How to Map Array list and sort based on ascendencing order in kotlin

Question

How to transform these values in an array list and sort it based on descending order using a single function

var a =[1,2,3]

Each value in the list should be multiplied by 3

ExpectedResult=[9,4,3]

Answer 1

It should be as simple as this

var a = listOf(1, 2, 3);
var expectedResult = a.map { it -> it * 3 }.sortedDescending();