How to filter a list in-place with Kotlin?

Question

In Java I can remove items from a list with this code:

private void filterList(List items) {
    Iterator iterator = items.iterator();
           


        

Answer 1

This will remove even numbers from the list 1-9, and prints [1, 3, 5, 7, 9]

var myLists = mutableListOf(1,2,3,4,5,6,7,8,9)
myLists.removeAll{ it % 2 == 0 }
println(myLists)

This will retain even numbers and remove others from the list 1-9, and prints [2, 4, 6, 8]

myLists = mutableListOf(1,2,3,4,5,6,7,8,9)
myLists.retainAll{ it % 2 == 0 }
println(myLists)

Try them in https://play.kotlinlang.org/