reverseOrder

Returns a comparator that compares Comparable objects in reversed natural order.

fun <T : Comparable<T>> reverseOrder(): Comparator<T>(source)
import kotlin.comparisons.reverseOrder

fun main() {
    val numbers = listOf(3, 1, 4, 1, 5)
    val sortedNumbers = numbers.sortedWith(reverseOrder())
    println(sortedNumbers)   // Output: [5, 4, 3, 1, 1]

    val words = listOf("apple", "banana", "cherry")
    val sortedWords = words.sortedWith(reverseOrder())
    println(sortedWords)     // Output: [cherry, banana, apple]
}

Source