From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!not-for-mail From: Kevin Rodgers Newsgroups: gmane.emacs.help Subject: best way to get the list of unique keys from 2 alists Date: Fri, 16 Dec 2005 10:47:53 -0700 Message-ID: NNTP-Posting-Host: main.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-Trace: sea.gmane.org 1134766741 4048 80.91.229.2 (16 Dec 2005 20:59:01 GMT) X-Complaints-To: usenet@sea.gmane.org NNTP-Posting-Date: Fri, 16 Dec 2005 20:59:01 +0000 (UTC) Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane.org@gnu.org Fri Dec 16 21:58:52 2005 Return-path: Original-Received: from lists.gnu.org ([199.232.76.165]) by ciao.gmane.org with esmtp (Exim 4.43) id 1EnMdS-0002Vw-34 for geh-help-gnu-emacs@m.gmane.org; Fri, 16 Dec 2005 21:57:02 +0100 Original-Received: from localhost ([127.0.0.1] helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1EnMeA-0000x8-1N for geh-help-gnu-emacs@m.gmane.org; Fri, 16 Dec 2005 15:57:46 -0500 Original-Received: from mailman by lists.gnu.org with tmda-scanned (Exim 4.43) id 1EnJl6-0008Hf-Q5 for help-gnu-emacs@gnu.org; Fri, 16 Dec 2005 12:52:45 -0500 Original-Received: from exim by lists.gnu.org with spam-scanned (Exim 4.43) id 1EnJl1-0008Gy-PV for help-gnu-emacs@gnu.org; Fri, 16 Dec 2005 12:52:42 -0500 Original-Received: from [199.232.76.173] (helo=monty-python.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1EnJkw-0008GR-7X for help-gnu-emacs@gnu.org; Fri, 16 Dec 2005 12:52:37 -0500 Original-Received: from [80.91.229.2] (helo=ciao.gmane.org) by monty-python.gnu.org with esmtp (TLS-1.0:RSA_AES_128_CBC_SHA:16) (Exim 4.34) id 1EnJnO-0003JA-E5 for help-gnu-emacs@gnu.org; Fri, 16 Dec 2005 12:55:06 -0500 Original-Received: from list by ciao.gmane.org with local (Exim 4.43) id 1EnJic-00047t-RD for help-gnu-emacs@gnu.org; Fri, 16 Dec 2005 18:50:11 +0100 Original-Received: from 207.167.42.60 ([207.167.42.60]) by main.gmane.org with esmtp (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Fri, 16 Dec 2005 18:50:10 +0100 Original-Received: from ihs_4664 by 207.167.42.60 with local (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Fri, 16 Dec 2005 18:50:10 +0100 X-Injected-Via-Gmane: http://gmane.org/ Original-To: help-gnu-emacs@gnu.org Original-Lines: 23 Original-X-Complaints-To: usenet@sea.gmane.org X-Gmane-NNTP-Posting-Host: 207.167.42.60 User-Agent: Mozilla Thunderbird 0.9 (X11/20041105) X-Accept-Language: en-us, en 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:31998 Archived-At: I've got 2 alists of (SYMBOL . "STRING") pairs, and I need to get the list of unique symbol names to pass to completing-read as its TABLE argument: (("SYMBOL-NAME") ...) I know about remove-duplicates and union, but I'd like to avoid using cl*.el functions. Since completing-read seems to ignore nil entries in TABLE, this is what I've got now: (nconc (mapcar (lambda (assoc) (list (symbol-name (car assoc)))) alist-1) (mapcar (lambda (assoc) (or (assq (car assoc) alist-1) (list (symbol-name (car assoc))))) alist-2)) Is there a cleaner way? Thanks, -- Kevin