Scala underscore minimal function

Question

Let\'s create a value for the sake of this question:

val a = 1 :: Nil

now, I can demonstrate that the anonymous functions can be written in

Answer 1

Your first shorthand form can also be written point-free

a map (2*)

Thanks to multiplication being commutative.

As for (x) => x, you want the identity function. This is defined in Predef and is generic, so you can be sure that it's type-safe.