From: Lennart Borgman <lennart.borgman@gmail.com>
To: Nordlöw <per.nordlow@gmail.com>
Cc: help-gnu-emacs@gnu.org
Subject: Re: Wanted: mapcar() without nils
Date: Sat, 13 Jun 2009 21:43:28 +0200 [thread overview]
Message-ID: <e01d8a50906131243w1af3c85cg4ab868f4d5dc1542@mail.gmail.com> (raw)
In-Reply-To: <65652541-cb7d-4c93-8baf-cd963990e57e@g1g2000yqh.googlegroups.com>
You misplaced a closing paren in the lambda
On Sat, Jun 13, 2009 at 8:24 PM, Nordlöw<per.nordlow@gmail.com> wrote:
> (defun extract-elements (pred seq)
> "Extract a copy of SEQ containing all elements fullfilling
> PRED."
> (delq nil (mapcar `(lambda (elm) (when (,pred elm)) elm) seq)))
(delq nil (mapcar `(lambda (elm) (when (,pred elm) elm)) seq)))
> ;; Use: (extract-elements 'symbolp '(a b 1 2)) => '(a b)
> ;; Use: (extract-elements 'numberp '(a b 1 2)) => '(1 2)
next prev parent reply other threads:[~2009-06-13 19:43 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-06-13 12:19 Wanted: mapcar() without nils Nordlöw
2009-06-13 12:47 ` Lennart Borgman
[not found] ` <mailman.562.1244897231.2239.help-gnu-emacs@gnu.org>
2009-06-13 18:24 ` Nordlöw
2009-06-13 19:05 ` Thierry Volpiatto
[not found] ` <mailman.581.1244920367.2239.help-gnu-emacs@gnu.org>
2009-06-13 19:33 ` Nordlöw
2009-06-13 19:45 ` Nordlöw
2009-06-13 19:43 ` Lennart Borgman [this message]
2009-06-13 20:02 ` Drew Adams
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