From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!not-for-mail From: Thorsten Jolitz Newsgroups: gmane.emacs.help Subject: 'length' function for lists and cons cells? Date: Thu, 21 Mar 2013 19:21:29 +0100 Message-ID: <87620k7gwm.fsf@gmail.com> NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: text/plain X-Trace: ger.gmane.org 1363890122 26952 80.91.229.3 (21 Mar 2013 18:22:02 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Thu, 21 Mar 2013 18:22:02 +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 Mar 21 19:22:27 2013 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 1UIk8A-0002JP-IS for geh-help-gnu-emacs@m.gmane.org; Thu, 21 Mar 2013 19:22:26 +0100 Original-Received: from localhost ([::1]:52220 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1UIk7n-0002C3-6x for geh-help-gnu-emacs@m.gmane.org; Thu, 21 Mar 2013 14:22:03 -0400 Original-Received: from eggs.gnu.org ([208.118.235.92]:34394) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1UIk7V-00027V-OP for help-gnu-emacs@gnu.org; Thu, 21 Mar 2013 14:21:48 -0400 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1UIk7U-0007fm-JC for help-gnu-emacs@gnu.org; Thu, 21 Mar 2013 14:21:45 -0400 Original-Received: from plane.gmane.org ([80.91.229.3]:47037) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1UIk7U-0007fd-9X for help-gnu-emacs@gnu.org; Thu, 21 Mar 2013 14:21:44 -0400 Original-Received: from list by plane.gmane.org with local (Exim 4.69) (envelope-from ) id 1UIk7o-00020r-JJ for help-gnu-emacs@gnu.org; Thu, 21 Mar 2013 19:22:04 +0100 Original-Received: from g231234180.adsl.alicedsl.de ([92.231.234.180]) by main.gmane.org with esmtp (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Thu, 21 Mar 2013 19:22:04 +0100 Original-Received: from tjolitz by g231234180.adsl.alicedsl.de with local (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Thu, 21 Mar 2013 19:22:04 +0100 X-Injected-Via-Gmane: http://gmane.org/ Original-Lines: 25 Original-X-Complaints-To: usenet@ger.gmane.org X-Gmane-NNTP-Posting-Host: g231234180.adsl.alicedsl.de User-Agent: Gnus/5.130002 (Ma Gnus v0.2) Emacs/24.2 (gnu/linux) Cancel-Lock: sha1:0ZfYqJ098RGLhepfmCMDuKSsVGY= X-detected-operating-system: by eggs.gnu.org: Genre and OS details not recognized. X-Received-From: 80.91.229.3 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:89637 Archived-At: Hi List, which function could I use when I map an alist e.g. with dolist, that contains both types of associations as shown below: cons cells, or lists with 3 or more elements? 'length' doesn't work on cons cells: ,------------------------ | (length '("a" "b" "c")) | 3 `------------------------ ,-------------------------------------------------------------- | (length '("a" . "c")) | | Debugger entered--Lisp error: (wrong-type-argument listp "c") | length(("a" . "c")) `-------------------------------------------------------------- -- cheers, Thorsten