如何在kotlin中根据升序映射数组列表和排序

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();