#+TITLE: Lisp

Lisp (or LISP, an acronym for LISt Processing) is a family of interpreted
programming languages. Lisp is one of the oldest family of programming languages
still used, with modern variants including:

- [[file:20200708123759-clojure.org][Clojure]]
- [[file:20200718223520-scheme.org][Scheme]]

Lisp has a long and varied history.

Expressions in Lisp are called /[[file:20210307153354-s_expression.org][s-expressions]]/, and they look like this:

#+begin_src lisp
(+ 1 2 3)
#+end_src

where =+= above is a function, called with arguments =1=, =2=, and =3=.

Lisps are simple to implement due to their usage of s-expressions, as
s-expressions are just [[file:20210307153537-abstract_syntax_tree.org][ASTs]].