禁止显示“丢弃的非单位值”。警告 [英] Suppress "discarded non-Unit value" warning

问题描述

我已在我的构建中添加了scalac命令行参数 -Ywarn-value-discard ，因为这会捕获我在代码中发现的一个细微错误。但是，我现在收到有关丢弃的非单位值的警告，这些警告与故意丢弃而不是错误有关。我该如何禁止这些警告？

I have added the scalac command line argument -Ywarn-value-discard to my build because this would have caught a subtle bug that I just found in my code. However, I now get some warnings for "discarded non-Unit value" that are about intentional discards, not bugs. How do I suppress those warnings?

推荐答案

您可以通过明确返回单位（即（ ））。
例如，将其变为：

You suppress these warning by explictly returning unit (that is ()). By example turn this:

def method1() = {
   println("Hello")
   "Bye"
}
def method2() {
  method1() // Returns "Bye", which is implicitly discarded
}

进入：

def method1() = {
   println("Hello")
   "Bye"
}
def method2() {
  method1()
  () // Explicitly return unit
}

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