From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Tak Kunihiro Newsgroups: gmane.emacs.bugs Subject: bug#50928: remove-dups Date: Fri, 1 Oct 2021 12:23:18 +0900 Message-ID: <4CCC2E52-1B22-4852-9ED6-52612CF7D786@misasa.okayama-u.ac.jp> Mime-Version: 1.0 (Mac OS X Mail 14.0 \(3654.120.0.1.13\)) Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="39369"; mail-complaints-to="usenet@ciao.gmane.io" To: 50928@debbugs.gnu.org Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane-mx.org@gnu.org Fri Oct 01 05:25:18 2021 Return-path: Envelope-to: geb-bug-gnu-emacs@m.gmane-mx.org Original-Received: from lists.gnu.org ([209.51.188.17]) by ciao.gmane.io with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1mW9Ak-000A58-48 for geb-bug-gnu-emacs@m.gmane-mx.org; Fri, 01 Oct 2021 05:25:18 +0200 Original-Received: from localhost ([::1]:42390 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1mW9Aj-0006VS-0f for geb-bug-gnu-emacs@m.gmane-mx.org; 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envelope-from=prvs=19082fb675=tkk@misasa.okayama-u.ac.jp; helo=mx0b-00602c01.pphosted.com X-Spam_score_int: -25 X-Spam_score: -2.6 X-Spam_bar: -- X-Spam_report: (-2.6 / 5.0 requ) BAYES_00=-1.9, RCVD_IN_DNSWL_LOW=-0.7, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list X-BeenThere: bug-gnu-emacs@gnu.org List-Id: "Bug reports for GNU Emacs, the Swiss army knife of text editors" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane-mx.org@gnu.org Original-Sender: "bug-gnu-emacs" Xref: news.gmane.io gmane.emacs.bugs:216002 Archived-At: I wanted to delete duplicated items from a list non-destructively. It took me a while to find out how to do so. (cl-remove-duplicates list :test 'equal) (delete-dups (copy-sequence list)) I think it is handy to have something like below in subr.el. Too obvious? #+begin_src emacs-lisp (defun remove-dups (list) "Remove 'equal' duplicates from LIST non-destructively. Note that `delete-dups' deletes duplicates destructively." (delete-dups (copy-sequence list))) #+end_src