Why doesn't Function2 have an andThen method?

Question

Why does andThen only exist for single argument functions in Scala?

The following code works:

val double = (x: Int) => x * 2
val timesFou         


        

Answer 1

I can't speak as to why Function2 doesn't supply and andThen, but Scalaz defines Functor instances for functions of various arities where map is equivalent to andThen, meaning you could write

val multiplyAndDouble = multiply map double