是否有转换函数的惯用方法
val x: A => (B, C) = ...
到
val y: A => (C, B) = ...
最佳答案
(B, C)到 (C, B)使用 Tuple2.swap . A => (B, C)成A => (C, B)然后可以使用 .andThen(_.swap) 完成. 例如 :
scala> val a = (i: Int) => (s"$i", i.toDouble)
a: Int => (String, Double) = <function1>
scala> val b = a.andThen(_.swap)
b: Int => (Double, String) = <function1>
scala> b(5)
res1: (Double, String) = (5.0,5)
关于scala - A => (B, C) 到 A => (C, B) 的惯用函数变换，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/32297222/