Trait/Object

cats

Functor

Related Docs: object Functor | package cats

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trait Functor[F[_]] extends Invariant[F] with Serializable

Functor.

The name is short for "covariant functor".

Must obey the laws defined in cats.laws.FunctorLaws.

Self Type
Functor[F]
Linear Supertypes
Invariant[F], Serializable, Serializable, AnyRef, Any
Known Subclasses
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Inherited
  1. Functor
  2. Invariant
  3. Serializable
  4. Serializable
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Visibility
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Abstract Value Members

  1. abstract def map[A, B](fa: F[A])(f: (A) ⇒ B): F[B]

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Concrete Value Members

  1. final def !=(arg0: Any): Boolean

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    Definition Classes
    AnyRef → Any
  2. final def ##(): Int

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    Definition Classes
    AnyRef → Any
  3. final def ==(arg0: Any): Boolean

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    Definition Classes
    AnyRef → Any
  4. def as[A, B](fa: F[A], b: B): F[B]

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    Replaces the A value in F[A] with the supplied value.

  5. final def asInstanceOf[T0]: T0

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    Definition Classes
    Any
  6. def clone(): AnyRef

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    Attributes
    protected[java.lang]
    Definition Classes
    AnyRef
    Annotations
    @throws( ... )
  7. def compose[G[_]](implicit arg0: Functor[G]): Functor[[α]F[G[α]]]

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  8. def compose[G[_]](implicit arg0: Invariant[G]): Invariant[[α]F[G[α]]]

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    Definition Classes
    Invariant
  9. def composeContravariant[G[_]](implicit arg0: Contravariant[G]): Contravariant[[α]F[G[α]]]

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    Definition Classes
    FunctorInvariant
  10. def composeFunctor[G[_]](implicit arg0: Functor[G]): Invariant[[α]F[G[α]]]

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    Definition Classes
    Invariant
  11. final def eq(arg0: AnyRef): Boolean

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    Definition Classes
    AnyRef
  12. def equals(arg0: Any): Boolean

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    Definition Classes
    AnyRef → Any
  13. def finalize(): Unit

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    Attributes
    protected[java.lang]
    Definition Classes
    AnyRef
    Annotations
    @throws( classOf[java.lang.Throwable] )
  14. def fproduct[A, B](fa: F[A])(f: (A) ⇒ B): F[(A, B)]

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    Tuple the values in fa with the result of applying a function with the value

  15. final def getClass(): Class[_]

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    Definition Classes
    AnyRef → Any
  16. def hashCode(): Int

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    Definition Classes
    AnyRef → Any
  17. def imap[A, B](fa: F[A])(f: (A) ⇒ B)(g: (B) ⇒ A): F[B]

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    Definition Classes
    FunctorInvariant
  18. final def isInstanceOf[T0]: Boolean

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    Definition Classes
    Any
  19. def lift[A, B](f: (A) ⇒ B): (F[A]) ⇒ F[B]

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    Lift a function f to operate on Functors

  20. final def ne(arg0: AnyRef): Boolean

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    Definition Classes
    AnyRef
  21. final def notify(): Unit

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    Definition Classes
    AnyRef
  22. final def notifyAll(): Unit

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    Definition Classes
    AnyRef
  23. final def synchronized[T0](arg0: ⇒ T0): T0

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    Definition Classes
    AnyRef
  24. def toString(): String

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    Definition Classes
    AnyRef → Any
  25. def tupleLeft[A, B](fa: F[A], b: B): F[(B, A)]

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    Tuples the A value in F[A] with the supplied B value, with the B value on the left.

  26. def tupleRight[A, B](fa: F[A], b: B): F[(A, B)]

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    Tuples the A value in F[A] with the supplied B value, with the B value on the right.

  27. def void[A](fa: F[A]): F[Unit]

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    Empty the fa of the values, preserving the structure

  28. final def wait(): Unit

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

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    Definition Classes
    AnyRef
    Annotations
    @throws( ... )
  30. final def wait(arg0: Long): Unit

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    Definition Classes
    AnyRef
    Annotations
    @throws( ... )
  31. def widen[A, B >: A](fa: F[A]): F[B]

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    Lifts natural subtyping covariance of covariant Functors.

    Lifts natural subtyping covariance of covariant Functors.

    NOTE: In certain (perhaps contrived) situations that rely on universal equality this can result in a ClassCastException, because it is implemented as a type cast. It could be implemented as map(identity), but according to the functor laws, that should be equal to fa, and a type cast is often much more performant. See this example of widen creating a ClassCastException.

Inherited from Invariant[F]

Inherited from Serializable

Inherited from Serializable

Inherited from AnyRef

Inherited from Any

Ungrouped