i need review for my code

val carMst: List<(Mutable)Map<String!, Any!>!>!
val carUserIds: List<(Mutable)Map<String!, Any!>!>!
....
....
val result = ArrayList<Car>()
for (mst in carMst) {
    val userIds = ArrayList<Int>()
    for (uids in carUserIds) {
        if (mst["car_id"] == uids["car_id"]) {
            userIds.add(uids["user_id"] as Int)
        }
    }
    val car = Car(
        mst["car_id"] as Int,
        mst["model"] as String,
        userIds
    )
    result.add(car)
}

i dont know too much about collection and lambda but with collection this can be more simple and beautiful right? 😀 thanks

is each

Map<String, Any>

representative of some kind of

Car

-related record stored somewhere? You should consider migrating from weakly-typed maps to something more explicit and harder to coerce improperly

thank you