Elvis operator in Kotlin

Elvis.kt

fun main(args: Array<String>) {
    val arnav = Person();
    println(arnav);
    arnav.name = "Arnav Kale";
    println(arnav);
}

class Person {
    var name: String? = null
    override fun toString(): String {
        var derievedName: String = this.name ?: "Unknown";
        return "My name is $derievedName";
    }
}