maxOf

Returns the largest value among all values produced by selector function applied to each element in the array.

inline fun <T> Array<out T>.maxOf(selector: (T) -> Double): Double(source)

data class Person(val name: String, val height: Double)

val people = arrayOf(
    Person("Alice", 1.65),
    Person("Bob", 1.82),
    Person("Charlie", 1.75)
)

val tallestHeight = people.maxOf { it.height }
println("Tallest height: $tallestHeight")

Source