scala - 在 try/catch block 中最终是 "out of scope"

Question

有没有办法访问在 finally 块中的 try/catch 块中创建的 val ？或者是超出范围的 finally 块。

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

为什么需要在 finally 中执行此操作堵塞？自 try/catch是一个表达式，你可以匹配它的值:

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