在try / catch塊中最終“超出范圍”

Question

有沒有辦法訪問在finally塊中的try / catch塊中創建的val？ 或者是最終塊超出范圍。

def myTryCatch: Either[Exception, String] = {
  try {
    val w = runOrFailWithException("Please work...")
    Right(w)
  } catch {
    case ex: Exception => {
      Left(ex)
    }
  }
  finally {
    // How do I get access to Left or Right in my finally block.
    // This does not work
    _ match {
      case Right(_) =>
      case Left(_) =>
    }
  }
}

Answer 1

為什么你需要在finally塊中執行此操作？ 由於try/catch是一個表達式，因此您可以匹配其值：

try {
  val w = runOrFailWithException("Please work...")
  Right(w)
} catch {
  case ex: Exception => Left(ex)
} match {
  case Right(_) =>
  case Left(_) =>
}