Add flipped fmap

[Felipe Lessa]

On Thu, Apr 8, 2010 at 9:45 AM, Bas van Dijk <v.dijk.bas at gmail.com> wrote:
> I must say that Brent Yorheys comment about (<**>) not being flip
> (<*>) has made the 'symmetry' argument less convincing and has moved
> me a bit closer to the - camp. However, I'm still for adding it
> because it can make code nicer.

They -- <**> and <$$> -- are symmetric in spirit.  In the case of <$>
and <$$>, the order in which things are evaluated doesn't matter.  So
we may say that <*>, <$>, <**> and <$$> are "always read from left to
right" if we want to.  Well, at least that's how I think ;).

I too would like to see more people reporting their thoughts on this issue.

Cheers,

-- 
Felipe.