Scala，如何访问整个匹配：X match {case Y(z) as match =>答案

【问题标题】：Scala, how to access the whole match: X match {case Y(z) as matched =>Scala，如何访问整个匹配：X match {case Y(z) as match =>
【发布时间】：2013-07-31 22:57:43
【问题描述】：

scala 中是否有语法或方法可以访问 case 语句中的整个匹配结构？

澄清一下，如果有“as”关键字，可以这样做：

x match {
  case Y(z) as matched =>
    // do stuff both with "matched" and "z" here ...
  ...
}

【问题讨论】：

Does Scala have a statement equivalent to ML's "as" statement?的可能重复

标签： scala pattern-matching case-class

【解决方案1】：

您应该能够使用@ 语法：

x match {
  case matched @ Y(z) =>
    // do stuff both with "matched" and "z" here ...
  ...
}

来自here

【讨论】：

这叫variable binding。