OptionT

Value Members

1. final def !=(arg0: Any): Boolean

   

   Definition Classes

   AnyRef → Any

2. final def ##(): Int

   

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3. final def ==(arg0: Any): Boolean

   

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4. def ===(that: OptionT[F, A])(implicit eq: Eq[F[Option[A]]]): Boolean

   

5. final def asInstanceOf[T0]: T0

   

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   Any

6. def cata[B](default: ⇒ B, f: (A) ⇒ B)(implicit F: Functor[F]): F[B]

   

   Catamorphism on the Option.

   Catamorphism on the Option. This is identical to fold, but it only has one parameter list, which can result in better type inference in some contexts.

7. def clone(): AnyRef

   

   Attributes

   protected[java.lang]

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   Annotations

   @throws( ... )

8. def collect[B](f: PartialFunction[A, B])(implicit F: Functor[F]): OptionT[F, B]

   

9. def compare(that: OptionT[F, A])(implicit o: Order[F[Option[A]]]): Int

   

10. final def eq(arg0: AnyRef): Boolean

    

    Definition Classes

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11. def exists(f: (A) ⇒ Boolean)(implicit F: Functor[F]): F[Boolean]

    

12. def filter(p: (A) ⇒ Boolean)(implicit F: Functor[F]): OptionT[F, A]

    

13. def filterNot(p: (A) ⇒ Boolean)(implicit F: Functor[F]): OptionT[F, A]

    

14. def finalize(): Unit

    

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    protected[java.lang]

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    @throws( classOf[java.lang.Throwable] )

15. def flatMap[B](f: (A) ⇒ OptionT[F, B])(implicit F: Monad[F]): OptionT[F, B]

    

16. def flatMapF[B](f: (A) ⇒ F[Option[B]])(implicit F: Monad[F]): OptionT[F, B]

    

17. def fold[B](default: ⇒ B)(f: (A) ⇒ B)(implicit F: Functor[F]): F[B]

    

18. def foldLeft[B](b: B)(f: (B, A) ⇒ B)(implicit F: Foldable[F]): B

    

19. def foldRight[B](lb: Eval[B])(f: (A, Eval[B]) ⇒ Eval[B])(implicit F: Foldable[F]): Eval[B]

    

20. def forall(f: (A) ⇒ Boolean)(implicit F: Functor[F]): F[Boolean]

    

21. final def getClass(): Class[_]

    

    Definition Classes

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22. def getOrElse(default: ⇒ A)(implicit F: Functor[F]): F[A]

    

23. def getOrElseF(default: ⇒ F[A])(implicit F: Monad[F]): F[A]

    

24. def isDefined(implicit F: Functor[F]): F[Boolean]

    

25. def isEmpty(implicit F: Functor[F]): F[Boolean]

    

26. final def isInstanceOf[T0]: Boolean

    

    Definition Classes

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27. def map[B](f: (A) ⇒ B)(implicit F: Functor[F]): OptionT[F, B]

    

28. def mapFilter[B](f: (A) ⇒ Option[B])(implicit F: Functor[F]): OptionT[F, B]

    

29. def mapK[G[_]](f: ~>[F, G]): OptionT[G, A]

    

    Modify the context F using transformation f.

30. final def ne(arg0: AnyRef): Boolean

    

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31. final def notify(): Unit

    

    Definition Classes

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32. final def notifyAll(): Unit

    

    Definition Classes

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33. def orElse(default: ⇒ OptionT[F, A])(implicit F: Monad[F]): OptionT[F, A]

    

34. def orElseF(default: ⇒ F[Option[A]])(implicit F: Monad[F]): OptionT[F, A]

    

35. def partialCompare(that: OptionT[F, A])(implicit p: PartialOrder[F[Option[A]]]): Double

    

36. def semiflatMap[B](f: (A) ⇒ F[B])(implicit F: Monad[F]): OptionT[F, B]

    

37. def show(implicit F: Show[F[Option[A]]]): String

    

38. def subflatMap[B](f: (A) ⇒ Option[B])(implicit F: Functor[F]): OptionT[F, B]

    

39. final def synchronized[T0](arg0: ⇒ T0): T0

    

    Definition Classes

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40. def toLeft[R](right: ⇒ R)(implicit F: Functor[F]): EitherT[F, A, R]

    

41. def toNested: Nested[F, Option, A]

    

    Transform this OptionT[F, A] into a Nested[F, Option, A].

    Transform this OptionT[F, A] into a Nested[F, Option, A].

    An example where toNested can be used, is to get the Apply.ap function with the behavior from the composed Apply instances from F and Option, which is inconsistent with the behavior of the ap from Monad of OptionT.

    scala> import cats.implicits._
    scala> import cats.data.OptionT
    scala> val ff: OptionT[List, Int => String] =
         |   OptionT(List(Option(_.toString), None))
    scala> val fa: OptionT[List, Int] = OptionT(List(Option(1), Option(2)))
    scala> ff.ap(fa)
    res0: OptionT[List,String] = OptionT(List(Some(1), Some(2), None))
    scala> OptionT(ff.toNested.ap(fa.toNested).value)
    res1: OptionT[List,String] = OptionT(List(Some(1), Some(2), None, None))

42. def toRight[L](left: ⇒ L)(implicit F: Functor[F]): EitherT[F, L, A]

    

43. def transform[B](f: (Option[A]) ⇒ Option[B])(implicit F: Functor[F]): OptionT[F, B]

    

44. def traverse[G[_], B](f: (A) ⇒ G[B])(implicit F: Traverse[F], G: Applicative[G]): G[OptionT[F, B]]

    

45. val value: F[Option[A]]

    

46. final def wait(): Unit

    

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    @throws( ... )

47. final def wait(arg0: Long, arg1: Int): Unit

    

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    @throws( ... )

48. final def wait(arg0: Long): Unit

    

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    @throws( ... )

49. def withFilter(p: (A) ⇒ Boolean)(implicit F: Functor[F]): OptionT[F, A]