scalaz

Optional

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

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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: AnyRef): Boolean

    Definition Classes
    AnyRef
  2. final def !=(arg0: Any): Boolean

    Definition Classes
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  3. final def ##(): Int

    Definition Classes
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  4. final def ==(arg0: AnyRef): Boolean

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

    Definition Classes
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  6. def ?[A, X](fa: F[A])(some: ⇒ X, none: ⇒ X): X

    Returns some if this context is defined, otherwise none.

  7. final def asInstanceOf[T0]: T0

    Definition Classes
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  8. def clone(): AnyRef

    Attributes
    protected[java.lang]
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    @throws( ... )
  9. final def eq(arg0: AnyRef): Boolean

    Definition Classes
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  10. def equals(arg0: Any): Boolean

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  11. def finalize(): Unit

    Attributes
    protected[java.lang]
    Definition Classes
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    @throws( classOf[java.lang.Throwable] )
  12. final def getClass(): Class[_]

    Definition Classes
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  13. def getOrElse[A](fa: F[A])(default: ⇒ A): A

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

  14. def hashCode(): Int

    Definition Classes
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  15. def isDefined[A](fa: F[A]): Boolean

    Returns true if a value is defined within the context.

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

    Returns true if no value is defined within the context.

  17. final def isInstanceOf[T0]: Boolean

    Definition Classes
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  18. final def ne(arg0: AnyRef): Boolean

    Definition Classes
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  19. 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.

  20. final def notify(): Unit

    Definition Classes
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  21. final def notifyAll(): Unit

    Definition Classes
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  22. val optionalSyntax: OptionalSyntax[F]

  23. 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.

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

    Definition Classes
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  25. def toMaybe[A](fa: F[A]): Maybe[A]

    Returns this context converted to the Maybe context.

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

    Returns this context converted to the Option context.

  27. def toString(): String

    Definition Classes
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  28. final def wait(): Unit

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    @throws( ... )
  29. final def wait(arg0: Long, arg1: Int): Unit

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    @throws( ... )
  30. final def wait(arg0: Long): Unit

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    @throws( ... )

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