Foldable, Monoid and Monad
Consider the following signature of foldMap
foldMap :: (Foldable t, Monoid m) => (a -> m) -> t a -> m
This is very similar to "bind", just with the arguments swapped:
(>>=) :: Monad m => m a -> (a -> m b) -> m b
It seems to me that there therefore must be some sort of relationship between Foldable, Monoid and Monad, but I can't find it in the superclasses. Presumably I can transform one or two of these into the other but I'm not sure how.
Could that relationship be detailed?