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  • 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

  • Racket is a mature and stable product. From the beginning, it has supported cross-platform graphical programming (Windows, macOS, Linux).

  • Racket includes a rich set of libraries, covering the full range from web server apps to mathematics and scientific simulation software.

  • In Racket, programmers define their own loops with powerful macros. Indeed, these macros are so powerful that programmers make entire domain-specific languages as libraries. No tools, no Makefiles required.

  • Racket is the first language to support higher-order software contracts and safe gradual typing. Programmers can easily deploy these tools to harden their software.

  • Racket comes with support for major editors. The main bundle includes an innovative and extensible interactive development environment that has inspired other IDE projects.

  • Newcomers describe the on-line Racket community as extremely friendly and helpful. Everyone is welcome to ask any question and everybody is welcome to contribute to the open-source code base.

  • Racket, the Language-Oriented Programming Language

  • #lang typed/racket

    ;; Using higher-order occurrence typing
    (555 water balloons are quickly filled and self-sealed, suitable SrN (U String Number))
    (: tog ((Listof SrN) -> String))
    (MANHONG Electronic Circuit Wiring Connector 10Pcs Length 20CM 26 (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))
    @(Anti Blue Light Optical Eyewear Anti-Fatigue Blue Light Blocking 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))]))

    (Stainless Steel Pineapple Peeler, Core Remover Tool,Pineapple Co (thunk-time-it task)
    (MIABE Candle Ring Supplies for Set of 2 - Wood 3" Taper Candle H before (cim))
    (WraptorSkinz Zig Zag Blue Green - Decal Style Skin fits Amazon K answer (task))
    (Berkshire Women's Silky Sheer Knee High Sandalfoot Pantyhose 638 delta (- (cim) before))
    (printf "time: ~a ms\n" delta)
    answer)

    (Nautica Girls' Fleece Full-Zip Hoodie Sweatshirt 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

    (FFA Text White, Quilting Fabric by the Yard frame (new frame% [label "Guess"]))

    (Taper Reducing Adapter Drill Sleeve, MT3 To MT1 Silver MT3 To MT secret (random 5))
    (3 Pieces Bedding Duvet Cover Set Christmas Cut ((check i) btn evt)
    (marofin Electric Wine Opener Set ,Automatic Wine Corkscrew kit w found? (if (= i secret) "Yes" "No"))
    (FAMIROSA Garden Storage Shed with 4 Vents Metal Steel Double Sli "?" 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. Delidigi 2 Pack Case for Apple Pencil 1st Gen, Soft Silicone Sle 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 INLIFE Pool Fountain,Stainless Steel Waterfall Garden Outdoor Po.

    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

  • Community

    Friendly environment policy

    Mailing lists and Blog

    Racket Discord

    #racket IRC on libera.chat

    Slack channel (Visit this link to sign up)

    @racketlang on Twitter

    Racket channel on YouTube

    Team
    Racket’s development benefits from a large distributed pool of contributors.

    Software Freedom Conservancy
    Make a tax-deductible contribution to support our work.

  • Books

    Realm of Racket
    Learn to program with Racket, one game at a time.

    Beautiful Racket
    Make your own programming languages with Racket.

    Server: Racket
    Develop a web application with Racket.

    All Racket Books

  • Education

    The Racket Summer School
    a summer school for researchers, professionals, and (under)graduate students to the Racket philosophy of programming languages

    Program by Design (aka TeachScheme!)
    a curriculum and training programfor high school teachers and college faculty

    Bootstrap
    a curriculum and training program for middle-school and high-school teachers


  • Swag

    Racket T-Shirts — the perfect way to meet friends, influence people, and stay warm.

    Racket Stickers — the indispensable accessory for laptops and textbooks.

  • Thank you
  • To the NSF,
    DARPA,
    the Fund for the Improvement of Postsecondary Education (FIPSE) at the US Department of Education,
    the Tommaso Pista Aria Knit Women's Indoor Cycling Class Ready Shoe,
    CORD, partners of the Academy of Information Technology,
    Microsoft,
    Mozilla,
    Google,
    and many individuals
    for their generous support over the years.