From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!not-for-mail From: Emanuel Berg Newsgroups: gmane.emacs.help Subject: Re: `append' vs. `nconc' Date: Fri, 01 Jan 2016 14:26:02 +0100 Message-ID: <87h9ixtor9.fsf@debian.uxu> References: <568164D8.6050700@ojkastl.de> <87io3iyr7t.fsf@debian.uxu> <87si2kezg1.fsf@mithlond.arda> <87a8osrlj4.fsf_-_@debian.uxu> <87lh8bgafa.fsf@mithlond.arda> <87r3i3ch63.fsf@kuiper.lan.informatimago.com> <87si2jqee2.fsf@debian.uxu> <20151231093045.GB19900@tuxteam.de> NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: text/plain X-Trace: ger.gmane.org 1451655031 8761 80.91.229.3 (1 Jan 2016 13:30:31 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Fri, 1 Jan 2016 13:30:31 +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 Jan 01 14:30:22 2016 Return-path: Envelope-to: geh-help-gnu-emacs@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 1aEzmf-0006Ol-GM for geh-help-gnu-emacs@m.gmane.org; Fri, 01 Jan 2016 14:30:21 +0100 Original-Received: from localhost ([::1]:35931 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1aEzme-0002IT-P7 for geh-help-gnu-emacs@m.gmane.org; Fri, 01 Jan 2016 08:30:20 -0500 Original-Received: from eggs.gnu.org ([2001:4830:134:3::10]:43712) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1aEzmU-0002I6-2U for help-gnu-emacs@gnu.org; Fri, 01 Jan 2016 08:30:11 -0500 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1aEzmQ-0007MS-1c for help-gnu-emacs@gnu.org; Fri, 01 Jan 2016 08:30:10 -0500 Original-Received: from plane.gmane.org ([80.91.229.3]:51205) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1aEzmP-0007MO-QZ for help-gnu-emacs@gnu.org; Fri, 01 Jan 2016 08:30:05 -0500 Original-Received: from list by plane.gmane.org with local (Exim 4.69) (envelope-from ) id 1aEzmO-00068O-8e for help-gnu-emacs@gnu.org; Fri, 01 Jan 2016 14:30:04 +0100 Original-Received: from nl106-137-56.student.uu.se ([130.243.137.56]) by main.gmane.org with esmtp (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Fri, 01 Jan 2016 14:30:04 +0100 Original-Received: from embe8573 by nl106-137-56.student.uu.se with local (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Fri, 01 Jan 2016 14:30:04 +0100 X-Injected-Via-Gmane: http://gmane.org/ Mail-Followup-To: help-gnu-emacs@gnu.org Original-Lines: 29 Original-X-Complaints-To: usenet@ger.gmane.org X-Gmane-NNTP-Posting-Host: nl106-137-56.student.uu.se Mail-Copies-To: never User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/24.5 (gnu/linux) Cancel-Lock: sha1:6aUv30M1lQ7T52vFD3yZKaHPYt4= X-detected-operating-system: by eggs.gnu.org: Genre and OS details not recognized. X-Received-From: 80.91.229.3 X-BeenThere: help-gnu-emacs@gnu.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: Users list for the GNU Emacs text editor List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane.org@gnu.org Original-Sender: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane.org@gnu.org Xref: news.gmane.org gmane.emacs.help:108565 Archived-At: Barry Margolin writes: >> The thing here is, when it is very obvious and >> everything is small and easy to handle, what is the >> actual gain in time and space not using `append'? >> >> Answer: >> >> -> 0 >> >> But OK, as a matter of principle it can be a cool >> thing to know/do. > > NCONC was created at least 40 years ago, when > computers were slow and had very little memory (a > modern cellphone is has the power of a roomful of > 70's-era mainframes). And garbage collection was > also very slow (generational GC hadn't been > developed yet). > > So optimizations like NCONC could be very useful > back then. These days, the benefit is probably > very little. Q.E.D. :) -- underground experts united http://user.it.uu.se/~embe8573