From: "Pascal J. Bourguignon" <pjb@informatimago.com>
To: emacs-devel@gnu.org
Subject: Re: Why (substring "abc" 0 4) does not return "abc" instead of an error?
Date: Mon, 16 Jul 2012 22:19:54 +0200 [thread overview]
Message-ID: <87629ntq51.fsf@kuiper.lan.informatimago.com> (raw)
In-Reply-To: 87hat7bqmh.fsf@gnu.org
Bastien <bzg@gnu.org> writes:
> Stefan Monnier <monnier@IRO.UMontreal.CA> writes:
>
>> We have general functionality when you want to ignore some errors, such
>> as condition-case.
>
> Also, I'm fine with
>
> (substring "abc" -1 1)
> => #ERROR
>
> so using ̀condition-case' would not help me distinguish
> between the case above and (substring "abc" 0 4), which
> is what I want.
>
> I see the benefit of having
>
> (substring "abc" 0 4)
> => "abc"
>
> in terms of simplifying Elisp writing -- and I still fail
> to see the harm (but maybe Pascal will tell me where he has
> been bitten by this.)
There would have been no harm if the language/library had been designed
that way. It's arbitrary. But since it has been designed the other
way, there would be harm if that changed. There are a ton of code that
expects the original behavior.
--
__Pascal Bourguignon__ http://www.informatimago.com/
A bad day in () is better than a good day in {}.
next prev parent reply other threads:[~2012-07-16 20:19 UTC|newest]
Thread overview: 42+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-07-15 23:15 Why (substring "abc" 0 4) does not return "abc" instead of an error? Bastien
2012-07-15 23:29 ` Juanma Barranquero
2012-07-15 23:59 ` Bastien
2012-07-16 0:10 ` Juanma Barranquero
2012-07-16 7:14 ` Bastien
2012-07-16 16:15 ` Stefan Monnier
2012-07-16 16:22 ` Bastien
2012-07-16 16:46 ` Bastien
2012-07-16 17:57 ` Tassilo Horn
2012-07-16 18:51 ` Lars Magne Ingebrigtsen
2012-07-16 19:30 ` Bastien
2012-07-16 19:30 ` Tassilo Horn
2012-07-16 20:20 ` Pascal J. Bourguignon
2012-07-16 19:25 ` Bastien
2012-07-16 19:43 ` Bastien
2012-07-16 20:19 ` Pascal J. Bourguignon [this message]
2012-07-16 20:30 ` Stefan Monnier
2012-07-16 22:28 ` Lennart Borgman
2012-07-16 22:48 ` Bastien
2012-07-16 22:53 ` Lennart Borgman
2012-07-16 7:38 ` Andreas Schwab
2012-07-16 9:40 ` Juanma Barranquero
-- strict thread matches above, loose matches on Subject: below --
2012-07-16 3:45 Dmitry Gutov
2012-07-16 7:32 ` Bastien
2012-07-16 7:52 ` Thierry Volpiatto
2012-07-16 8:38 ` Bastien
2012-07-16 13:03 ` Dmitry Gutov
2012-07-16 14:32 ` Bastien
2012-07-16 13:10 ` Pascal J. Bourguignon
2012-07-16 14:40 ` Bastien
2012-07-16 15:00 ` Pascal J. Bourguignon
2012-07-16 15:07 ` Lennart Borgman
2012-07-16 15:19 ` Pascal J. Bourguignon
2012-07-16 15:22 ` Bastien
2012-07-16 15:46 ` Bastien
2012-07-16 15:49 ` Bastien
2012-07-16 19:49 ` Thien-Thi Nguyen
2012-07-16 22:32 ` Bastien
2012-07-16 15:56 ` Pascal J. Bourguignon
2012-07-16 16:13 ` Bastien
2012-07-16 19:00 Dmitry Gutov
2012-07-16 19:51 ` Tassilo Horn
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