Am Mittwoch, 23. April 2008 23:55 schrieb Cale Gibbard:
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Rename fmap to map
This would be really great! There is no point in having a map just for lists and a general map for functors since the list map is the same as the list instance’s functor map. And identifiers with a single lowercase letter in front or after a lowercase word (fmap, foldr, etc.) are not nice, in my opinion.
(like it was in Haskell 1.4),
It really was this way in Haskell 1.4? Why was it changed?
and define (.) as a synonym for it.
I don’t think that this is reasonable. (.) corresponds to the little circle in math which is a composition. So (.) = (<<<) would be far better.
Additionally, add the instance:
instance Functor ((->) e) where map f g x = f (g x)
(and hopefully the corresponding Monad instance as well)
And hopefully the corresponding Applicative instance as well! Applicative functors are a very nice thing. (So a big “thank you” to Conor and Ross.)
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Best wishes, Wolfgang