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Re: (n)reverse vs. length

From: Stefan Monnier
Subject: Re: (n)reverse vs. length
Date: Wed, 14 May 2014 15:10:47 -0400
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/24.4.50 (gnu/linux)

> 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.


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