[Haskell-beginners] Re: The Applicative instance for ((->) a)

Ian Duncan wrote:

Hey folks, I understand most of what is going on with the applicative class, but I can't figure out why this instance is useful: "instance Applicative ((->) a) where..."

Can anyone offer some intuition into how this is could be used?

As hinted to in the paper on applicative functors, Applicative programming with effects Conor McBride, Ross Paterson. http://strictlypositive.org/IdiomLite.pdf the instance functors are the S and K combinators. http://en.wikipedia.org/wiki/SKI_combinator_calculus Regards, apfelmus -- http://apfelmus.nfshost.com