samples of monad transformers in scalaz

gistfile1.sbt

scala> List(10, 12).transLift[OptionT].runT
res12: List[Option[Int]] = List(Some(10), Some(12))

scala> optionT(List(some(12), some(50))).runT
res13: List[Option[Int]] = List(Some(12), Some(50))

scala> List(some(12), some(50))
res14: List[Option[Int]] = List(Some(12), Some(50))

scala> optionT(List(some(12), some(50)))
res15: scalaz.OptionT[List,Int] = scalaz.OptionTs$$anon$1@1541633

scala> res15 existsT (_ == 12)
res16: List[Boolean] = List(true, false)

scala> res15.map(_ * 2)
res17: scalaz.OptionT[List,Int] = scalaz.OptionTs$$anon$1@3e6d51

scala> res15.map(_ * 2).runT
res18: List[Option[Int]] = List(Some(24), Some(100))

scala> List(10, 12).transLift[OptionT].map(_ * 2).runT
res19: List[Option[Int]] = List(Some(20), Some(24))

scala> some(12).transLift[OptionT].map(_ * 2).runT
res20: Option[Option[Int]] = Some(Some(24))