UnitVSBoolean.scala

def mySideEffect(i:Int ):Boolean = {
  try {
    //do something with i
    if (scala.util.Random.nextBoolean) {
      throw new Exception("Ooops")
    }
  } catch {
    case _: Throwable => return false
  }
  return true
}

def yourSideEffect(i:Int ):Unit = {
  try {
    //do something with i
    if (scala.util.Random.nextBoolean) {
      throw new Exception("Ooops")
    }
  } catch {
    case _: Throwable => println("Something failed, good luck fixing it")
  }
}

println( (1 to 10 map mySideEffect) )

println( (1 to 10 map yourSideEffect) )


/*
output:

Desktop → scala UnitVSBoolean.scala
Vector(true, true, true, false, false, true, true, false, false, false)
Something failed, good luck fixing it
Something failed, good luck fixing it
Something failed, good luck fixing it
Something failed, good luck fixing it
Something failed, good luck fixing it
Vector((), (), (), (), (), (), (), (), (), ())
*/