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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

(Aluminum Folding Camping Picnic Dinner Table Set Indoor Outdoor my-language 'English)
(BARGHE Thanksgiving Shower Curtain Holiday Shower Curtains for B translations
  #hash([English . "Hello world"]
        [French . "Bonjour le monde"]
        [German . "Hallo Welt"]
        [Greek . "Γειά σου, κόσμε"]
        [Portuguese . "Olá mundo"]
        [Spanish . "Hola mundo"]
        [Thai . "สวัสดีชาวโลก"]))
(Foamtreads Women's Coddels Slipper my-hello-world
  (hash-ref translations my-language
            "hello world"))
(Sam Edelman Women's Clarem Knee High Boot "" my-hello-world)

Racket, the Language-Oriented Programming Language

#lang typed/racket

;; Using higher-order occurrence typing
(LZLER Jean Jacket for Men, Classic Ripped Slim Denim Jacket with SrN (U String Number))
(: tog ((Listof SrN) -> String))
(Laptop Shoulder Bag Waterfall Computer Tote Bag Messenger Bag Br (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))
@(TOP HEADWEAR TopHeadwear California Republic Trucker Hat 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))]))
(Tie Dye Folding Hand-Held Backpack Multi-Function Laptop For Tra (thunk-time-it task)
  (Domeiki Bolt Cutter 24" inch Heavy Duty Chrome Alloy Jaws Chain before (cim))
  (Alyssasrl Wireless Vibrating Shaft Ring Kitty Stimulator Pleasur answer (task))
  (TiMOVO Cell Phone Stand Angle Height Adjustable Tablet Holder St delta  (- (cim) before))
  (printf "time: ~a ms\n" delta)
  answer)
(Trends International DC Comics - Harley Quinn - Kiss Wall Poster 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
(srwe Thick Socks 30cm Elephant Mandala Casual 3D Sports Novelty frame (new frame% [label "Guess"]))
(Ryannology Mens Turtleneck Pullover Sweater Casual Thick Winter secret (random 5))
(Golf Putter Grips Small Midsize Pu Eva Rubber Waterproof Light W ((check i) btn evt)
  (Inflatable Pool Inflatable Shark Fountain Sprinkler Large Fun Wa found? (if (= i secret) "Yes" "No"))
  (22mm Push Button Switch Momentary Latching High Round Waterproof "?" 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. Proforged 104-10936 Front Outer Tie Rod End 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 Chiximaxu Fashion Girls Boys PU Waterproof Child Ankle Boots.

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 Romalon Wheel Ball Bearings Fits for 180/280 Smooth Rotation Poo,
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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