[Haskell-beginners] Re: Re: Design Question: fmap with two lists

Brent Yorgey byorgey at seas.upenn.edu
Sun Dec 27 09:07:35 EST 2009

On Sat, Dec 26, 2009 at 06:12:00PM +0100, Maciej Piechotka wrote:
> On Fri, 2009-12-25 at 21:10 -0500, Brent Yorgey wrote:
> > There is such a class in the category-extras package, although it is
> > so general that it is probably not worth the effort of trying to
> > understand it unless you really need the extra abstraction.
> > 
> > -Brent
> For the record - what is the name of it? I tried to search through
> category-extras twice.

Control.Functor.Bifunctor.  It took me a while to find it, too (I've
had to re-find it several times); I didn't actually say where to find
it in my first email because I knew it would take me a long time.
Unfortunately, coherent organization is not among category-extras'
strengths. ;-)


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