Replace element in List with scala

Question

How do you replace an element by index with an immutable List.

E.g.

val list = 1 :: 2 ::3 :: 4 :: List()

list.replace(2, 5)

Answer 1

It can also be achieved using patch function as

scala> var l = List(11,20,24,31,35)

l: List[Int] = List(11, 20, 24, 31, 35)

scala> l.patch(2,List(27),1)

res35: List[Int] = List(11, 20, 27, 31, 35)

where 2 is the position where we are looking to add the value, List(27) is the value we are adding to the list and 1 is the number of elements to be replaced from the original list.