Re: [Haskell-beginners] Monad for Pair

"But how do you take an arbitrary type and turn it into a monoid?” I didn’t - I must have been dreaming about Haskell at that point :) (My wife once dreamt she was a C compiler - go figure… C !!??) No, just Monad, Applicative and Functor - my mistake. Thanks Mike

On 19 Nov 2015, at 06:34, Kim-Ee Yeoh wrote:

On Thu, Nov 19, 2015 at 1:33 AM, Mike Houghton mailto:mike_k_houghton@yahoo.co.uk> wrote:

The source is just me exploring.

Nice.

I first looked at

data C a = C a deriving (Show)

and made Monad, Applicative, Monoid and Functors for it.

Even though the null-effect instances for the identity functor are trivial, there's value in writing them out, especially for the motivated.

But how do you take an arbitrary type and turn it into a monoid?

-- Kim-Ee _______________________________________________ Beginners mailing list Beginners@haskell.org http://mail.haskell.org/cgi-bin/mailman/listinfo/beginners