foldMapO<B> method

Option<B> foldMapO<B>(
  1. Semigroup<B> si,
  2. B f(
    1. A a
    )
)

Implementation

Option<B> foldMapO<B>(Semigroup<B> si, B f(A a)) => foldMap(OptionMonoid(si), composeF(some, f));