maxByOrNull

Common
JVM
JS
Native
1.4
inline fun < T , R : Comparable < R > > Array < out T > . maxByOrNull (
selector : ( T ) -> R
) : T ?

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inline fun < R : Comparable < R > > ByteArray . maxByOrNull (
selector : ( Byte ) -> R
) : Byte ?

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inline fun < R : Comparable < R > > ShortArray . maxByOrNull (
selector : ( Short ) -> R
) : Short ?

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inline fun < R : Comparable < R > > IntArray . maxByOrNull (
selector : ( Int ) -> R
) : Int ?

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inline fun < R : Comparable < R > > LongArray . maxByOrNull (
selector : ( Long ) -> R
) : Long ?

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inline fun < R : Comparable < R > > FloatArray . maxByOrNull (
selector : ( Float ) -> R
) : Float ?

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inline fun < R : Comparable < R > > DoubleArray . maxByOrNull (
selector : ( Double ) -> R
) : Double ?

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inline fun < R : Comparable < R > > BooleanArray . maxByOrNull (
selector : ( Boolean ) -> R
) : Boolean ?

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inline fun < R : Comparable < R > > CharArray . maxByOrNull (
selector : ( Char ) -> R
) : Char ?

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

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@ExperimentalUnsignedTypes inline fun < R : Comparable < R > > UIntArray . maxByOrNull (
selector : ( UInt ) -> R
) : UInt ?

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@ExperimentalUnsignedTypes inline fun < R : Comparable < R > > ULongArray . maxByOrNull (
selector : ( ULong ) -> R
) : ULong ?

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@ExperimentalUnsignedTypes inline fun < R : Comparable < R > > UByteArray . maxByOrNull (
selector : ( UByte ) -> R
) : UByte ?

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@ExperimentalUnsignedTypes inline fun < R : Comparable < R > > UShortArray . maxByOrNull (
selector : ( UShort ) -> R
) : UShort ?

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

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
}
Common
JVM
JS
Native
1.4
inline fun < K , V , R : Comparable < R > > Map < out K , V > . maxByOrNull (
selector : ( Entry < K , V > ) -> R
) : Entry < K , V > ?

(source)

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

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
}