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
Linear Supertypes
Known Subclasses
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Abstract Value Members
Concrete Value Members
- final def !=(arg0: Any): Boolean
- Definition Classes
- AnyRef → Any
- final def ##(): Int
- Definition Classes
- AnyRef → Any
- final def ==(arg0: Any): Boolean
- Definition Classes
- AnyRef → Any
- def ?[A, X](fa: F[A])(some: => X, none: => X): X
Returns
someif this context is defined, otherwisenone. - final def asInstanceOf[T0]: T0
- Definition Classes
- Any
- def clone(): AnyRef
- Attributes
- protected[lang]
- Definition Classes
- AnyRef
- Annotations
- @throws(classOf[java.lang.CloneNotSupportedException]) @native()
- final def eq(arg0: AnyRef): Boolean
- Definition Classes
- AnyRef
- def equals(arg0: AnyRef): Boolean
- Definition Classes
- AnyRef → Any
- def finalize(): Unit
- Attributes
- protected[lang]
- Definition Classes
- AnyRef
- Annotations
- @throws(classOf[java.lang.Throwable])
- final def getClass(): Class[_ <: AnyRef]
- Definition Classes
- AnyRef → Any
- Annotations
- @native()
- def getOrElse[A](fa: F[A])(default: => A): A
Returns the value within the context if defined or else the value of
default. - def hashCode(): Int
- Definition Classes
- AnyRef → Any
- Annotations
- @native()
- def isDefined[A](fa: F[A]): Boolean
Returns
trueif a value is defined within the context. - final def isEmpty[A](fa: F[A]): Boolean
Returns
trueif no value is defined within the context. - final def isInstanceOf[T0]: Boolean
- Definition Classes
- Any
- final def ne(arg0: AnyRef): Boolean
- Definition Classes
- AnyRef
- final def nonEmpty[A](fa: F[A]): Boolean
Returns
trueif a value is defined within the context.Returns
trueif a value is defined within the context. This is an alias forisDefined. - final def notify(): Unit
- Definition Classes
- AnyRef
- Annotations
- @native()
- final def notifyAll(): Unit
- Definition Classes
- AnyRef
- Annotations
- @native()
- val optionalSyntax: OptionalSyntax[F]
- 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. - final def synchronized[T0](arg0: => T0): T0
- Definition Classes
- AnyRef
- def toMaybe[A](fa: F[A]): Maybe[A]
Returns this context converted to the
Maybecontext. - def toOption[A](fa: F[A]): Option[A]
Returns this context converted to the
Optioncontext. - def toString(): String
- Definition Classes
- AnyRef → Any
- final def wait(): Unit
- Definition Classes
- AnyRef
- Annotations
- @throws(classOf[java.lang.InterruptedException])
- final def wait(arg0: Long, arg1: Int): Unit
- Definition Classes
- AnyRef
- Annotations
- @throws(classOf[java.lang.InterruptedException])
- final def wait(arg0: Long): Unit
- Definition Classes
- AnyRef
- Annotations
- @throws(classOf[java.lang.InterruptedException]) @native()