pimsl is a small utility library for Scala.
pimsl offers a limited implementation of John Hughes' Arrows in Scala, including compatibility with sequence comprehensions in a way that imitates Haskell's proc notation:
scala> import pimsl.Arrow._
import pimsl.Arrow._
scala> val addOne: Int => Int = a => a + 1
addOne: Int => Int = <function1>
scala> val addTwo: Int => Int = a => a + 2
addOne: Int => Int = <function1>
scala> :paste
// Entering paste mode (ctrl-D to finish)
val proc: Int => Int = x => for {
y <- addOne -< x
z <- addTwo -< x
} yield y + z
// Exiting paste mode, now interpreting.
proc: Int => Int = <function1>
scala> proc(0)
res0: Int = 3Author