kotlin-stdlib/kotlin.text/minByOrNull

minByOrNull

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

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 kotlin.test.*

fun main() { 
   //sampleStart 
   val list = listOf("abcd", "abc", "ab", "abcde")
val shortestString = list.minByOrNull { it.length }
println(shortestString) // ab

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