[Haskell-cafe] Applicative is like an Arrow

[Brandon Allbery]

On Fri, Aug 16, 2013 at 10:04 AM, Thiago Negri <evohunz at gmail.com> wrote:

> I just stumbled upon the Applicative term.
> Arrows are quite difficult for me to understand at the moment.
> I guess it needs time to digest.
>
> But, as I understand so far, Applicative and Arrows looks like the same
> thing.
>

Practically, that's not too far off. Arrows, at least as implemented
currently, have a number of significant restrictions based on the need for
the `arr` combinator to accomplish much of anything; Applicative has, as a
result, largely taken over the spot in the Haskell ecosystem that Arrow was
originally intended to fill.

My understanding is that there's a rework of Arrow in progress that may
change this in the future, since *theoretical* Arrows are more distinct,
flexible and useful than the current implementation.

-- 
brandon s allbery kf8nh                               sine nomine associates
allbery.b at gmail.com                                  ballbery at sinenomine.net
unix, openafs, kerberos, infrastructure, xmonad        http://sinenomine.net
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://www.haskell.org/pipermail/haskell-cafe/attachments/20130816/9f086142/attachment.htm>