What is the efficient way to modify a list in kotlin? for ex. From this list

mutableListOf(listOf(1,2,3,4,5), listOf(6,7,8,9,10))

I need this modified result but keeping original list as it is.

[[1,2], [6,7,8,9,10]]

in general getting a modified list from an existing list without changing the existing list is what you will get with all the classic Collection transformation operations: https://kotlinlang.org/docs/collection-transformations.html

Cay u try it:

val arr = mutableListOf(1, 2, 3, 4, 5)
val arr2 = listOf(6, 7, 8, 9, 10)
val arr4 = mutableListOf(arr.filterIndexed { index, _ -> index == 0 || index == 1 }, arr2)