CASE_INSENSITIVE_ORDER

A Comparator that orders strings ignoring character case.

expect val String.Companion.CASE_INSENSITIVE_ORDER: Comparator<String>(source)

import kotlin.text.String.Companion.CASE_INSENSITIVE_ORDER

fun main() {
    val names = listOf("banana", "Apple", "cherry", "apple", "Banana")

    val sorted = names.sortedWith(CASE_INSENSITIVE_ORDER)
    println(sorted) // [Apple, apple, banana, Banana, cherry]
}

Source