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Add .mapM #7

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8 changes: 8 additions & 0 deletions src/main/scala/gov/wicourts/json/formlet/Formlet.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -8,6 +8,7 @@ import scalaz.syntax.bifunctor._
import scalaz.syntax.either._
import scalaz.syntax.monad._
import scalaz.syntax.monoid._
import scalaz.syntax.traverse.{ToFunctorOps => _, _}
import scalaz.syntax.validation._

import scala.language.higherKinds
Expand Down Expand Up @@ -69,6 +70,13 @@ case class Formlet[M[_], N[_, _], I, V, E, A](run: I => M[(N[E, A], V)]) {
): Formlet[M, N, I, W, EE, AA] =
Formlet(c => M.bind(run(c))(f.tupled))

def mapM[B](
f: A => M[B]
)(
implicit M: Monad[M], N: Traverse[N[E, ?]]
): Formlet[M, N, I, V, E, B] =
mapResultM { case (n, v) => n.traverse(f).map((_, v)) }

def local[X](f: X => I): Formlet[M, N, X, V, E, A] = Formlet(run compose f)

def contramap[X](f: X => I): Formlet[M, N, X, V, E, A] = local(f)
Expand Down