object option extends OptionOptics

Source
Option.scala
Linear Supertypes
OptionOptics, AnyRef, Any
Ordering
  1. Alphabetic
  2. By Inheritance
Inherited
  1. option
  2. OptionOptics
  3. AnyRef
  4. Any
  1. Hide All
  2. Show All
Visibility
  1. Public
  2. Protected

Value Members

  1. final def none[A]: Prism[Option[A], Unit]
    Definition Classes
    OptionOptics
  2. final def optionToDisjunction[A]: Iso[Option[A], Either[Unit, A]]
    Definition Classes
    OptionOptics
  3. final def pOptionToDisjunction[A, B]: PIso[Option[A], Option[B], Either[Unit, A], Either[Unit, B]]
    Definition Classes
    OptionOptics
  4. final def pSome[A, B]: PPrism[Option[A], Option[B], A, B]
    Definition Classes
    OptionOptics
  5. final def some[A]: Prism[Option[A], A]
    Definition Classes
    OptionOptics
  6. final def withDefault[A](defaultValue: A): Iso[Option[A], A]

    Creates an Iso that maps None to defaultValue and inversely.

    Creates an Iso that maps None to defaultValue and inversely.

    val defaultTo0 = withDefault(0)
defaultTo0.get(None) == 0
defaultTo0.get(Some(1)) == 1
defaultTo0.reverseGet(0) == None
defaultTo0.reverseGet(1) == Some(1)

    withDefault is a valid Iso only if we consider the set of A without defaultValue. For example, Some(0) breaks the round-trip property of Iso:

    defaultTo0.reverseGet(defaultTo0.get(Some(0))) == None
    Definition Classes
    OptionOptics
    See also

    This method is called non in Haskell Lens.