From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Lars Ingebrigtsen Newsgroups: gmane.emacs.devel Subject: Re: Add hints to documentation of car and cdr for (e)lisp newcomers - take 2 Date: Thu, 15 Jul 2021 06:38:12 +0200 Message-ID: <87bl74ry2z.fsf@gnus.org> References: <8735shrl57.fsf@tullinup.koldfront.dk> <83v95c7v3v.fsf@gnu.org> <87bl74evd7.fsf@gnus.org> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="4827"; mail-complaints-to="usenet@ciao.gmane.io" User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/28.0.50 (gnu/linux) Cc: Eli Zaretskii , Adam =?utf-8?Q?Sj=C3=B8gren?= , Emacs developers To: Stefan Kangas Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Thu Jul 15 06:39:12 2021 Return-path: Envelope-to: ged-emacs-devel@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 1m3t9T-0000z3-Rw for ged-emacs-devel@m.gmane-mx.org; Thu, 15 Jul 2021 06:39:11 +0200 Original-Received: from localhost ([::1]:43442 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1m3t9S-0002mz-TU for ged-emacs-devel@m.gmane-mx.org; Thu, 15 Jul 2021 00:39:10 -0400 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:37732) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1m3t8e-0001fl-MO for emacs-devel@gnu.org; Thu, 15 Jul 2021 00:38:20 -0400 Original-Received: from quimby.gnus.org ([2a01:4f9:2b:f0f::2]:41452) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1m3t8d-0002Ni-2N; Thu, 15 Jul 2021 00:38:20 -0400 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=gnus.org; s=20200322; h=Content-Transfer-Encoding:Content-Type:MIME-Version:Message-ID :In-Reply-To:Date:References:Subject:Cc:To:From:Sender:Reply-To:Content-ID: Content-Description:Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc :Resent-Message-ID:List-Id:List-Help:List-Unsubscribe:List-Subscribe: List-Post:List-Owner:List-Archive; bh=ZXS9hp5e0D5I4INCTnUI4uN6p8lRPuEiDMCmRFgCmdc=; b=RB6GBr9PKaiDgQTzadYmuRMqnG pQczqHAnBLABbuH7WcV23vD/VA4bj7ar29aogR6dgYSMDdqhpuNDtc2Gw3MKgp8s78lItAMjNzSsE Ma837+YoQe/GRT1+4QVfA6aYzrQgEj/6icKoVSueF9y++W5ZlyBeDNCyBq3sTIjlsrfQ=; Original-Received: from cm-84.212.220.105.getinternet.no ([84.212.220.105] helo=elva) by quimby.gnus.org with esmtpsa (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1m3t8W-0003kw-S9; Thu, 15 Jul 2021 06:38:15 +0200 Face: iVBORw0KGgoAAAANSUhEUgAAADAAAAAwBAMAAAClLOS0AAAABGdBTUEAALGPC/xhBQAAACBj SFJNAAB6JgAAgIQAAPoAAACA6AAAdTAAAOpgAAA6mAAAF3CculE8AAAALVBMVEUFBAsPESopFRpd FB/PKzbVXp1JT0PdtUy7vMOUDhpBiiEhJFk/XKJckM/////cWtUyAAAAAWJLR0QOb70wTwAAAAd0 SU1FB+UHDwQfGlcvs+8AAAFRSURBVDjLY2CAAAEG+gEmYyVlBWwSLKEhoQ7YJFSAEk5YzElgS04z NoByGYGeYAKz2CrawLQgQi0jVKIMrLHcGc0otrQkMFXuiSLcXgGzaoonsjkM7eWwANNENarchQGL hKYlzJEMSgxKSkgeczFggASFiQtKkIAkIFZMmYmQYFJSYALqFgC7QokRoZzTBRQ8TDNBwADZHLCE ANMEJSVNYyQJJSUmMJcJSDApCiAkVq2C2pSAFkIEJTCS0LZEKEMBTWL3bqhRBgw4gLERugh3Nshe prQ0QSAQQIpYnt6LoGi5c/YMEN65i+QIQQFpaRj3zA0U1+09cQDmljM4JBjgcQ0G0jIbEOwbG5D1 MOyIhkl0oAbOjmCYxF1UHfCwYhRCDzWYxG50CcaNG8GUIKbSjbjCkYFRgBG7BYyCikIK2CTE0tLS ErBJCCoJauNwLB0BAObeQfYY7VR9AAAAJXRFWHRkYXRlOmNyZWF0ZQAyMDIxLTA3LTE1VDA0OjMx OjI2KzAwOjAwOxnKwgAAACV0RVh0ZGF0ZTptb2RpZnkAMjAyMS0wNy0xNVQwNDozMToyNiswMDow MEpEcn4AAAAASUVORK5CYII= X-Now-Playing: Squarepusher's _Be Up A Hello_: "Hitsonu" In-Reply-To: (Stefan Kangas's message of "Thu, 15 Jul 2021 01:49:23 +0200") Received-SPF: pass client-ip=2a01:4f9:2b:f0f::2; envelope-from=larsi@gnus.org; helo=quimby.gnus.org X-Spam_score_int: -27 X-Spam_score: -2.8 X-Spam_bar: -- X-Spam_report: (-2.8 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, 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: emacs-devel@gnu.org X-Mailman-Version: 2.1.23 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-mx.org@gnu.org Original-Sender: "Emacs-devel" Xref: news.gmane.io gmane.emacs.devel:271234 Archived-At: Stefan Kangas writes: > The R6RS does it with examples: > > (car pair) procedure > > Returns the contents of the car field of pair. > > (car =E2=80=99(a b c)) =E2=87=92 a > (car =E2=80=99((a) b c d)) =E2=87=92 (a) > (car =E2=80=99(1 . 2)) =E2=87=92 1 > (car =E2=80=99()) &assertion exception Yeah, perhaps that'd be nice? Something like: (car '(a b c)) =3D> a (car '(1 . 2)) =3D> 1 (car nil) =3D> nil=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20 Also see `cdr'. --=20 (domestic pets only, the antidote for overdose, milk.) bloggy blog: http://lars.ingebrigtsen.no