Scala Language scalaz FunctorUsage
Example
import scalaz._
import Scalaz._
scala> val len: String => Int = _.length
len: String => Int = $$Lambda$1164/969820333@7e758f40
scala> Functor[Option].map(Some("foo"))(len)
res0: Option[Int] = Some(3)
scala> Functor[Option].map(None)(len)
res1: Option[Int] = None
scala> Functor[List].map(List("qwer", "adsfg"))(len)
res2: List[Int] = List(4, 5)
scala> :kind Functor
scalaz.Functor's kind is X[F[A]]
