From: David Hansen <david.hansen@gmx.net>
To: help-gnu-emacs@gnu.org
Subject: Re: sorting a list
Date: Thu, 17 Apr 2008 08:34:36 +0200 [thread overview]
Message-ID: <87fxtlgfb7.fsf@localhorst.mine.nu> (raw)
In-Reply-To: loom.20080417T061701-911@post.gmane.org
On Thu, 17 Apr 2008 06:18:39 +0000 (UTC) Seweryn Kokot wrote:
> Assume I have a list
>
> '(("abc" "xxsx")
> ("zdfa" "xxsx")
> ("dddbc" "xxsx")
> ("cabc" "xxsx"))
>
> How to sort the list according to the first element in the lists so to
> get
>
> '(("abc" "xxsx")
> ("cabc" "xxsx")
> ("dddbc" "xxsx")
> ("zdfa" "xxsx"))
>
(sort '(("abc" "xxsx")
("zdfa" "xxsx")
("dddbc" "xxsx")
("cabc" "xxsx"))
#'(lambda (list1 list2)
(string< (car list1) (car list2))))
(("abc" "xxsx") ("cabc" "xxsx") ("dddbc" "xxsx") ("zdfa" "xxsx"))
or if you like the cl equivalent more:
(sort* '(("abc" "xxsx")
("zdfa" "xxsx")
("dddbc" "xxsx")
("cabc" "xxsx"))
#'string<
:key #'car)
(("abc" "xxsx") ("cabc" "xxsx") ("dddbc" "xxsx") ("zdfa" "xxsx"))
next prev parent reply other threads:[~2008-04-17 6:34 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-04-17 6:18 sorting a list Seweryn Kokot
2008-04-17 6:34 ` David Hansen [this message]
[not found] <mailman.10469.1208413210.18990.help-gnu-emacs@gnu.org>
2008-04-17 18:09 ` Pascal Bourguignon
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