Created
December 2, 2018 09:16
-
-
Save PavelZaytsev/80459ff617df60461c0a4be9d29ac85a to your computer and use it in GitHub Desktop.
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
case class Reader[E, A](run: E => A) | |
object Reader { | |
def andThen[E, A, B, C](fa: A => Reader[E, B], | |
fb: B => Reader[E, C]): A => Reader[E, C] = { | |
input: A => | |
val readerB: Reader[E, B] = fa(input) | |
Reader { x => | |
val readerBResult: B = readerB.run(x) | |
fb(readerBResult).run(x) | |
} | |
} | |
def run[E, A]: Reader[E, A] => E => A = { | |
case Reader(runnable) => | |
e => | |
runnable(e) | |
} | |
def map[A, B, E](ra: Reader[E, A])(f: A => B): Reader[E, B] = { | |
Reader(_ => f(ra.run())) | |
} | |
def pure[E, A](a: A): Reader[E, A] = Reader(e => a) | |
} |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment