Quicksort Implementation in Scala

Quicksort

def quickSort(xs: Array[Int]) : Array[Int] = {
	if(xs.length <= 1) xs
	else {
		val pivot = xs(xs.length / 2)
		Array.concat(
			quickSort(xs filter (pivot >)),
			xs filter( pivot == ),
			quickSort(xs filter (pivot <))
		)
	}
}