How to skip optional parameters in Scala?

Question

Given the following function with optional parameters:

def foo(a:Int = 1, b:Int = 2, c:Int = 3) ...

I want to keep the default value of a

Answer 1

You can create another function, with one of the parameters applied.

def long(a: Int = 1, b: Int = 2, c: Int = 3) = a + b + c

def short(x: Int, y: Int) = long(b = x, c = y)

val s = short(10, 20) // s: Int = 31