minByOrNull

inline fun <R : Comparable<R>> CharSequence.minByOrNull(selector: (Char) -> R): Char?

Returns the first character yielding the smallest value of the given function or null if there are no characters.

Since Kotlin

1.4

Samples

import samples.*
import kotlin.test.*
fun main() { 
   //sampleStart 
   val list = listOf("abcd", "abc", "ab", "abcde")
val shortestString = list.minByOrNull { it.length }
assertPrints(shortestString, "ab")

val emptyList = emptyList<String>()
val emptyMin = emptyList.minByOrNull { it.length }
assertPrints(emptyMin, "null") 
   //sampleEnd
}