Remove element at given index

Question

In Scala, I have an Array[Int] object called elem.

I would like to remove the element at index k.

I have tried this:

elem.filter(! _.equals(elem(k)))

However, this removes all elements which are equal to elem(k).

How could I remove only the element at the index k?

Answer 1

For all collections (you can view Array as such) you can use the immutable patch method that returns a new collection:

val xs = Seq(6, 5, 4, 3)
// replace one element at index 2 by an empty seq:
xs.patch(2, Nil, 1)  // List(6, 5, 3)

If you want a mutable collection, you might want to look at Buffer instead of Array.

val ys = collection.mutable.Buffer(6, 5, 4, 3)
ys.remove(2)
ys // ArrayBuffer(6, 5, 3)