cocktailsort.rb

def cocktailsort(array)
  arr = Array.new(array)
  swapped = true
  while swapped do
    swapped = false
    for i in 0.upto(arr.length-2) do
      if arr[i] > arr[i+1] then
        arr[i], arr[i+1] = arr[i+1], arr[i]
        swapped = true
      end
    end
    !swapped ? break : nil
    swapped = false
    for i in (arr.length-2).downto(0) do
      if arr[i] > arr[i+1] then
        arr[i], arr[i+1] = arr[i+1], arr[i]
        swapped = true
      end
    end
  end
  arr
end