From: Stefan Monnier <monnier@IRO.UMontreal.CA>
To: Dmitry Antipov <dmantipov@yandex.ru>
Cc: Emacs development discussions <emacs-devel@gnu.org>
Subject: Re: (n)reverse vs. length
Date: Wed, 14 May 2014 15:10:47 -0400 [thread overview]
Message-ID: <jwvha4stc2u.fsf-monnier+emacs@gnu.org> (raw)
In-Reply-To: <53737B79.7020704@yandex.ru> (Dmitry Antipov's message of "Wed, 14 May 2014 18:19:37 +0400")
> 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), but I guess making it work on arrays is fine.
Stefan
next prev parent reply other threads:[~2014-05-14 19:10 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-05-14 14:19 (n)reverse vs. length Dmitry Antipov
2014-05-14 19:10 ` Stefan Monnier [this message]
2014-05-14 20:12 ` David Kastrup
2014-05-15 1:45 ` Stefan Monnier
2014-05-15 4:29 ` Dmitry Antipov
2014-05-15 5:49 ` David Kastrup
2014-05-15 12:38 ` Stefan Monnier
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