Kotlin default arguments: forbid zero arguments calls

Question

In my project I have a function like this:

fun doCoolStuff(arg1: Int = 0, arg2: String? = null) {
}

Which I want it to use it in following cases:

obj.doCoolStuff(101) // only first argument provided
obj.doCoolStuff("102") // only second argument provided
obj.doCoolStuff(103, "104") // both arguments provided

But not in this one:

obj.doCoolStuff() // illegal case, should not be able to call the function like this

How do I achieve this on the syntax level?

Answer 1

There is no syntax in Kotlin that would allow you to accomplish what you need. Use overloaded functions (I'd use two, one for each required argument):

fun doCoolStuff(arg1: Int, arg2: String? = null) { ... }
fun doCoolStuff(arg2: String?) { doCoolStuff(defaultIntValue(), arg2) }