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 .
import kotlin.test.*
fun main(args: Array<String>) {
//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
}