i need review for my code ```val carMst: List<(Mutable)Map<String!, Any!>!>! val carUser...

# codereview

[Tuang]

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

[Shawn]

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

[Shawn]

is if (carMst["car_id"] == uids["car_id"]) supposed to be if (mst["car_id"] == uids["car_id"])? carMst is a list here and cannot be accessed using a string

[Shawn]

I’m not sure if this snippet even compiles tbh

[Shawn]

the implied data model here seems complex and hard to advise on over the internet not gonna lie

[Shawn]

I’m not saying there’s guaranteed to be a better than O(mn) solution here, but there very well might be one

[Shawn]

the usage of as here is also pretty sus

[Tuang]

thank you