You can't learn much from this article: it's about the trivialities of parsing lisp S-expressions in JavaScript.<p>Instead, read Peter Norvig's Lisp in Python (<a href="https://norvig.com/lispy.html" rel="nofollow">https://norvig.com/lispy.html</a>). You'll learn about lisp special forms, and you'll see how Python can be used to great effect.