Test @ komoot

scratch.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)
    )
    
    // Write kotlin code to print the top sport by distance excluding eBikes.
    /**
     * Solution Arguments:
     * 1. inline = No need to store a variable since we won't use the value again
     * 2. predicate inside maxByOrNull = avoid iterating twice over the list
     * 3. takeIf = more concise than if/else, because unfortunately, Kotlin has no ternary operator
     */
    println(
        sportStats
            .maxByOrNull { it.distance.takeIf { _ -> it.sport != Sport.E_TOURING_BICYCLE } ?: 0 }
            ?.sport
    )
}