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gabro/transformers-ftw.scala

Last active August 29, 2015 14:14
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OptionT exercise
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transformers-ftw.scala
import scalaz._; import Scalaz._
import scala.concurrent.Future
import scala.concurrent.ExecutionContext.Implicits.global
def getInteger(x: Int): OptionT[Future, Int] = 42.point[Future].liftM[OptionT]
def computeList(n: Int): OptionT[Future, List[Int]] = (1 to n).toList.traverseU(getInteger)
//if you need a Future[OptionT[List[Int]]] just use run
computeList(3).run // Some(List(1, 2, 3))
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