What is the correct way to get a subarray in Scala?

Question

I am trying to get a subarray in scala, and I am a little confused on what the proper way of doing it is. What I would like the most would be something like how you can do

Answer 1

An example of extracting specific columns from a 2D Scala Array (original_array):

import scala.collection.mutable.ArrayBuffer

val sub_array = ArrayBuffer[Array[String]]()
val columns_subset: Seq[String] = Seq("ColumnA", "ColumnB", "ColumnC")
val columns_original = original_array(0)

for (column_now <- columns_subset) {
      sub_array += original_array.map{_(columns_original.indexOf(column_now))}
    }
sub_array