Still considering presenting at RacketCon? Contact us **now** at con-organizers@racket-lang.org
Racket
@racket-lang.org
Racket is... * a general purpose language * compiler, runtime and tools, * a diverse community https://racket-lang.org/ Rhombus is a general-purpose programming language that is easy to use and uniquely customizable. https://rhombus-lang.org
## We are looking for RacketCon speakers If you are interested in presenting, nominating or have any questions please email us at con-organizers@racket-lang.org. — Stephen
Summer Rhombus picture competition 2026 "A pictorial representation of the 118 chemical elements via the visual hash of their names using the Rhombus programming language." github.com/aanastasiou/... rhombus-lang.org racket.discourse.group/t/summer-rho...
Racket meet-up: Saturday, 1 August 2026 at 18:00 UTC EVERYONE WELCOME 😁 register luma.com/x27tsmm5 Details and discussion racket.discourse.group/t/racket-mee... #lisp #scheme
Racket meet-up: Saturday, 1 August 2026 · Luma
Racket meet-up: Saturday, 1 August 2026 at 18:00 UTC EVERYONE WELCOME 😁 Details and discussion…
luma.com
Bay Area Racket Meetup, Saturday August 1st At Noisebridge, SF. Details/questions: racket.discourse.group/t/bay-area-r... Register: luma.com/wbfxbzvx
Bay Area Racket Meetup, Saturday August 1st
Social event for people interested in the Racket programming language, other Lisps, functional programming, language-oriented programming and related topics. These will be monthly (first Saturday…
racket.discourse.group
![Comic. [Back of car with bumper sticker reading “I forth [red heart emoji]”]](https://cdn.bsky.app/img/feed_thumbnail/plain/did:plc:cz73r7iyiqn26upot4jtjdhk/bafkreie63wpgnvtc2bwmewc5o7vjndx7okspndmqn73ifodbzfzvs5nnyi)
TIL Jira supports Racket for code blocks in comments etc. @racket-lang.org
![```python
// efficient functional data structures
class Tree(val, children :: List.of(Tree)):
method flatten(): // O(N log N) for N `val`s
for fold(lst = [val]) (child in children):
// because append with `++` is O(log N)
lst ++ child.flatten()
Tree(1, [Tree(2, [Tree(4, [])]),
Tree(3, [Tree(5, [])])])
.flatten() // ⇒ [1, 2, 4, 3, 5]
```
(the 'python’ syntax highlighting in most markdown-like environments is sufficient for Rhombus)
Rhombus Programming Language
https://rhombus-lang.org
#rhombus](https://cdn.bsky.app/img/feed_thumbnail/plain/did:plc:55jpbxvlzoxmt4karrkj6mre/bafkreictnwp7loxsw2uccthkufypczo2yrkafdkbe3qvvo3ltzkavjfbpq)
![```
// pattern matching in all binding positions
class Posn(x, y)
fun flip_all([Posn(x, y), ...]):
[Posn(y, x), ...]
flip_all([Posn(1, 2), Posn(3, 4)])
// ⇒ [Posn(2, 1), Posn(4, 3)]
flip_all([Posn(5, 6)])
// ⇒ [Posn(6, 5)]
```
https://rhombus-lang.org](https://cdn.bsky.app/img/feed_thumbnail/plain/did:plc:55jpbxvlzoxmt4karrkj6mre/bafkreif5sne7ldzu4tykhhspfy3wtsq33quaoxfibbc4r2jh6lgbdhkpli)
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.😁 details: racket.discourse.group/t/uk-racket-... register: luma.com/u61y94uw
UK Racket meet-up (London) Tuesday 21 July 2026 7:30pm
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://luma.com/2efru5cn …
racket.discourse.group
Bay Area Racket Meetup, Saturday August 1st At Noisebridge, SF. Details/questions: racket.discourse.group/t/bay-area-r... Register: luma.com/wbfxbzvx
Bay Area Racket Meetup, Saturday August 1st
Social event for people interested in the Racket programming language, other Lisps, functional programming, language-oriented programming and related topics. These will be monthly (first Saturday…
racket.discourse.group
![Code sample from https://rhombus-lang.org
```rhombus
// ellipses to create and use repetitions
fun all_same([str0, str, ...]):
all(str0 == str, ...)
all_same(["hello", "hello", "hello"])
// ⇒ #true
all_same(["hello", "goodbye", "hello"])
// ⇒ #false
```](https://cdn.bsky.app/img/feed_thumbnail/plain/did:plc:55jpbxvlzoxmt4karrkj6mre/bafkreiazg6yfkwfp4cjihu2xdkz5qzhx4vnzx4ydgbn6k3x5hzrrwwk74m)
Racket meet-up: Saturday, 1 August 2026 at 18:00 UTC EVERYONE WELCOME 😁 register luma.com/x27tsmm5 Details and discussion racket.discourse.group/t/racket-mee... #lisp #scheme
Racket meet-up: Saturday, 1 August 2026 · Luma
Racket meet-up: Saturday, 1 August 2026 at 18:00 UTC EVERYONE WELCOME 😁 Details and discussion…
luma.com
Summer Rhombus picture competition 2026 "A pictorial representation of the 118 chemical elements via the visual hash of their names using the Rhombus programming language." github.com/aanastasiou/... rhombus-lang.org racket.discourse.group/t/summer-rho...
![// `for` as a general-purpose iteration and
// comprehension form
fun i_repeat(str :: String, n :: Nat) :: List:
for List (i in 0..n):
i+1 +& ". " +& str
i_repeat("hello", 3)
// ⇒ ["1. hello", "2. hello", "3. hello"]
https://rhombus-lang.org](https://cdn.bsky.app/img/feed_thumbnail/plain/did:plc:55jpbxvlzoxmt4karrkj6mre/bafkreiha5ammrikcikbq6rwfzpu2imdyrnxoqh2r7fnprqzkjedbjxd4ua)
Rhombus Programming Language // `:` for nesting, `|` for alternatives, // `::` for type-like checked annotations rhombus-lang.org
![// `:` for nesting, `|` for alternatives,
// `::` for type-like checked annotations
fun repeat(str :: String, n :: Nat) :: List:
if n == 0
| []
| [str] ++ repeat(str, n-1)
repeat("hello", 3)
// ⇒ ["hello", "hello", "hello"]
repeat(3, "hello")
// ⇒ error: 3 is not a String
https://rhombus-lang.org](https://cdn.bsky.app/img/feed_thumbnail/plain/did:plc:55jpbxvlzoxmt4karrkj6mre/bafkreiakvxttta5vwxrzxswpwvh2marozr74uopagsyblyicej7ewmv43a)
Racket is still one of the few programming environments where macro expansion feels like a principled substrate rather than implementation residue. Not syntax tricks. Names with meanings, phases, binding structure, language composition, and tools that understand the result. The post is from 2013!
Racket@racket-lang.org · 4w agodefine vs attach: “Racket’s macro system gives macros two ways of associating static (or compile-time) information with a particular name.” Learn more at rmculpepper.github.io/blog/2013/06...
![// pattern matching on objects, lists, and maps
class Rect(left, top, right, bottom)
fun rect_like_to_rect(v):
match v
| Rect(_, _, _, _): v
| {"LT": [l, t], "RB": [r, b]}: Rect(l, t, r, b)
| {"TL": [t, l], "BR": [b, r]}: Rect(l, t, r, b)
rect_like_to_rect({"LT": [0, 2], "RB": [10, 5]})
// ⇒ Rect(0, 2, 10, 5)
rect_like_to_rect({"TL": [0, 2], "BR": [10, 5]})
// ⇒ Rect(2, 0, 5, 10)](https://cdn.bsky.app/img/feed_thumbnail/plain/did:plc:55jpbxvlzoxmt4karrkj6mre/bafkreigkn4zyt5ajjhx3gwflbq32zlb3cm7vbwqaesrlxxeulhuaifml64)
define vs attach: “Racket’s macro system gives macros two ways of associating static (or compile-time) information with a particular name.” Learn more at rmculpepper.github.io/blog/2013/06...
define vs attach
the blog of Ryan Culpepper
rmculpepper.github.io
## We are looking for RacketCon speakers If you are interested in presenting, nominating or have any questions please email us at con-organizers@racket-lang.org. — Stephen
# RacketCon 2026: call for presentations Calling racketeers new or experienced, we want to hear from you. Are you unsure or just new to presenting? let us know - con-organizers@racket-lang.org - and we will do our best to help you. racket.discourse.group/t/racketcon-...
(sixteenth RacketCon) talk proposals
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…
forms.gle
｢ Rhombus is a general-purpose, functional, extensible programming language with good performance, extensive documentation, and practical libraries. It’s a dynamic language that offers interactivity and flexibility, but it also has the static and abstraction-enforcing constructs ｣
Rhombus v1.0
Rhombus version 1.0 is now available! Install: https://rhombus-lang.org/download.html More information: https://rhombus-lang.org/ Why a new language? https://rhombus-lang.org/goal.html…
blog.racket-lang.org
Racket meet-up: Saturday, 4 July 2026 at 18:00 UTC EVERYONE WELCOME 😁 Announcement, Jitsi Meet link & discussion at racket.discourse.group/t/racket-mee... luma.com/omsfos9h #lisp #scheme
Racket meet-up · Luma
Racket meet-up https://racket.discourse.group/t/racket-meet-up-saturday-4-july-2026-at-18-00-utc/4281 This is a casual friendly event, where people discuss…
luma.com
Get ready for the Bay Area Racket Meetup, Sat July 4, 3pm at Noisebridge SF Register luma.com/fbd1v9ix
Bay Area Racket Meetup #2 · Luma
Social event for people interested in the Racket programming language, other Lisps, functional programming, language-oriented programming and related…
luma.com
The release process for v9.3 will begin in about a week. If you have any new features that you want in and are relatively close to being done, now is a good time to do that. Upcoming dates: racket.discourse.group/t/racket-v9-...
Racket v9.3 release has started
The release process for v9.3 will begin in about a week. If you have any new features that you want in and are relatively close to being done, now is a good time to do that. Upcoming dates: - 7th:…
racket.discourse.group