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

Here are a couple of examples

(+) <$> Just 7 <*> Just 8 Just 15

(*) <$> [1, 2, 3] <*> [4, 5, 6] [4,5,6,8,10,12,12,15,18]

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?

Ian Duncan

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