2 Matching Annotations
  1. Oct 2014
    1. foldMap :: Monoid m -> (a -> m) -> t a -> m

      I'm not sure, but I think what he meant here was foldMap :: Monoid m => (a -> m) -> t a -> m.

    2. The notion behind it was that one could decompose, e.g., Applicative into an instance of the Pointed typeclass and an instance of the Apply typeclass (giving apply :: f (a -> b) -> f a -> f b) and an instance of Pointed, such that the two interact properly.

      There's more on Applicative (and Functor) here, in case you're unfamiliar with it.