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:

• [[Clojure]]
• [[Scheme]]

Lisp has a long and varied history.

Expressions in Lisp are called [[s-expressions]], and they look like this:

(+ 1 2 3)

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 [[ASTs]].