If you are still in the REPL, quit out of it so that
rebar3 can rebuild our changed module. Then start it up again:
$ rebar3 lfe repl
Once at the LFE propmpt, start up the application:
lfe> (application:ensure_all_started 'guessing-game)
With the application and all of its dependencies started, we're ready to start the game and play it through:
lfe> (guessing-game:start-game) ;; ok ;; Guess the number I have chosen, between 1 and 10.
lfe> (guessing-game:guess 10) ;; ok ;; Your guess is too high.
lfe> (guessing-game:guess 1) ;; ok ;; Your guess is too low.
lfe> (guessing-game:guess 5) ;; ok ;; Your guess is too low.
lfe> (guessing-game:guess 7) ;; ok ;; Your guess is too low.
lfe> (guessing-game:guess 8) ;; ok ;; Well-guessed!! ;; Game over
Success! You've just done something pretty amazing, if still mysterious: you've not only created your first OTP application running a generic server, you've successully run it through to completion!
Until we can dive into all the details of what you've seen in this walkthrough, much of what you've just written will seem strange and maybe even overkill. For now, though, we'll mark a placeholder for those concepts: the next section will briefly review what you've done and indicate which parts of this book will provide the remaining missing pieces.