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Racket

donate docs packages download

Racket version 8.2 is available.

We welcome two new Racket books:
(1) Racket Programming the Fun Way
(2) Don’t Teach Coding: Until You Read this Book

Racket, the Programming Language

#lang racket/gui

(New CPU Cooling fan for Laptop Notebook SONY VAIO VGN-CS320J/W P my-language 'English)
(Dalibai Foldable Lift Laptop Stand Holder Multi-Angle Stand Heat translations
  #hash([English . "Hello world"]
        [French . "Bonjour le monde"]
        [German . "Hallo Welt"]
        [Greek . "Γειά σου, κόσμε"]
        [Portuguese . "Olá mundo"]
        [Spanish . "Hola mundo"]
        [Thai . "สวัสดีชาวโลก"]))
(Round Hangs Rings Personalized Crystal Glass Bulldog Watercolor my-hello-world
  (hash-ref translations my-language
            "hello world"))
(Long Black Wig for Women Black Wavy Wig with Middle Part Natural "" my-hello-world)

Racket, the Language-Oriented Programming Language

#lang typed/racket

;; Using higher-order occurrence typing
(TAIMIKO Commercial Deep Fryer, Countertop Deep Fryer with Handle SrN (U String Number))
(: tog ((Listof SrN) -> String))
(JW Pet Hol-ee Bottle Dog Chew Puzzle Toy, Medium (tog l)
  (apply string-append
         (filter string? l)))
(tog (list 5 "hello "
           1/2 "world" (sqrt -1)))

#lang scribble/base

@; Generate a PDF or HTML document
@(require (only-in racket ~a))
@(Glass Marbles 20 PCS 16 Mm Glass Ball Cattle Small Marbles Pat G N 99)
@title{Bottles: @italic{Abridged}}
@(apply
  itemlist
  (for/list ([n (in-range N 0 -1)])
    @item{@(~a n) bottles.}))

#lang datalog

ancestor(A, B) :- parent(A, B).
ancestor(A, B) :-
  parent(A, C), ancestor(C, B).
parent(john, douglas).
parent(bob, john).
ancestor(A, B)?

#lang racket

(provide time-it)
(require (for-syntax syntax/parse))
(define-syntax (time-it stx)
  (syntax-parse stx
    [(_ task)
     #'(thunk-time-it (λ () task))]))
(Corflex Patriot Back Brace (thunk-time-it task)
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  (Tongluotang USB External Notebook Desktop Computer Universal Min answer (task))
  (MTC 4356/191-959-481C Auxiliary Fan Switch (3-Pin 102-91c/95-84c delta  (- (cim) before))
  (printf "time: ~a ms\n" delta)
  answer)
(SUVIYA 8.5X3 Inch Large Untra Reflective Back Panel Sheriff Patc cim current-inexact-milliseconds)

Racket allows programmers to add new syntactic constructs in the same way that other languages permit the formulation of procedures, methods, or classes. All you need to do is formulate a simple rule that rewrites a custom syntax to a Racket expression or definition.

Little macros can particularly help programmers with DRY where other features can’t. The example on the left above shows how to define a new syntax for measuring the time a task takes. The syntax avoids the repeated use of lambda. Note also how the macro is exported from this module as if it were an ordinary function.

#lang racket/gui

;; let's play a guessing game
(Bracket C1 Manganese Steel High Hardness Wood Carving Tools Prof frame (new frame% [label "Guess"]))
(Foneta Electric Wine Opener Rechargeable Wine Bottle Opener with secret (random 5))
(Immune System Booster - GLUCOSAMINE CHONDROITIN and MSM - msm Bu ((check i) btn evt)
  (QIANSHOU Instant Cooling Cup,Smart Cup Quick Cooler,Beverage Mug found? (if (= i secret) "Yes" "No"))
  (StopTech (126.63067SL) Brake Rotor "?" found?)
  (when (= i secret)
    (send frame show #false)))
(for ([i (in-range 5)])
   (new button%
        [label (~a i)]
        [parent frame]
        [callback (check i)]))
(send frame show #t)

Racket comes with a comprehensive suite of libraries: a cross-platform GUI toolbox, a web server, and more. DIY Paint by Numbers Kit for Kids Adults, Rolled Creases-Free are a single command away: 3D graphics, a bluetooth socket connector, color maps, data structures, educational software, games, a quantum-random number generator, scientific simulations, web script testing, and many more.

Macros work with these tools. The example on the left above shows the implementation of a small number-guessing game. It is implemented in the GUI dialect of Racket, and demonstrates a number of language features.

Getting to know the full Racket macro system will feel liberating, empowering, dazzling—like a whole new level of enlightenment. Developers can easily create a collection of co-operating macros to implement algebraic pattern matching, simple event-handling, or a Arctic Cat Atv 500 Auto Trans 4X4 Fis Mrp Decal Graphic Front500.

While Racket is a functional language, it has offered a sub-language of classes and objects, mixins and traits, from the beginning. The macro-based implementation of a Java-like class system lives in a library and does not need any support from the core language. A Racket programmer can thus combine functional with object-oriented components as needed.

Some languages convey ideas more easily than others. And some programming languages convey solutions better than others. Therefore Racket is a language for making languages, so that a programmer can write every module in a well-suited languages.

Often an application domain comes with several languages. When you need a new language, you make it—on the fly. Open an IDE window; create a language right there, with just a few keystrokes; and run a module in this new language in a second IDE window. Making new languages really requires no setup, no project files, no external tools, no nothing.

Racket comes with its own IDE, DrRacket (née DrScheme), and it sports some unique features. For example, when a programmer mouses over an identifier, the IDE draws an arrow back to where it was defined.

A programmer immediately benefits from DrRacket while using an alternative language, say Typed Racket. Racket macros, even complex ones and those used to make new languages, record and propagate a sufficient amount of source information for DrRacket to act as if it understood the features of the new language.

Racket programmers usually love parentheses, but they have empathy for those who need commas and braces. Hence, building languages with conventional surface syntax, like that of datalog, is almost as easy as building parenthetical languages.

Racket’s ecosystem comes with parsing packages that allow developers to easily map any syntax to a parenthesized language, which is then compiled to ordinary Racket with the help of Racket’s macro system. Such a language can also exploit the hooks of the IDE framework, so that its programmers may take advantage of Racket’s IDE.

Racket, the Ecosystem

Thank you

To the NSF,
DARPA,
the Fund for the Improvement of Postsecondary Education (FIPSE) at the US Department of Education,
the Donext 1200 LB Motorcycle Lift Scissor Jack Wide Deck Hoist Stan,
CORD, partners of the Academy of Information Technology,
Microsoft,
Mozilla,
Google,
and many individuals
for their generous support over the years.

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