nonFatalOrThrow

fun Throwable.nonFatalOrThrow(): Throwable(source)

Returns the Throwable if NonFatal and throws it otherwise.

Return

the Throwable this if NonFatal

import arrow.*
import arrow.core.*

fun unsafeFunction(i: Int): String =
   when (i) {
        1 -> throw IllegalArgumentException("Non-Fatal")
        2 -> throw OutOfMemoryError("Fatal")
        else -> "Hello"
   }

fun main(args: Array<String>) {
  val nonFatal: Either<Throwable, String> =
  //sampleStart
  try {
     Either.Right(unsafeFunction(1))
  } catch (t: Throwable) {
      Either.Left(t.nonFatalOrThrow())
  }
  //sampleEnd
  println(nonFatal)
}

Throws

Throwable

the Throwable this if Fatal