Function combineMap

packages/typeclass/src/Foldable.ts:62–70

(F: Foldable<F>)

 * @since 0.24.0
 */
export const combineMap = <F extends TypeLambda>(F: Foldable<F>) =>
<M>(M: Monoid<M>): {
  <A>(f: (a: A) => M): <R, O, E>(self: Kind<F, R, O, E, A>) => M
  <R, O, E, A>(self: Kind<F, R, O, E, A>, f: (a: A) => M): M
} =>
  dual(
    2,
    <R, O, E, A>(self: Kind<F, R, O, E, A>, f: (a: A) => M): M => F.reduce(self, M.empty, (m, a) => M.combine(m, f(a)))
  )

/**
 * @since 0.24.0