# Reactive web app template
  module App
  using GenieFramework
  @genietools

  # add reactive code to make the UI interactive
  @app begin
      # reactive variables are tagged with @in and @out
      @in N = 0
      @out msg = "The average is 0."

      # watch a variable and exe code when its value changes
      @onchange N begin
          # the message in the UI will update automatically
          result = sum(rand(N))/N
          msg = "The average is $result."
      end
  end

  # register a new route and the page to load on access
  @page("/", "app.jl.html")
  end