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Functorial Blog - Comonads and Day Convolution
The Day convolution of two functors is another functor, defined as follows: data Day f g a where Day :: (x -> y -> a) -> f x -> g y -> Day f g a There is an implementation of Day in Edward Kmett's kan-extensions package on Hackage. Day Convolution of Comonads While writing my last post, I was looking for a way to combine comonads, and found out some interesting things about Day convolution in the
ruicc 2016/08/12
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Functorial Blog - Counterexamples of Type Classes
by Phil Freeman on 2015/12/06 In Haskell and PureScript, we are familiar with certain standard hierarchies of type classes. For example, here are some of the type classes provided by the PureScript core libraries: Semigroup, Monoid Semiring, Ring, CommutativeRing, EuclideanRing, Field Functor, Apply, Applicative, Bind, Monad Extend, Comonad Alt, Plus, Alternative Semigroupoid, Category Profunctor,
ruicc 2015/12/22
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