scalaz

Functor

trait Functor[F[_]] extends AnyRef

Functors, covariant by nature if not by Scala type. Their key operation is map, whose behavior is constrained only by type and the functor laws.

Many useful functors also have natural scalaz.Apply or scalaz.Bind operations. Many also support scalaz.Traverse.

Self Type
Functor[F]
Source
Functor.scala
See also

scalaz.Functor.FunctorLaw

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Type Members

  1. trait FunctorLaw extends AnyRef

Abstract Value Members

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

    Lift f into F and apply to F[A].

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

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

    Definition Classes
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  6. def apply[A, B](fa: F[A])(f: (A) ⇒ B): F[B]

    Alias for map.

  7. final def asInstanceOf[T0]: T0

    Definition Classes
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  8. def clone(): AnyRef

    Attributes
    protected[java.lang]
    Definition Classes
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    Annotations
    @throws( ... )
  9. def compose[G[_]](implicit G0: Functor[G]): Functor[[α]F[G[α]]]

    The composition of Functors F and G, [x]F[G[x]], is a Functor

  10. def counzip[A, B](a: \/[F[A], F[B]]): F[\/[A, B]]

  11. final def eq(arg0: AnyRef): Boolean

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

    Definition Classes
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  13. def finalize(): Unit

    Attributes
    protected[java.lang]
    Definition Classes
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    Annotations
    @throws( classOf[java.lang.Throwable] )
  14. def fpair[A](fa: F[A]): F[(A, A)]

    Twin all As in fa.

  15. def fproduct[A, B](fa: F[A])(f: (A) ⇒ B): F[(A, B)]

    Pair all As in fa with the result of function application.

  16. def functorLaw: FunctorLaw

  17. val functorSyntax: FunctorSyntax[F]

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

    Definition Classes
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  19. def hashCode(): Int

    Definition Classes
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  20. final def isInstanceOf[T0]: Boolean

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

    Lift f into F.

  22. def mapply[A, B](a: A)(f: F[(A) ⇒ B]): F[B]

    Lift apply(a), and apply the result to f.

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

    Definition Classes
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  24. final def notify(): Unit

    Definition Classes
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  25. final def notifyAll(): Unit

    Definition Classes
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  26. def product[G[_]](implicit G0: Functor[G]): Functor[[α](F[α], G[α])]

    The product of Functors F and G, [x](F[x], G[x]]), is a Functor

  27. def strengthL[A, B](a: A, f: F[B]): F[(A, B)]

    Inject a to the left of Bs in f.

  28. def strengthR[A, B](f: F[A], b: B): F[(A, B)]

    Inject b to the right of As in f.

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

    Definition Classes
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  30. def toString(): String

    Definition Classes
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  31. def void[A](fa: F[A]): F[Unit]

    Empty fa of meaningful pure values, preserving its structure.

  32. final def wait(): Unit

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

    Definition Classes
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    @throws( ... )
  34. final def wait(arg0: Long): Unit

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    @throws( ... )

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