Sinatra OO style using helpers

sinatra_oo_helpers.rb

require 'sinatra'

get '/' do
  my_domain.say_hello
end

get '/bye' do
  my_domain.say_goodbye
end

helpers do
  def my_domain
    MyDomain.new
  end
end

class MyDomain
  def say_hello
    "Hello World"
  end
  def say_goodbye
    "Goodbye"
  end
end