[Haskell-cafe] Questions about Functor, Applicative, Monad

Kenn Knowles kenn at kennknowles.com
Mon May 5 22:54:01 UTC 2014

Hi Corentin,

This may be a good answer for some of your questions:


On Mon, May 5, 2014 at 6:31 PM, Corentin Dupont
<corentin.dupont at gmail.com>wrote:

> Hi everybody!
> Two questions in one:
> - When you define and instance of a Monad, why don't you get the
> Applicative and Functor instances for free? I seem that you can
> mechanically write them.
> - Do you have examples of things that are Functors but not Applicative?
> Applicative but not Monads?
> Tchuss
> Corentin
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