Komoot's task

Komoot.kt

enum class Sport { HIKE, RUN, TOURING_BICYCLE, E_TOURING_BICYCLE }

data class Summary(val sport: Sport, val distance: Int)

fun main() {
    val sportStats = listOf(
        Summary(Sport.HIKE, 92),
        Summary(Sport.RUN, 77),
        Summary(Sport.TOURING_BICYCLE, 322),
        Summary(Sport.E_TOURING_BICYCLE, 656)
    )

    val topDistanceSport = sportStats.filter { it.sport != Sport.E_TOURING_BICYCLE }.maxByOrNull {
        it.distance
    }
    println(topDistanceSport?.sport?.name ?: "The list is empty")
}

The sportStats is a list, so we have some predefined functions on it like filter.
This part of the code sportStats.filter { it.sport != Sport.E_TOURING_BICYCLE } is filtering the results to exclude the eBikes stats and give us a list of all the items except eBikes. Now, we can get the top distance by using the maxByOrNull function. It will compare all the distances of the new list and return the item with the top distance, and if the list is empty, it will return null. There used to be a function called maxBy, but it is now deprecated and also not safe to use.
Then, in the last line, we check if the is not null, it will print the item's sport name, otherwise, it will print The list is empty