(defun hello (&optional name) "Say hello, optionally to NAME." (let ((greetee (or name "World"))) (concat "Hello, " greetee "!")))
Be careful. Once you grok Emacs, you may never be able to use another editor again.Join the Emacs Lisp track
Exercism is a great website where I was able to have some very interesting challenges.
Once you join the Emacs Lisp language track, you will receive support and feedback from our team of mentors. Here are the bios of a few of the mentors of this track.
These are a few of the 27 exercises on the Emacs Lisp track. You can see all the exercises here.