Insertion Sort - HotRuby - Ruby on JavaScript & Flash

class InsertionSort
  msg = "[ Insertion Sort ]"
  puts msg
  
  def sort ary
    puts "Before insertion sort:"
    puts ary
  
    for i in 1..(ary.length-1) do
      n = i
      while n >= 1 && ary[n] < ary[n - 1] do
        if ary[n] < ary[n - 1]
          tmp = ary[n]
          ary[n] = ary[n - 1]
          ary[n - 1] = tmp
        end
        n -= 1
      end
    end
    
    puts "After insertion sort:"
    puts ary
  end
end

InsertionSort.new.sort [3, 6, 2, 5, 3, 7, 1, 8]