A couple of shortcut methods on Func

core/src/main/scala/fluence/codec/MonadicalEitherArrow.scala

@@ -49,6 +49,7 @@ abstract class MonadicalEitherArrow[E <: Throwable] {
    * @tparam B Successful result type
    */
   abstract class Func[A, B] {
+    f ⇒
 
     /**
      * Run the func on input, using the given monad.
@@ -76,6 +77,30 @@ abstract class MonadicalEitherArrow[E <: Throwable] {
      */
     def apply[F[_]: Monad](input: A): EitherT[F, E, B]
 
+    /**
+     * Shortcut for function composition
+     *
+     * @param other Other function to run after
+     * @tparam C Resulting input type
+     * @return Composed function
+     */
+    def on[C](other: Func[C, A]): Func[C, B] =
+      catsMonadicalEitherArrowChoice.compose(this, other)
+
+    /**
+     * Convert this Func into another one, lifting the error
+     *
+     * @param m Another instance of MonadicalEitherArrow
+     * @param convertE Convert error
+     * @tparam EE Error type
+     * @return Converted function
+     */
+    def to[EE <: Throwable](m: MonadicalEitherArrow[EE])(implicit convertE: E ⇒ EE): m.Func[A, B] =
+      new m.Func[A, B] {
+        override def apply[F[_]: Monad](input: A): EitherT[F, EE, B] =
+          f[F](input).leftMap(convertE)
+      }
+
     /**
      * Converts this Func to Kleisli, using MonadError to execute upon and to lift errors into.
      *