From: Barry Margolin <barmar@alum.mit.edu>
To: help-gnu-emacs@gnu.org
Subject: Re: How to mapcar or across a list?
Date: Wed, 15 Jul 2015 19:56:38 -0400 [thread overview]
Message-ID: <barmar-727F6E.19563815072015@88-209-239-213.giganet.hu> (raw)
In-Reply-To: mailman.6968.1436991281.904.help-gnu-emacs@gnu.org
In article <mailman.6968.1436991281.904.help-gnu-emacs@gnu.org>,
Marcin Borkowski <mbork@mbork.pl> 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 ***
next prev parent reply other threads:[~2015-07-15 23:56 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <mailman.6968.1436991281.904.help-gnu-emacs@gnu.org>
2015-07-15 20:45 ` How to mapcar or across a list? Pascal J. Bourguignon
2015-07-15 21:02 ` Marcin Borkowski
2015-07-15 23:56 ` Barry Margolin [this message]
2015-07-15 20:14 Marcin Borkowski
2015-07-15 20:42 ` Rasmus
2015-07-15 20:55 ` Marcin Borkowski
2015-07-15 22:21 ` Emanuel Berg
2015-07-15 22:21 ` John Mastro
[not found] ` <mailman.6977.1436998965.904.help-gnu-emacs@gnu.org>
2015-07-15 22:28 ` Pascal J. Bourguignon
2015-07-15 22:36 ` Emanuel Berg
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