Understanding profunctorsProfunctors are bifunctors that are contravariant in their first type argument and covariant in their second one.#type-classes#profunctor#contravariance#covariance#functor#bifunctor·typeclasses.com·Aug 11, 2019Understanding profunctors
Understanding contravarianceit is often a surprise for people to learn that function composition is the `fmap` of functions#type-classes#functor#contravariance·typeclasses.com·Aug 11, 2019Understanding contravariance