如何在 Scala 中模式匹配多个值？
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How to pattern match multiple values in Scala?
提问by Fran?ois Beausoleil
Let's say I want to handle multiple return values from a remote service using the same code. I don't know how to express this in Scala:
假设我想使用相同的代码处理来自远程服务的多个返回值。我不知道如何在 Scala 中表达这一点：
code match {
case "1" => // Whatever
case "2" => // Same whatever
case "3" => // Ah, something different
}
I know I can use Extract Method and call that, but there's still repetition in the call. If I were using Ruby, I'd write it like this:
我知道我可以使用 Extract Method 并调用它，但是调用中仍然存在重复。如果我使用 Ruby，我会这样写：
case code
when "1", "2"
# Whatever
when "3"
# Ah, something different
end
Note that I simplified the example, thus I don't want to pattern match on regular expressions or some such. The match values are actually complex values.
请注意，我简化了示例，因此我不想对正则表达式等进行模式匹配。匹配值实际上是复杂的值。
回答by axel22
You can do:
你可以做：
code match {
case "1" | "2" => // whatever
case "3" =>
}
Note that you cannot bind parts of the pattern to names - you can't do this currently:
请注意，您不能将模式的一部分绑定到名称 - 目前您不能这样做：
code match {
case Left(x) | Right(x) =>
case null =>
}
