final case class Nested[F[_], G[_], A](value: F[G[A]]) extends Product with Serializable

Similar to cats.data.Tuple2K, but for nested composition.

For instance, since both List and Option have a Functor, then so does List[Option[_]]. This is represented by this data type via the instantiation Nested[List, Option, ?].

scala> import cats.Functor
scala> import cats.data.Nested
scala> import cats.implicits._
scala> val listOption: List[Option[Int]] = List(Some(1), None)
scala> val f: Int => String = i => (i * 2).toString
scala> Functor[List].map(listOption)(opt => opt.map(f))
res0: List[Option[String]] = List(Some(2), None)
scala> val nested: Nested[List, Option, Int] = Nested(listOption)
scala> val result: Nested[List, Option, String] = Functor[Nested[List, Option, ?]].map(nested)(f)
scala> result.value
res1: List[Option[String]] = List(Some(2), None)
Source
Nested.scala
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  1. Nested
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Instance Constructors

  1. new Nested(value: F[G[A]])

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
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  4. final def asInstanceOf[T0]: T0
    Definition Classes
    Any
  5. def clone(): AnyRef
    Attributes
    protected[java.lang]
    Definition Classes
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    @native() @throws( ... )
  6. final def eq(arg0: AnyRef): Boolean
    Definition Classes
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  7. def finalize(): Unit
    Attributes
    protected[java.lang]
    Definition Classes
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    @throws( classOf[java.lang.Throwable] )
  8. final def getClass(): Class[_]
    Definition Classes
    AnyRef → Any
    Annotations
    @native()
  9. final def isInstanceOf[T0]: Boolean
    Definition Classes
    Any
  10. def mapK[H[_]](f: ~>[F, H]): Nested[H, G, A]

    Modify the context F using transformation f.

  11. final def ne(arg0: AnyRef): Boolean
    Definition Classes
    AnyRef
  12. final def notify(): Unit
    Definition Classes
    AnyRef
    Annotations
    @native()
  13. final def notifyAll(): Unit
    Definition Classes
    AnyRef
    Annotations
    @native()
  14. final def synchronized[T0](arg0: ⇒ T0): T0
    Definition Classes
    AnyRef
  15. val value: F[G[A]]
  16. final def wait(): Unit
    Definition Classes
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    Annotations
    @throws( ... )
  17. final def wait(arg0: Long, arg1: Int): Unit
    Definition Classes
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    @throws( ... )
  18. final def wait(arg0: Long): Unit
    Definition Classes
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    @native() @throws( ... )

Inherited from Serializable

Inherited from Serializable

Inherited from Product

Inherited from Equals

Inherited from AnyRef

Inherited from Any

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