redeem

fun <B> redeem(fe: (Throwable) -> B, fb: (A) -> B): IO<B>

Redeem an IO to an IO of B by resolving the error or mapping the value A to B.

import arrow.fx.IO

fun main(args: Array<String>) {
  val result =
  //sampleStart
  IO.raiseError<Int>(RuntimeException("Hello from Error"))
    .redeem({ e -> e.message ?: "" }, Int::toString)
  //sampleEnd
  println(result.unsafeRunSync())
}