object
FunctorUsage 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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def
clone(): AnyRef
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val
executionStart: Long
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def
finalize(): Unit
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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
len: (String) ⇒ Int
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val
listOpt: Functor[[α]List[Option[α]]]
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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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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 Functor is a ubiquitous typeclass involving type constructors of kind * → *, which is another way of saying types that have a single type variable. Examples might be Option, List, Future.
The Functor category involves a single operation, named
map:def map[A, B](fa: F[A])(f: A => B): F[B]
This method takes a Function from A => B and turns an F[A] into an F[B]