怎么样:

scala> (a _).tupled(b)
res0: Int = 3

• a 是一种方法.a _ 给你一个部分应用的函数.
• Function2.tupled 根据您的函数创建一个元组版本.
• a is a method. a _ gives you a partially applied function.
• Function2.tupled creates a tupled version from your function.