How do you type maps properly in Kotlin? I want to...

# getting-started

[Georg Ekeberg]

How do you type maps properly in Kotlin? I want to make a type that is a map with two required keys. tried using class, but I am at a loss.

abstract class GameState(i: Int, i1: Int) {
    abstract val pinsLeft: Int
    abstract val triesLeft: Int
}

fun roll(pinsDown: Int,
         pinsLeft: Int = 10,
         triesLeft: Int = 2): GameState {
    return mapOf(Pair("pinsLeft", pinsLeft - pinsDown), Pair("triesLeft", --triesLeft)
}