Hello, Im looking for a way to clean this code. I dont like this part of init empty String, is there other way write this?

fun getStreetNameByStreetId(id: String): String {
        val query = Query()
        query.fields().include("name")
        query.addCriteria(Criteria.where("_id").`is`(id))
        var streetName = ""
        mongoTemplate.executeQuery(
            query, STREET_COLLECTION
        ) { document: Document ->
            streetName = document.getValue("name").toString()
        }
        return streetName
    }

I don't know the MongoTemplate API, is this call synchronous or asynchronous? Is the callback guaranteed to be called in-place once? At least once? It looks like an asynchronous call but maybe it's not, I guess it depends on the flavor of mongoDB lib you're using. If it is asynchronous, the code here shouldn't even work because

streetName

might not be updated before you return from the enclosing function.

Please don’t cross-post, thank you https://kotlinlang.slack.com/archives/C1H43FDRB/p1632862066064000