匹配“fallthrough":为多个案例执行同一段代码? [英] Match "fallthrough": executing same piece of code for more than one case?

问题描述

Scala 的编写以下代码的方式是什么:

What is the Scala's way to write the following code:

 int i;

 switch(i) {
   case 1:  
         a();
         break;

   case 2:
   case 15:
        b();
        c();
        break;

   default: foo()        
 } 

即基于多个案例值执行同一段代码的惯用方法是什么?

I.e. what is the idiomatic way of executing the same piece of code based on multiple case values?

 i match {
   case 1  => a    
   case 2  =>
   case 15 => { b
                c }
   case _ => foo        
 } 

似乎不太合适，因为 Scala 根据第一个匹配情况评估匹配值，即如果 i=2，代码将不返回任何内容.

Doesn't quite seem do the trick, since Scala evaluates the match value based on the first matching case, i.e. if i=2 the code will return nothing.

感谢您的帮助！

推荐答案

根据 本次对话没有落差，但您可以使用|.

According to this conversation there is no fallthrough, but you can make use of |.

这应该可以解决问题:

i match {
  case 1  => a    
  case 2 | 15 => b
                 c
  case _ => foo        
} 

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