From: Stefan Holdermans <stefan@vectorfabrics.com>
To: Dawid Toton <d0@wp.pl>
Cc: caml-list <caml-list@yquem.inria.fr>
Subject: Re: [Caml-list] What is an applicative functor?
Date: Fri, 8 Apr 2011 07:35:23 +0200 [thread overview]
Message-ID: <AC52E26B-80E8-4380-A4D8-D346D98A3132@vectorfabrics.com> (raw)
In-Reply-To: <4D9E28D2.1050808@wp.pl>
Dawid,
> What does it mean that a functor is applicative?
> Is there any analogy between applicative functors in OCaml and the Applicative type class of Haskell?
There is no analogy; functors in Caml are quite different from functors in Haskell. In Caml, a Functor is a higher-order module, i.e., a module that takes other modules as input in order to produce a proper module. In Haskell, Functor is a type class: essentially, the collection of types of kind * -> * that come with a structure preserving, covariant map operation. Applicative functors are members of this collection that fulfill some extra requirements.
Cheers,
Stefan
prev parent reply other threads:[~2011-04-08 5:35 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-04-07 21:12 Dawid Toton
2011-04-07 21:49 ` Gerd Stolpmann
2011-04-08 0:44 ` [Caml-list] " Dawid Toton
2011-04-08 1:34 ` Gerd Stolpmann
2011-04-08 6:50 ` [Caml-list] " Andreas Rossberg
2011-04-08 8:04 ` Alain Frisch
2011-04-08 8:20 ` Jacques Garrigue
2011-04-08 8:38 ` Jacques Garrigue
2011-04-08 8:44 ` Alain Frisch
2011-04-08 10:09 ` Jacques Garrigue
2011-04-08 11:25 ` Julien Signoles
2011-04-08 11:58 ` Alain Frisch
2011-04-11 7:10 ` Julien Signoles
2011-04-11 7:21 ` Julien Signoles
2011-04-08 13:43 ` rossberg
2011-04-08 16:26 ` Julien Signoles
2011-04-13 2:36 ` Lucas Dixon
2011-04-13 7:23 ` Andreas Rossberg
2011-04-15 3:08 ` Lucas Dixon
2011-04-19 14:04 ` Andreas Rossberg
2011-04-08 16:43 ` Till Varoquaux
2011-04-08 17:35 ` Alain Frisch
2011-04-08 18:44 ` Andreas Rossberg
2011-04-08 21:23 ` Lauri Alanko
2011-04-08 21:34 ` Guillaume Yziquel
2011-04-09 11:41 ` Andreas Rossberg
2011-04-08 5:35 ` Stefan Holdermans [this message]
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=AC52E26B-80E8-4380-A4D8-D346D98A3132@vectorfabrics.com \
--to=stefan@vectorfabrics.com \
--cc=caml-list@yquem.inria.fr \
--cc=d0@wp.pl \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox