From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!not-for-mail From: David Kastrup Newsgroups: gmane.emacs.devel Subject: Re: (n)reverse vs. length Date: Wed, 14 May 2014 22:12:16 +0200 Organization: Organization?!? Message-ID: <87r43wrufz.fsf@fencepost.gnu.org> References: <53737B79.7020704@yandex.ru> NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: text/plain X-Trace: ger.gmane.org 1400098415 29897 80.91.229.3 (14 May 2014 20:13:35 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Wed, 14 May 2014 20:13:35 +0000 (UTC) To: emacs-devel@gnu.org Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane.org@gnu.org Wed May 14 22:13:29 2014 Return-path: Envelope-to: ged-emacs-devel@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 1WkfYO-00067v-0e for ged-emacs-devel@m.gmane.org; Wed, 14 May 2014 22:13:28 +0200 Original-Received: from localhost ([::1]:54163 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1WkfYL-0003PH-6N for ged-emacs-devel@m.gmane.org; Wed, 14 May 2014 16:13:25 -0400 Original-Received: from eggs.gnu.org ([2001:4830:134:3::10]:43744) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1WkfXs-0002dP-CG for emacs-devel@gnu.org; Wed, 14 May 2014 16:13:02 -0400 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1WkfXm-0005pD-FT for emacs-devel@gnu.org; Wed, 14 May 2014 16:12:56 -0400 Original-Received: from plane.gmane.org ([80.91.229.3]:54923) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1WkfXm-0005p9-8i for emacs-devel@gnu.org; Wed, 14 May 2014 16:12:50 -0400 Original-Received: from list by plane.gmane.org with local (Exim 4.69) (envelope-from ) id 1WkfXh-0005Kz-0N for emacs-devel@gnu.org; Wed, 14 May 2014 22:12:45 +0200 Original-Received: from x2f4ad98.dyn.telefonica.de ([2.244.173.152]) by main.gmane.org with esmtp (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Wed, 14 May 2014 22:12:45 +0200 Original-Received: from dak by x2f4ad98.dyn.telefonica.de with local (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Wed, 14 May 2014 22:12:45 +0200 X-Injected-Via-Gmane: http://gmane.org/ Original-Lines: 23 Original-X-Complaints-To: usenet@ger.gmane.org X-Gmane-NNTP-Posting-Host: x2f4ad98.dyn.telefonica.de X-Face: 2FEFf>]>q>2iw=B6, xrUubRI>pR&Ml9=ao@P@i)L:\urd*t9M~y1^:+Y]'C0~{mAl`oQuAl \!3KEIp?*w`|bL5qr,H)LFO6Q=qx~iH4DN; i"; /yuIsqbLLCh/!U#X[S~(5eZ41to5f%E@'ELIi$t^ Vc\LWP@J5p^rst0+('>Er0=^1{]M9!p?&:\z]|;&=NP3AhB!B_bi^]Pfkw User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/24.4.50 (gnu/linux) Cancel-Lock: sha1:vUERLyvJRjzZzx4qm2JfgiXla1Y= X-detected-operating-system: by eggs.gnu.org: Genre and OS details not recognized. X-Received-From: 80.91.229.3 X-BeenThere: emacs-devel@gnu.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: "Emacs development discussions." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: emacs-devel-bounces+ged-emacs-devel=m.gmane.org@gnu.org Original-Sender: emacs-devel-bounces+ged-emacs-devel=m.gmane.org@gnu.org Xref: news.gmane.org gmane.emacs.devel:171841 Archived-At: Stefan Monnier writes: >> Should (n)reverse has the same semantics as length, i.e. accept >> vectors and strings as well? > > Good question. > >> IMHO this is the convenient and expected behavior from the point of >> view of the elisp programmer. > > Elisp is pretty lame and messy in this respect. > E.g. we have elt/aref/nth which operate on various subsets of sequences. > We have mapc/mapcar which apply to lists and arrays (and strings), but > mapcar returns a list in any case. > > I think it would be OK to make `reverse' work on arrays and strings. > I definitely don't want `nreverse' working on strings (strings should > be immutable), Doesn't aset work on strings? -- David Kastrup