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Racket

Racket - Programming language

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Racket is an open source programming language created in 1994 by Matthias Felleisen and Matthew Flatt and Robert Bruce Findler and Shriram Krishnamurthi.

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Try now: Riju · TIO

Racket is a general purpose, multi-paradigm programming language in the Lisp-Scheme family. One of its design goals is to serve as a platform for language creation, design, and implementation. The language is used in a variety of contexts such as scripting, general-purpose programming, computer science education, and research. Read more on Wikipedia...


Example from Riju:
#lang racket/base (display "Hello, world!\n")
Example from hello-world:
#lang racket "Hello World"
;; Hello world in Racket #lang racket/base "Hello, World!"
Example from Linguist:
; Clean, simple and efficient code -- that's the power of Racket! ; http://racket-lang.org/ (define (bottles n more) (printf "~a bottle~a of beer~a" (case n [(0) "no more"] [(1) "1"] [else n]) (if (= n 1) "" "s") more)) (for ([n (in-range 99 0 -1)]) (bottles n " on the wall, ") (bottles n ".\n") (printf "Take one down and pass it around, ") (bottles (sub1 n) " on the wall.\n\n")) (displayln "No more bottles of beer on the wall, no more bottles of beer.") (displayln "Go to the store and buy some more, 99 bottles of beer on the wall.")
Example from Wikipedia:
#lang typed/racket (: fact (Integer -> Integer)) (define (fact n) (cond [(zero? n) 1] [else (* n (fact (- n 1)))]))

Language features

Feature Supported Token Example
Print() Debugging display
Homoiconicity
Line Comments ;
; A comment
Module Pattern
(module nest racket
   (provide (for-syntax meta-eggs)
            (for-meta 1 meta-chicks)
            num-eggs)
   (define-for-syntax meta-eggs 2)
   (define-for-syntax meta-chicks 3)
   (define num-eggs 2))
Prefix Notation
(+ 1 2 3)
Mixins
(mixin (interface-expr ...) (interface-expr ...)
 class-clause ...)
Macros
; https://docs.racket-lang.org/guide/macros.html
(define-syntax-rule (swap x y)
(let ([tmp x])
  (set! x y)
  (set! y tmp)))
File Imports
(require (prefix-in tcp: racket/tcp))
Comments
Symbol Tables
;; Some programming languages allow the symbol table to be manipulated at run-time, so that symbols can be added at any time.
Lispy
Strings "
"hello world"
Case Insensitive Identifiers X
Semantic Indentation X

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