Packages

trait Optional[F[_]] extends AnyRef

Abstraction over a container/context which may or may not provide a value.

F

the container/context type

Self Type
Optional[F]
Source
Optional.scala
See also

syntax.OptionalOps

Linear Supertypes
AnyRef, Any
Known Subclasses
IsomorphismOptional
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Abstract Value Members

  1. abstract def pextract[B, A](fa: F[A]): \/[F[B], A]

    If fa has an a, return it; otherwise it must be universally quantified.

Concrete Value Members

  1. final def !=(arg0: Any): Boolean
    Definition Classes
    AnyRef → Any
  2. final def ##(): Int
    Definition Classes
    AnyRef → Any
  3. final def ==(arg0: Any): Boolean
    Definition Classes
    AnyRef → Any
  4. def ?[A, X](fa: F[A])(some: ⇒ X, none: ⇒ X): X

    Returns some if this context is defined, otherwise none.

  5. final def asInstanceOf[T0]: T0
    Definition Classes
    Any
  6. def clone(): AnyRef
    Attributes
    protected[java.lang]
    Definition Classes
    AnyRef
    Annotations
    @native() @throws( ... )
  7. final def eq(arg0: AnyRef): Boolean
    Definition Classes
    AnyRef
  8. def equals(arg0: Any): Boolean
    Definition Classes
    AnyRef → Any
  9. def finalize(): Unit
    Attributes
    protected[java.lang]
    Definition Classes
    AnyRef
    Annotations
    @throws( classOf[java.lang.Throwable] )
  10. final def getClass(): Class[_]
    Definition Classes
    AnyRef → Any
    Annotations
    @native()
  11. def getOrElse[A](fa: F[A])(default: ⇒ A): A

    Returns the value within the context if defined or else the value of default.

  12. def hashCode(): Int
    Definition Classes
    AnyRef → Any
    Annotations
    @native()
  13. def isDefined[A](fa: F[A]): Boolean

    Returns true if a value is defined within the context.

  14. final def isEmpty[A](fa: F[A]): Boolean

    Returns true if no value is defined within the context.

  15. final def isInstanceOf[T0]: Boolean
    Definition Classes
    Any
  16. final def ne(arg0: AnyRef): Boolean
    Definition Classes
    AnyRef
  17. final def nonEmpty[A](fa: F[A]): Boolean

    Returns true if a value is defined within the context.

    Returns true if a value is defined within the context. This is an alias for isDefined.

  18. final def notify(): Unit
    Definition Classes
    AnyRef
    Annotations
    @native()
  19. final def notifyAll(): Unit
    Definition Classes
    AnyRef
    Annotations
    @native()
  20. val optionalSyntax: OptionalSyntax[F]
  21. def orElse[A](fa: F[A])(alternative: ⇒ F[A]): F[A]

    Returns given context if it is defined or else the value of the alternative.

  22. final def synchronized[T0](arg0: ⇒ T0): T0
    Definition Classes
    AnyRef
  23. def toMaybe[A](fa: F[A]): Maybe[A]

    Returns this context converted to the Maybe context.

  24. def toOption[A](fa: F[A]): Option[A]

    Returns this context converted to the Option context.

  25. def toString(): String
    Definition Classes
    AnyRef → Any
  26. final def wait(): Unit
    Definition Classes
    AnyRef
    Annotations
    @throws( ... )
  27. final def wait(arg0: Long, arg1: Int): Unit
    Definition Classes
    AnyRef
    Annotations
    @throws( ... )
  28. final def wait(arg0: Long): Unit
    Definition Classes
    AnyRef
    Annotations
    @native() @throws( ... )

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