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Home Page: https://github.com/dehun/learn-fp
License: GNU General Public License v3.0
learn-by-doing course/tutorial for functional programming on scala
Home Page: https://github.com/dehun/learn-fp
License: GNU General Public License v3.0
Your implementation of cofunctor is actualy Contravariant Functor
. A real cofunctor is identical to functor.
Incorrectly naming it Cofunctor
is bound to confuse people whenever they try to understand that a CoFoo
is just Foo
with reversed arrows.
fmap :: (a -> b) -> f a -> f b
coFmap :: (b -> a) -> f b -> f a
contramap :: (b -> a) -> f a -> f b
Often times, people will just use the name Contravariant
in place of Contravariant Functor
. Please do not use Cofunctor
to mean Contravariant Functor
, though.
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