From mboxrd@z Thu Jan  1 00:00:00 1970
Path: news.gmane.org!.POSTED!not-for-mail
From: Jean-Christophe Helary <brandelune@gmail.com>
Newsgroups: gmane.emacs.help
Subject: Re: concat vs format
Date: Sun, 9 Dec 2018 19:02:01 +0900
Message-ID: <4A03F880-46F5-47AA-BFA9-7CA09FB9D7AA@gmail.com>
References: <6038B67F-98A7-42B9-8486-97DB99D63033@gmail.com>
	<a91ff9fb-a52c-4a2f-8b57-5d108f502e68@default>
NNTP-Posting-Host: blaine.gmane.org
Mime-Version: 1.0 (Mac OS X Mail 12.1 \(3445.101.1\))
Content-Type: text/plain;
	charset=us-ascii
Content-Transfer-Encoding: quoted-printable
X-Trace: blaine.gmane.org 1544349638 23118 195.159.176.226 (9 Dec 2018 10:00:38 GMT)
X-Complaints-To: usenet@blaine.gmane.org
NNTP-Posting-Date: Sun, 9 Dec 2018 10:00:38 +0000 (UTC)
To: help-gnu-emacs <help-gnu-emacs@gnu.org>
Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane.org@gnu.org Sun Dec 09 11:00:34 2018
Return-path: <help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane.org@gnu.org>
Envelope-to: geh-help-gnu-emacs@m.gmane.org
Original-Received: from lists.gnu.org ([208.118.235.17])
	by blaine.gmane.org with esmtp (Exim 4.84_2)
	(envelope-from <help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane.org@gnu.org>)
	id 1gVvt1-0005tO-SN
	for geh-help-gnu-emacs@m.gmane.org; Sun, 09 Dec 2018 11:00:32 +0100
Original-Received: from localhost ([::1]:54472 helo=lists.gnu.org)
	by lists.gnu.org with esmtp (Exim 4.71)
	(envelope-from <help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane.org@gnu.org>)
	id 1gVvv8-00079t-4d
	for geh-help-gnu-emacs@m.gmane.org; Sun, 09 Dec 2018 05:02:42 -0500
Original-Received: from eggs.gnu.org ([2001:4830:134:3::10]:58264)
	by lists.gnu.org with esmtp (Exim 4.71)
	(envelope-from <brandelune@gmail.com>) id 1gVvue-00079d-Nc
	for help-gnu-emacs@gnu.org; Sun, 09 Dec 2018 05:02:13 -0500
Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71)
	(envelope-from <brandelune@gmail.com>) id 1gVvuZ-0003Ip-U1
	for help-gnu-emacs@gnu.org; Sun, 09 Dec 2018 05:02:12 -0500
Original-Received: from mail-pl1-x62e.google.com ([2607:f8b0:4864:20::62e]:35148)
	by eggs.gnu.org with esmtps (TLS1.0:RSA_AES_128_CBC_SHA1:16)
	(Exim 4.71) (envelope-from <brandelune@gmail.com>)
	id 1gVvuZ-0003IN-Lv
	for help-gnu-emacs@gnu.org; Sun, 09 Dec 2018 05:02:07 -0500
Original-Received: by mail-pl1-x62e.google.com with SMTP id p8so3851073plo.2
	for <help-gnu-emacs@gnu.org>; Sun, 09 Dec 2018 02:02:06 -0800 (PST)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025;
	h=from:mime-version:subject:date:references:to:in-reply-to:message-id; 
	bh=1on+pzOcSGukA/qR8n98XddEiF8pvVwRa9ZcRz677iI=;
	b=o5SLxi+VI091vGDc3mp/APrxOI2UnL5Ndpts94V/3wL+16UhwnGpGgqB8Lx1ZDxsip
	F3I1BITgqK3MwyKCXQEhHdwndChlQ7uAw5kNX6KbkV6i8FlWdOd9WnlTEAiL8dUJPtoB
	RuUa4WneO3kV+VvsZ3j79CtK4A/miz3fgutA0t+LtSE6NsHSXIeBtlzk37mzH3yHPjLo
	u6n/2igbEgyCePTmL+vkGtJRIi6FywuYF84I/V8JDoWgmMbxBIOD22KdFu7Ps9WjpvPg
	nB5D1OlzzlSqklO/kCflSf+Q6VXSJFEmENfhix384xxz0+esi9131mK5xhy7GwK8l5g9
	t/dQ==
X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed;
	d=1e100.net; s=20161025;
	h=x-gm-message-state:from:mime-version:subject:date:references:to
	:in-reply-to:message-id;
	bh=1on+pzOcSGukA/qR8n98XddEiF8pvVwRa9ZcRz677iI=;
	b=udaXcP1wIKbpccMyfDxMEuUxR59M1tKkJYllMKkiisdQAd99wSqfzWosg4cpfzcFkL
	lYk3p2tRVGHLnvbU7Z+B/rxLK9niZsNObKrjcL7DigGC+juRqdZO4K9rhjHA/MV2Rpjh
	fjc0grpfpRprq5h2lUevC+YB1HkRN+R0RqxishJLH0dj9TGGrsHAypzU02E0vJugEZBy
	3w5ookbb8TgFuAmOowKb1Y+WEB4cbOaQZg25kWpv0WKf6iyQoKM0WLEv5rv+6bdaNHxs
	BF/gAdN0ToEZWOUuIeNdJZ7Q2wEECO1QpdaCw5ihTy4FAFR65JCFmqKnY9SRwSkBTSpM
	vkeg==
X-Gm-Message-State: AA+aEWYqnfaLzlhHnUcvpSNdDV1zIHf1bvvd0R7JGThG8ilNW8TDxEVC
	BgyaEsrsyPFayt3vLThz3DctcbQs
X-Google-Smtp-Source: AFSGD/Uu5pUJTrdJ3AkoKlF7wTgBGfoDgGp9RkQadPX1q4lWBnxUpBQkWPLfBjbamVwoYV+fULSUXw==
X-Received: by 2002:a17:902:6502:: with SMTP id
	b2mr8069593plk.44.1544349725333; 
	Sun, 09 Dec 2018 02:02:05 -0800 (PST)
Original-Received: from [192.168.1.11] (pl16832.ag0304.nttpc.ne.jp. [128.53.251.192])
	by smtp.gmail.com with ESMTPSA id
	n22sm13795180pfh.166.2018.12.09.02.02.03 for <help-gnu-emacs@gnu.org>
	(version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128);
	Sun, 09 Dec 2018 02:02:04 -0800 (PST)
X-Priority: 3
In-Reply-To: <a91ff9fb-a52c-4a2f-8b57-5d108f502e68@default>
X-Mailer: Apple Mail (2.3445.101.1)
X-detected-operating-system: by eggs.gnu.org: Genre and OS details not
	recognized.
X-Received-From: 2607:f8b0:4864:20::62e
X-Content-Filtered-By: Mailman/MimeDel 2.1.21
X-BeenThere: help-gnu-emacs@gnu.org
X-Mailman-Version: 2.1.21
Precedence: list
List-Id: Users list for the GNU Emacs text editor <help-gnu-emacs.gnu.org>
List-Unsubscribe: <https://lists.gnu.org/mailman/options/help-gnu-emacs>,
	<mailto:help-gnu-emacs-request@gnu.org?subject=unsubscribe>
List-Archive: <http://lists.gnu.org/archive/html/help-gnu-emacs/>
List-Post: <mailto:help-gnu-emacs@gnu.org>
List-Help: <mailto:help-gnu-emacs-request@gnu.org?subject=help>
List-Subscribe: <https://lists.gnu.org/mailman/listinfo/help-gnu-emacs>,
	<mailto:help-gnu-emacs-request@gnu.org?subject=subscribe>
Errors-To: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane.org@gnu.org
Original-Sender: "help-gnu-emacs"
	<help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane.org@gnu.org>
Xref: news.gmane.org gmane.emacs.help:118931
Archived-At: <http://permalink.gmane.org/gmane.emacs.help/118931>



> On Dec 9, 2018, at 13:09, Drew Adams <drew.adams@oracle.com> wrote:
>=20
>> Is there a difference between:
>> (concat firstPartofURL secondPartofURL) and
>> (format "%s%s" firstPartofURL secondPartofURL)?
>=20
> If both args are strings then no; the result
> is the same.  But the functions are very
> different - they take different args and,
> aside from some cases like this one where
> the result is the same for some args, their
> uses/purposes are different.

Thank you.

I'm trying to create URLs from dates and at one point I get a concat =
that outputs "/path/to/url/..." instead of =
"/path/to/url/12/04/index.html".
I checked the code and put format instead of concat and got the same =
result. All the things I try to concat are strings that I progressively =
build over other strings, and edebug gives me correct values up to the =
point where the wrong string is created...

I'm going to re-check the whole thing...

Jean-Christophe Helary
-----------------------------------------------
http://mac4translators.blogspot.com @brandelune