在try/catch块中终于“超出范围”

Question

有没有方法可以访问finally块中的try/catch块中创建的val？或者是最终阻止了范围。

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

为什么您需要在finally块中执行此操作？由于try/catch是一个表达式，你可以匹配其值：

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