From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!not-for-mail From: "Drew Adams" Newsgroups: gmane.emacs.help Subject: RE: Wanted: Adding list-elements into an existing list Date: Thu, 16 Oct 2008 08:43:48 -0700 Message-ID: <002c01c92fa5$fba25940$c2b22382@us.oracle.com> References: <874p3cvfwy.fsf@zeekat.nl> NNTP-Posting-Host: lo.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit X-Trace: ger.gmane.org 1224171873 12262 80.91.229.12 (16 Oct 2008 15:44:33 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Thu, 16 Oct 2008 15:44:33 +0000 (UTC) To: "=?iso-8859-1?Q?'Nordl=F6w'?=" , Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane.org@gnu.org Thu Oct 16 17:45:30 2008 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 1KqV2X-0006Ny-7M for geh-help-gnu-emacs@m.gmane.org; Thu, 16 Oct 2008 17:45:29 +0200 Original-Received: from localhost ([127.0.0.1]:56336 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1KqV1S-0004Bw-FN for geh-help-gnu-emacs@m.gmane.org; Thu, 16 Oct 2008 11:44:22 -0400 Original-Received: from mailman by lists.gnu.org with tmda-scanned (Exim 4.43) id 1KqV15-0004A6-N0 for help-gnu-emacs@gnu.org; Thu, 16 Oct 2008 11:43:59 -0400 Original-Received: from exim by lists.gnu.org with spam-scanned (Exim 4.43) id 1KqV13-00045B-SW for help-gnu-emacs@gnu.org; Thu, 16 Oct 2008 11:43:58 -0400 Original-Received: from [199.232.76.173] (port=48134 helo=monty-python.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1KqV13-000454-Lw for help-gnu-emacs@gnu.org; Thu, 16 Oct 2008 11:43:57 -0400 Original-Received: from agminet01.oracle.com ([141.146.126.228]:25657) by monty-python.gnu.org with esmtps (TLS-1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.60) (envelope-from ) id 1KqV13-0003S6-9N for help-gnu-emacs@gnu.org; Thu, 16 Oct 2008 11:43:57 -0400 Original-Received: from agmgw2.us.oracle.com (agmgw2.us.oracle.com [152.68.180.213]) by agminet01.oracle.com (Switch-3.2.4/Switch-3.1.7) with ESMTP id m9GFhnhu020834; Thu, 16 Oct 2008 10:43:49 -0500 Original-Received: from acsmt703.oracle.com (acsmt703.oracle.com [141.146.40.81]) by agmgw2.us.oracle.com (Switch-3.2.0/Switch-3.2.0) with ESMTP id m9GFhmJv002213; Thu, 16 Oct 2008 09:43:48 -0600 Original-Received: from dradamslap1 (/130.35.178.194) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Thu, 16 Oct 2008 08:43:47 -0700 X-Mailer: Microsoft Office Outlook 11 In-Reply-To: thread-index: AckvlTOn4S2jCM4nQImxqPb6fKSPTgAEBi0A X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.3350 X-Brightmail-Tracker: AAAAAQAAAAI= X-Brightmail-Tracker: AAAAAQAAAAI= X-Whitelist: TRUE X-Whitelist: TRUE X-detected-operating-system: by monty-python.gnu.org: GNU/Linux 2.4-2.6 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:58845 Archived-At: > (append) does not modify its first argument which is what I want. > I can solve it through (setq x (append x y)) Depends what you want. You mentioned `add-to-list', which adds an element only if it is not already there. Neither `append' nor `nconc' does that for combining lists. Sounds more like you want something like set intersection: see functions `intersection' or `nintersection' in library `cl-seq.el'.