require 'sinatra'

def stringify_array(arr)
  return "not an array" unless arr.is_a? Array
  return arr.join("$").split("$")
end

get '/' do
  "<pre>
  Using a combination of Array’s join method and String’s split method, write a line of code that converts [1,2,3] into [\"1\", \"2\", \"3\"].
  ANSWER

  def stringify_array(array)
    return \"not an array\" unless arr.is_a? Array
    return arr.join('$').split('$')
  end

  stringify_array([1,2,3,4,5,6,7,8]) = #{stringify_array([1,2,3,4,5,6,7,8])}
  </pre>"
end