Pipes

A pipe function takes a T value and invokes a (T) -> R function with it:

import arrow.syntax.function.pipe

fun main(args: Array<String>) {
    val strong: (String) -> String = { body -> "<strong>$body</strong>" }

   "From a pipe".pipe(strong).pipe(::println)
}

A pipe is similar to function composition, but instead of generating new functions, we can chain function invocations to produce new values, reducing nesting calls. Pipes are known in other languages, such as Elm and Ocaml, as the operator |>:

fun main(args: Array<String>) {
   splitter(filterBills(calculatePrice(Quote(20.0, "Foo", "Shoes", 1)))) //Nested

   Quote(20.0, "Foo", "Shoes", 1) pipe ::calculatePrice pipe ::filterBills pipe ::splitter //Pipe
}

Both lines are equivalent, but the first one must be understood backwards and the second one should read from left to right:

import arrow.syntax.function.pipe
import arrow.syntax.function.pipe3
import arrow.syntax.function.reverse

fun main(args...