object
BifunctorUsage extends App
Value Members
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final
def
!=(arg0: Any): Boolean
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final
def
##(): Int
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final
def
==(arg0: Any): Boolean
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def
args: Array[String]
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final
def
asInstanceOf[T0]: T0
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val
bff: Bifunctor[[α, β]List[\/[α, β]]]
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def
clone(): AnyRef
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val
executionStart: Long
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def
finalize(): Unit
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val
fourTwo: (Int, Int)
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final
def
getClass(): Class[_]
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def
hashCode(): Int
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final
def
isInstanceOf[T0]: Boolean
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val
leftF: Functor[[α$0$]\/[α$0$, String]]
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def
main(args: Array[String]): Unit
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final
def
notify(): Unit
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final
def
notifyAll(): Unit
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val
rightF: Functor[[β$1$]\/[String, β$1$]]
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val
strlen: (String) ⇒ Int
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final
def
synchronized[T0](arg0: ⇒ T0): T0
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def
toString(): String
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final
def
wait(): Unit
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final
def
wait(arg0: Long, arg1: Int): Unit
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final
def
wait(arg0: Long): Unit
Deprecated Value Members
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def
delayedInit(body: ⇒ Unit): Unit
A Bifunctor is very similar to a Functor, which you are hopefully already familiar with. Whereas a Functor operates on a * → * and has a single operation
mapwhich takes a function from A => B to map a F[A] to a F[B], a Bifunctor operates on a *,* → * and has a single operationbimapwhich takes two functions: A ⇒ C and a B ⇒ D to map a F[A,B] to a F[C,D]:def bimap[A, B, C, D](fab: F[A, B])(f: A => C, g: B => D): F[C, D]
some examples of common types for which we have Bifunctor instances are Either, Validation, \/, Tuple2