Dart vs Kotlin: nullability operators

nullability.dart

void main() {
  int? nullableNumber = 1;
  int number = nullableNumber!;
  List<int>? myList; // null
  print(myList?.length ?? 0); // 0
  myList ??= [1, 2, 3];
  print(myList.length); // 3
}

nullability.kt

fun main() {
    val nullableNumber: Int? = 1
    val number = nullableNumber!!
    var myList: List<Int>? = null
    println(myList?.size ?: 0) // 0
    myList = myList ?: listOf(1, 2, 3)
    println(myList.size) // 3
}