From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!not-for-mail From: Barry Margolin Newsgroups: gmane.emacs.help Subject: Re: How to mapcar or across a list? Date: Wed, 15 Jul 2015 19:56:38 -0400 Organization: A noiseless patient Spider Message-ID: References: NNTP-Posting-Host: plane.gmane.org X-Trace: ger.gmane.org 1437004820 12555 80.91.229.3 (16 Jul 2015 00:00:20 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Thu, 16 Jul 2015 00:00:20 +0000 (UTC) To: help-gnu-emacs@gnu.org Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane.org@gnu.org Thu Jul 16 02:00:18 2015 Return-path: Envelope-to: geh-help-gnu-emacs@m.gmane.org Original-Received: from lists.gnu.org ([208.118.235.17]) by plane.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1ZFWb3-00016w-O9 for geh-help-gnu-emacs@m.gmane.org; Thu, 16 Jul 2015 02:00:17 +0200 Original-Received: from localhost ([::1]:37860 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ZFWb3-0006PN-5o for geh-help-gnu-emacs@m.gmane.org; Wed, 15 Jul 2015 20:00:17 -0400 Original-Path: usenet.stanford.edu!news.kjsl.com!feeder.erje.net!1.eu.feeder.erje.net!newsfeed.fsmpi.rwth-aachen.de!newsfeed.straub-nv.de!eternal-september.org!feeder.eternal-september.org!mx02.eternal-september.org!barmar.motzarella.org!.POSTED!not-for-mail Original-Newsgroups: gnu.emacs.help Original-Lines: 18 Injection-Info: barmar.motzarella.org; posting-host="2be9e9f5dd9af768b8861af71b85fc28"; logging-data="26060"; mail-complaints-to="abuse@eternal-september.org"; posting-account="U2FsdGVkX18jHfUQcwJqqDsskIOoe61g" User-Agent: MT-NewsWatcher/3.5.3b3 (Intel Mac OS X) Cancel-Lock: sha1:maoNfBvq9FhbKKmWdQYYurHtk8w= Original-Xref: usenet.stanford.edu gnu.emacs.help:213465 X-BeenThere: help-gnu-emacs@gnu.org X-Mailman-Version: 2.1.14 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.org@gnu.org Original-Sender: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane.org@gnu.org Xref: news.gmane.org gmane.emacs.help:105752 Archived-At: In article , Marcin Borkowski wrote: > Hi there, > > so here's my problem: I have a list of Boolean values, and I want to > `mapcar' an `or' across it (IOW, I want to test whether at least one of > them is true). Of course, (apply #'or my-list) does not work. Of > course, I can (cl-reduce (lambda (x y) (or x y)) my-list) -- but is > there a better method? "mapcar" is not the right metaphor. It's for running the same function separately on each element of a list, not for combining elements. -- Barry Margolin, barmar@alum.mit.edu Arlington, MA *** PLEASE post questions in newsgroups, not directly to me ***