Adding value to arrays in scala

Question

I faced a problem where I needed to add a new value in the middle of an Array (i.e. make a copy of the original array and replace that with the new one). I successfully solved my problem, but I was wondering whether there were other methods to do this without changing the array to buffer for a while.

val original = Array(0, 1, 3, 4)
val parts = original.splitAt(2)
val modified = parts._1 ++ (2 +: parts._2)

res0: Array[Int] = Array(0, 1, 2, 3, 4)

What I don't like on my solution is the parts variable; I'd prefer not using an intermediate step like that. Is that the easiest way to add the value or is there some better ways to do add an element?

Answer 1

This is precisely what patch does:

val original = Array(0, 1, 3, 4)
original.patch(2, Array(2), 0)      // Array[Int] = Array(0, 1, 2, 3, 4)