Lift example 2

lift_example2.scala

def lift3[A, B, C, D](f: Function3[A, B, C, D]): Function3[Option[A], Option[B], Option[C], Option[D]] = {
  (oa: Option[A], ob: Option[B], oc: Option[C]) =>
    for {
      a <- oa
      b <- ob
      c <- oc
    } yield f(a, b, c)
}


case class Foo(a: Int, b: Int, c: Int)

def getFoo(a: Int, b: Int, c: Int): Foo = Foo(a, b, c)

val liftGetFoo: (Option[Int], Option[Int], Option[Int]) => Option[Foo] = lift3(getFoo)

val a = Option(1)
val b = Option(2)
val c = Option(3)

liftGetFoo(a, b, c) // Some(Foo(1,2,3))
liftGetFoo(a, b, None ) // None