kotlin-stdlib/kotlin.sequences/maxByOrNull

maxByOrNull

inline fun <T, R : Comparable<R>> Sequence<T>.maxByOrNull(selector: (T) -> R): T?(source)

Returns the first element yielding the largest value of the given function or null if there are no elements.

The operation is terminal.

Since Kotlin

1.4

Samples

import kotlin.test.*

fun main() { 
   //sampleStart 
   val nameToAge = listOf("Alice" to 42, "Bob" to 28, "Carol" to 51)
val oldestPerson = nameToAge.maxByOrNull { it.second }
println(oldestPerson) // (Carol, 51)

val emptyList = emptyList<Pair<String, Int>>()
val emptyMax = emptyList.maxByOrNull { it.second }
println(emptyMax) // null 
   //sampleEnd
}