one line sorting

[klochner]

def quick_sort(array)
  return array if array.length <=1
  pivot=array[array.length/2]
  return quick_sort(array.select {|i| i<pivot}) + array.select {|i|
i==pivot} + quick_sort(array.select {|i| i>pivot})
end

Why not use:

quick_sort(array.select {|i| i<=pivot}) + quick_sort(array.select {|i|
i>pivot})