QuickSort in Scala

QuickSort.scala

object Sorting {
	def main(args: Array[String]) {
		var lst = Array(1, 6, 2, 12, 22, 8, 99, 45, 12, 28, 1,  54)
		val sortedList = quickSort(lst)
		for(i <- sortedList) {
			println(i)
		}
		
	}

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

val instead of var!