Introduction to Racket Tutorial was posted on August 11, 2026.

Racket is a descendant of Lisp, a language developed in 1958 by John McCarthy at MIT. Lisp introduced concepts such as garbage collection, first‑class functions, and the read‑eval‑print loop, which remain influential in contemporary programming languages.

The tutorial explains that Racket extends Scheme, a minimalist Lisp dialect, and provides a platform for creating new languages. Users begin by writing a language pragma line, #lang racket, in DrRacket or a terminal REPL. Example expressions such as (+ 1 2) evaluate to 3, and (string-append "hello " "world") produce "hello world". The syntax requires every operation to be enclosed in parentheses, eliminating operator precedence rules.

Definitions are created with define; constants use define without parentheses, while functions use define with arguments. Anonymous functions are expressed with lambda, and higher‑order functions such as map, filter, and foldl enable list processing without explicit loops. Recursion is expressed by defining a base case and a step toward that base, as shown in a factorial example.

Racket includes a graphics library that can generate images, demonstrated by a Sierpinski triangle program. The language’s homoiconicity allows code to be treated as data, enabling meta‑programming through macros that receive code and return code before execution.

Racket is used in academic research, formal verification tools like Rosette, typography systems such as Pollen, and education worldwide. Related Lisp dialects, including Clojure, Common Lisp, and Emacs Lisp, run in production at companies and institutions. An Easter egg in the digital animation The Amazing Digital Circus references a Lisp implementation of an AI character.

Installation requires downloading the Racket installer from racket-lang.org and launching DrRacket, which provides a definitions area and a REPL. The tutorial directs readers to resources such as How to Design Programs, the Racket Guide, and the book Beautiful Racket, and notes that language‑oriented programming remains an active area of exploration.