gistfile1.txt

    def distance(*args)
      flattened = args.flatten
            
      if flattened.length == 3
        hash_arg = flattened.pop
        raise ArgumentError unless hash_arg.respond_to?(:each_key)
        flattened << hash_arg[:to][0] 
        flattened << hash_arg[:to][1]
      end

      final_args = flattened.select{|number| number.respond_to?(:integer?) }
      raise ArgumentError unless final_args.length == 2 || final_args.length == 4

      return measure_distance(*final_args)
    end
    
    def measure_distance(first_x, first_y, second_x=0, second_y=0)
      x = first_x - second_x
      y = first_y - second_y
      return Math.sqrt((x*x) + (y*y))
    end