attempt

fun attempt(): IO<Either<Throwable, A>>

Safely attempts the IO and lift any errors to the value side into Either.

import arrow.fx.IO

fun main(args: Array<String>) {
  //sampleStart
  val resultA = IO.raiseError<Int>(RuntimeException("Boom!")).attempt()
  val resultB = IO.just("Hello").attempt()
  //sampleEnd
  println("resultA: ${resultA.unsafeRunSync()}, resultB: ${resultB.unsafeRunSync()}")
}

See Also

flatMap