@gnu.org Sun Dec 11 03:24:40 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 1p4C1A-0000ZF-IN for geh-help-gnu-emacs@m.gmane-mx.org; Sun, 11 Dec 2022 03:24:40 +0100 Original-Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1p4C0p-000442-Rg; Sat, 10 Dec 2022 21:24:19 -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 1p4C0o-00043q-3b for help-gnu-emacs@gnu.org; Sat, 10 Dec 2022 21:24:18 -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 1p4C0m-00081d-IX for help-gnu-emacs@gnu.org; Sat, 10 Dec 2022 21:24:17 -0500 Original-Received: from list by ciao.gmane.io with local (Exim 4.92) (envelope-from ) id 1p4C0j-000AbV-Oh for help-gnu-emacs@gnu.org; Sun, 11 Dec 2022 03:24:13 +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=0.249, 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:141618 Archived-At: Tassilo Horn writes: > > Would this be a valid solution? > > > > #+begin_src emacs-lisp > > (let ((i 0) (funs)) > > (while (<= (cl-incf i) 100) > > (push (apply-partially #'identity i) funs)) > > (nreverse funs)) > > #+end_src > > Apparently it works although I don't see why. I do think the above is a valid solution. > Where's the difference to > this inlined version which returns (101 ... 101)? > > (let ((i 0) (funs)) > (while (<= (cl-incf i) 100) > (push (lambda (&rest args2) > (apply #'identity (append (list i) args2))) > funs)) > (mapcar #'funcall (nreverse funs))) Well - `apply-partially' is a function and I use a simple function call, so it is precisely not just something inlined: The important point is that only the _value_ of the variable i passed, not the variable or a reference to it: #+begin_src emacs-lisp (let ((i 27)) (apply-partially #'identity i)) ==> (closure ((args . (27)) (fun . identity)) (&rest args2) (apply fun (append args args2))) #+end_src Michael.