From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!not-for-mail From: =?ISO-8859-1?Q?Nordl=F6w?= Newsgroups: gmane.emacs.help Subject: Adding many elements to a list Date: Fri, 18 Sep 2009 06:15:54 -0700 (PDT) Organization: http://groups.google.com Message-ID: <979e809f-0b95-46bf-afa4-1a25cda5bae0@j9g2000vbp.googlegroups.com> NNTP-Posting-Host: lo.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable X-Trace: ger.gmane.org 1253282300 2277 80.91.229.12 (18 Sep 2009 13:58:20 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Fri, 18 Sep 2009 13:58:20 +0000 (UTC) To: help-gnu-emacs@gnu.org Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane.org@gnu.org Fri Sep 18 15:58:13 2009 Return-path: Envelope-to: geh-help-gnu-emacs@m.gmane.org Original-Received: from lists.gnu.org ([199.232.76.165]) by lo.gmane.org with esmtp (Exim 4.50) id 1ModyW-0003G6-SN for geh-help-gnu-emacs@m.gmane.org; Fri, 18 Sep 2009 15:58:13 +0200 Original-Received: from localhost ([127.0.0.1]:51975 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1ModyW-0001jZ-DH for geh-help-gnu-emacs@m.gmane.org; Fri, 18 Sep 2009 09:58:12 -0400 Original-Path: news.stanford.edu!usenet.stanford.edu!newsfeed.news2me.com!news.glorb.com!news2.glorb.com!postnews.google.com!j9g2000vbp.googlegroups.com!not-for-mail Original-Newsgroups: gnu.emacs.help Original-Lines: 21 Original-NNTP-Posting-Host: 150.227.15.253 Original-X-Trace: posting.google.com 1253279754 32361 127.0.0.1 (18 Sep 2009 13:15:54 GMT) Original-X-Complaints-To: groups-abuse@google.com Original-NNTP-Posting-Date: Fri, 18 Sep 2009 13:15:54 +0000 (UTC) Complaints-To: groups-abuse@google.com Injection-Info: j9g2000vbp.googlegroups.com; posting-host=150.227.15.253; posting-account=ytJKAgoAAAA1tg4ScoRszebXiIldA5vg User-Agent: G2/1.0 X-HTTP-Via: 1.1 ip1-w.foi.se:8080 (IronPort-WSA/6.3.0-523) X-HTTP-UserAgent: Mozilla/5.0 (X11; U; Linux i686; en-US) AppleWebKit/532.0 (KHTML, like Gecko) Chrome/4.0.212.0 Safari/532.0,gzip(gfe),gzip(gfe) Original-Xref: news.stanford.edu gnu.emacs.help:173146 X-BeenThere: help-gnu-emacs@gnu.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Users list for the GNU Emacs text editor List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Original-Sender: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane.org@gnu.org Errors-To: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane.org@gnu.org Xref: news.gmane.org gmane.emacs.help:68269 Archived-At: What is the most efficient way of performing lots of successive appends of elements to the same list? If we start with defining the list (setq l '(a b)) then the Emacs manual says that we can use (nconc l '(c d))) I have noticed that this works in all cases except when l is nil. To make this case work aswell we need to do use (setq l (nconc l '(c d)))) Or can we use setcar or setcdr in a more clever way? Reflections? Per Nordl=F6w