minBy
inline fun <T, R : Comparable<R>> Sequence<T>.minBy(
selector: (T) -> R
): T?Returns the first element yielding the smallest 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 list = listOf("abcd", "abc", "ab", "abcde")
val shortestString = list.minBy { it.length }
println(shortestString) // ab
val emptyList = emptyList<String>()
val emptyMin = emptyList.minBy { it.length }
println(emptyMin) // null
//sampleEnd
}