UK Racket meet-up (London) Tuesday 21 July 2026 7:30pm

at The City Pride 🍕 28 Farringdon Ln, London EC1R 3AU

Join us for discussion and pizza. All welcome. 😁

https://racket.discourse.group/t/uk-racket-meet-up-london-tuesday-21-july-2026-7-30pm/4318 https://luma.com/u61y94uw

Bay Area Racket Meetup, Saturday August 1st​

At Noisebridge, SF.

Details/questions: https://racket.discourse.group/t/bay-area-racket-meetup-saturday-august-1st/4316

Register: https://luma.com/wbfxbzvx

Racket meet-up: Saturday, 1 August 2026 at 18:00 UTC

EVERYONE WELCOME 😁

register https://luma.com/x27tsmm5

Details and discussion https://racket.discourse.group/t/racket-meet-up-saturday-1-august-2026-at-18-00-utc/4315

You can use Racket with Rhombus.

Here is a simple example

First my design for the perfect fish in glorious Racket (the language of the gods): the-fish.rkt ```scheme

lang racket/base

(require pict) (provide perfect_fish) (define (perfect_fish n) (standard-fish n (/ n 2))) (module+ test (perfect_fish 100)) ```

Lets render this fabulous fish in Rhombus:

programmers-need-fish.rhm ```python

lang rhombus

import: pict open "the-fish.rkt" open

fun the_perfect_fish(w): Pict.from_handle(perfect_fish(w))

the_perfect_fish(200) ```

You may have noticed that I used an underscore _ in the perfect_fish identifier. This is because - is not permitted in Rhombus identifiers:

Identifiers are formed from Unicode alphanumeric characters plus _ and emoji sequences,

https://docs.racket-lang.org/shrubbery/token-parsing.html

(I admit I'm not ready to include emoji in identifiers)

For more details see Using Racket Tools and Libraries in the Rhombus Guide.

Make an image with Rhombus this summer! Win stickers! https://racket.discourse.group/t/summer-rhombus-picture-competition-2026/4282

We are looking for RacketCon speakers

If you are interested in presenting, nominating or have any questions please email us at [email protected].

— Stephen

UK Racket meet-up (Bristol) 8 July 2026

7:30-8:30pm, Wednesday 8 July 2026 at Pizza On The Park Berkeley Avenue (Top of Park Street), Bristol, BS8 1HP

https://luma.com/r7o3qd64 https://luma.com/r7o3qd64 https://racket.discourse.group/t/uk-racket-meet-up-bristol-8-july-2026/4299

UK Racket meet-up (Bristol) 8 July 2026

7:30-8:30pm, Wednesday 8 July 2026 at Pizza On The Park Berkeley Avenue (Top of Park Street), Bristol, BS8 1HP

https://luma.com/r7o3qd64 https://luma.com/r7o3qd64 https://racket.discourse.group/t/uk-racket-meet-up-bristol-8-july-2026/4299

Rhombus version 1.0 is now available!

Release announcement https://blog.racket-lang.org/2026/06/rhombus-v1.0.html

Get Rhombus: https://rhombus-lang.org/download.html

Rhombus is a general-purpose programming language that is easy to use and uniquely customizable.

Can someone test Racket BC for me and say what (eqv? 3e0+4e0i 3f0+4f0i) and (eqv? 3e0+4e0i 3e0+4f0i) return?

​

advTHANKSance

Summer Rhombus picture competition 2026

Competition: Make an image with Rhombus this summer! Win stickers!

1. While the rules require the use of Rhombus, they do not exclude using Racket or Racket libraries with Rhombus or the Rhombus FFI
2. I suggest the Rhombus pict library but you can use whatever you like!

What will you win? I'll send Rhombus stickers to the top 10 winners!

Closing date: Friday 18 September 2026. Winners will be announced at the (sixteenth RacketCon) 3-4 October 2026.

Announcement viewable at https://racket.discourse.group/t/summer-rhombus-picture-competition-2026/4282 (no login required to view)

Racket - the Language-Oriented Programming Language - version 9.2 is now available from https://download.racket-lang.org

See https://blog.racket-lang.org/2026/05/racket-v9-2.html for the release announcement and highlights.

On Linux DrRacket-9.2 starts about 1.5x faster than 9.0.

Why?

I have construct

(let ((count (ann 1 Positive-Integer)))

only operation I am doing with count is (+ count 1) ;; adding positive integer to positive integer

when i return count from function I get type error: found Integer, want Positive-Integer. Function declaration (: sets return type to Positive-Integer

I need to use (ann and not racket syntax sugar because its easy to remove types.

New release of racket-audio

[...] now also works with ffmpeg as backend and there's no special C-layer necessary anymore. The needed audio libraries are used directly.

https://racket.discourse.group/t/new-release-of-racket-audio/4209

racket-audio is a small audio playback toolkit for Racket. It combines high-level asynchronous playback, optional metadata reading, file type sniffing, decoder backends, and libao based output

Available now from https://pkgs.racket-lang.org/package/racket-audio

(Thanks Hans!)

The Spring Lisp Game Jam 2026 just started 🙀

https://itch.io/jam/spring-lisp-game-jam-2026

The (sixteenth RacketCon) really will be in Oakland, CA on October 3-4 (Sat-Sun).

RacketCon is a public gathering dedicated to fostering a vibrant, innovative, and inclusive community around the Racket programming language. We aim to create an exciting and enjoyable conference open to anyone interested in Racket, filled with inspiring content, reaching and engaging both the Racket community and the wider programming world.

We are looking for speakers

• If you would like to give a talk on something related to Racket, please submit your proposal at https://forms.gle/4YG57adx5snEwVe27
• If you know someone you would like to nominate please encourage them to submit a proposal, or let us know at [email protected].

Talks will be 20-25 minutes long with 5 minutes for questions at the end. Speakers' registration fees will be waived, but we are unable to cover transportation and lodging expenses.

The deadline for proposals is July 15th. Selected speakers will be notified by August 1st.

Streaming

As in previous years, RacketCon will be streamed for those unable to attend in person. Recordings will also be made available on YouTube some time after the conference. Streaming users will have the option to purchase a remote participation ticket to support the livestream.

Volunteers

Let us know if you interested in joining the team. Someone has to carry and arrange all the parentheses. :banana:

Sponsors

We are accepting sponsorships! If you would like to sponsor the conference, please contact us at [email protected] to discuss a sponsorship package that meets your needs. The Racket Programming Language Foundation is registered in Delaware and is recognizes as a 501(3)(c) public charity in the US.

Any questions, comments, or concerns? Please contact us at [email protected].

I'm looking for a Racket manual that focuses on building DSLs and general purpose languages in pure Racket (i.e. without BeautifulRacket). 'Cause Racket Guide lacks examples and is brief in general. The more examples of using `define-syntax` and others, the better.

I started learning Lisp through Scheme while reading Structure and Interpretation of Computer Programs. I'm still working through the book, but I've begun to use Racket instead since it seems to be a more mainstream Lisp while still having hygienic macros (I don't yet fully understand macro hygiene, but it sounds useful in theory).

Anyway, I've read that other Lisps like Common Lisp and Clojure are used more for their more extensive libraries. I like to learn a language by writing small libraries in it, so I was wondering what specific kinds of libraries are missing from the Racket ecosystem that I could work on.