Re: [Haskell-beginners] Folding an applicative functor, wait, .. what?

On Sat, 2011-01-08 at 10:53 -0200, Felipe Almeida Lessa wrote:

On Sat, Jan 8, 2011 at 10:45 AM, Arlen Cuss wrote:

...

I think there is probably an obvious solution I've missed... and hold on a minute!

map (mconcat [show, anotherFunc, yetAnotherFunc]) [1..20]

I just stumbled upon this. While I'm not 100% confident on what's just happened here, I thought I'd mail this out for everyone to enjoy the learning process that has been this email.

That's the Monoid b => Monoid (a->b) instance [1], but I don't think it is anywhere near obvious =).

Right you are! I know what's going on now :-) Cheers!

Cheers!

[1] http://hackage.haskell.org/packages/archive/base/4.3.0.0/doc/html/src/Data-M...)

Arlen