arrow-core-data / arrow.core / AndThen / compose

compose

infix fun <C> compose(g: (C) -> A): AndThen<C, B>

Compose a function to be invoked before the current function is invoked.

import arrow.core.AndThen

fun main(args: Array<String>) {
  //sampleStart
  val f = (0..10000).fold(AndThen { i: Int -> i + 1 }) { acc, _ ->
    acc.compose { it + 1 }
  }

  val result = f(0)
  //sampleEnd
  println("result = $result")
}

Parameters

g - function to invoke before invoking this function with the result.

Return a composed AndThen function that first applies g to its input, and then applies this function to the result.