Question

I’d like to have a Scala functions that returns the reference to another function, is that possible?

Answer 1

You can return a function type (this is defined by A => B). In this case Int to Int:

scala> def f(x:Int): Int => Int =  { n:Int => x + n }
f: (x: Int)(Int) => Int

When you call the function you get a new function.

scala> f(2)
res1: (Int) => Int = <function1>

Which can be called as a normal function:

scala> res1(3)
res2: Int = 5