maxOf

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

inline fun <T> Sequence<T>.maxOf(selector: (T) -> Float): Float(source)

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

If any of values produced by selector function is NaN, the returned result is NaN.

The operation is terminal.

Since Kotlin

1.4

Throws

NoSuchElementException

if the sequence is empty.

Samples

import kotlin.math.*
import kotlin.test.*

fun main() { 
   //sampleStart 
   data class Rectangle(val width: Double, val height: Double) {
    val aspectRatio: Double get() = if (height != 0.0) width / height else Double.NaN
}

// The largest and smallest width-to-height ratios
val rectangles = listOf(
    Rectangle(15.0, 10.0),
    Rectangle(25.0, 20.0),
    Rectangle(40.0, 30.0),
)
println(rectangles.maxOf { it.aspectRatio }) // 1.5
println(rectangles.minOf { it.aspectRatio }) // 1.25

// Aspect ratio of a point (0.0 by 0.0) is NaN, hence the result is NaN
val rectanglesAndPoint = rectangles + Rectangle(0.0, 0.0)
println(rectanglesAndPoint.maxOf { it.aspectRatio }) // NaN
println(rectanglesAndPoint.minOf { it.aspectRatio }) // NaN

val emptyList = emptyList<Rectangle>()

// maxOf() and minOf() throw if the collection is empty
// emptyList.maxOf { it.aspectRatio } // will fail with NoSuchElementException
// emptyList.minOf { it.aspectRatio } // will fail with NoSuchElementException

// maxOfOrNull() and minOfOrNull() return null if the collection is empty
println(emptyList.maxOfOrNull { it.aspectRatio }) // null
println(emptyList.minOfOrNull { it.aspectRatio }) // null 
   //sampleEnd
}
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data class Rectangle(val width: Double, val height: Double) {
    val aspectRatio: Double get() = if (height != 0.0) width / height else Double.NaN
}
// The largest and smallest width-to-height ratios
val rectangles = listOf(
    Rectangle(15.0, 10.0),
    Rectangle(25.0, 20.0),
    Rectangle(40.0, 30.0),
)
println(rectangles.maxOf { it.aspectRatio }) // 1.5
println(rectangles.minOf { it.aspectRatio }) // 1.25
// Aspect ratio of a point (0.0 by 0.0) is NaN, hence the result is NaN
val rectanglesAndPoint = rectangles + Rectangle(0.0, 0.0)
println(rectanglesAndPoint.maxOf { it.aspectRatio }) // NaN
println(rectanglesAndPoint.minOf { it.aspectRatio }) // NaN
val emptyList = emptyList<Rectangle>()
// maxOf() and minOf() throw if the collection is empty
// emptyList.maxOf { it.aspectRatio } // will fail with NoSuchElementException
// emptyList.minOf { it.aspectRatio } // will fail with NoSuchElementException
// maxOfOrNull() and minOfOrNull() return null if the collection is empty
println(emptyList.maxOfOrNull { it.aspectRatio }) // null
println(emptyList.minOfOrNull { it.aspectRatio }) // null 
Open in Playground →
Target: JVMRunning on v.2.1.20

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