Racket

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Racket is... * a general purpose language * compiler, runtime and tools, * a diverse community Rhombus is a general-purpose programming language that is easy to use and uniquely customizable.

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Bluesky

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Racket@racket-lang· 5h

Tonight! UK Racket meet-up (London) Tuesday 18 August 2026 7:30pm at The City Pride 🍕 28 Farringdon Ln, London EC1R 3AU Join us for discussion and pizza. All welcome.😁

RacketCon banner https://con.racket-lang.org

Racket@racket-lang· 1d

We are pleased to announce Rhombus 1.1 is now available from rhombus-lang.org Rhombus is easy to use and uniquely customizable. See blog.racket-lang.org/2026/08/rhom... for the release announcement and highlights.

Racket@racket-lang· 2d

Racket - the Language-Oriented Programming Language - version 9.3 is now available from download.racket-lang.org See blog.racket-lang.org/2026/08/rack... for the release announcement and highlights.

Racket@racket-lang· Jul 18

efficient functional data structures Rhombus Programming Language rhombus-lang.org #rhombus

```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

Racket@racket-lang· Jul 15

pattern matching in all binding positions Rhombus Programming Language rhombus-lang.org #rhombus

```
// 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

Racket@racket-lang· Jul 12

ellipses to create and use repetitions #rhombus

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
```

Racket@racket-lang· Jul 11

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@racket-lang· Jul 11

// `for` as a general-purpose iteration and // comprehension form #rhombus

// `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

Racket@racket-lang· Jul 10

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

Racket@racket-lang· Jul 9

pattern matching on objects, lists, and maps #rhombus

$// pattern matching on objects, lists, and maps class Rect(left, top, right, bottom) fun rect_like_to_rect(v): match v | Rect(_, _, _, _): v | {"LT": [l, t], "RB": [r, b]}: Rect(l, t, r, b) | {"TL": [t, l], "BR": [b, r]}: Rect(l, t, r, b) rect_like_to_rect({"LT": [0, 2], "RB": [10, 5]}) // ⇒ Rect(0, 2, 10, 5) rect_like_to_rect({"TL": [0, 2], "BR": [10, 5]}) // ⇒ Rect(2, 0, 5, 10)$

Racket@racket-lang· Jul 8

## 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

Racket@racket-lang· Jul 1

Summer Rhombus picture competition 2026 racket.discourse.group/t/summer-rho...

Summer Rhombus picture competition in the fransans unlicensed public transit signage font

Racket@racket-lang· Jun 29

Getting Started with Rhombus docs.racket-lang.org/rhombus-gett... Everything you need to get started with the programming language that is easy to learn and use - and is uniquely customizable.

Getting Started with Rhombus
Quick Start

Choose your own adventure:

Rhombus Guide: Get a general introduction and tour of Rhombus.

Quick Introduction to Rhombus: Get just a taste of the language—and then continue to the guide.

Rhombus Metaprogramming Tutorial: For programming-language enthusiasts, dive into the deep end of macros and language extensibility.

Explore the language definition:

Rhombus Reference: The main language reference.

Rhombus Metaprogramming Reference: The main reference for macro support and language extensibility.

Rhombus Language Model: Conceptual prelude to the reference manuals, defines the language’s core evaluation model and it’s syntax concepts as layered on Shrubbery notation.

Shrubbery Notation: The language’s underlying syntax substrate, which lifts a textual representation of code and data to syntax objects and other values.

Rhombus and Racket Interoperability: Take advantage of more libraries in the Racket ecosystem.

Rhombus Documentation: If you’re reading this in your local installation, then it’s all documentation that you have installed. If you’re reading from http://docs.racket-lang.org, it documentation for all registered Rhombus and Racket packages, including third-party packages.

Racket@racket-lang· Jun 28

Why a new language? rhombus-lang.org/goal.html

Racket@racket-lang· Jun 27

A language that is easy to learn and use and uniquely customizable? blog.racket-lang.org/2026/06/rhom...

Racket@racket-lang· Jun 26

Get ready for the Bay Area Racket Meetup, Saturday, July 4 These will be monthly (first Saturday at 3pm) until RacketCon at Noisebridge hackerspace. Register at luma.com/fbd1v9ix More details: racket.discourse.group/t/bay-area-r...

2x2 grid of Racket(pride) and Rhombus logos

Racket@racket-lang· Jun 25

What kind of programming language is Rhombus? blog.racket-lang.org/2026/06/rhom... Join us discord.gg/6Zq8sH5

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 that are needed to scale from small scripts to large systems.

Racket@racket-lang· Jun 16

A metacircular interpreter in Rhombus: github.com/racket/rhomb... Rhombus is a general-purpose programming language that is easy to use and uniquely customizable. rhombus-lang.org

code for metacircular interpreter in Rhombus - code at link in post

Racket@racket-lang· Jun 16

Racket@racket-lang· Jun 15

Twins!

Racket@racket-lang· Jun 13

OH: "Man, you can create a huge number of languages. I have a set theory book sitting here, but with Racket I can read through it and prove the concepts as I go." (via Racket Discord discord.gg/6Zq8sH5 )

"It's Peak" meme image
man holding glasses with speech bubble 'IT'S PEAK!'
taken to mean a moment of realisation

Racket@racket-lang· Jun 5

Chart ‘happiness chemicals and how to hack them’
With a box for four chemicals, but with the image altered to add ‘Do Racket related stuff’ to set of guidance.
Shamelessly plucked from @fakehistoryhunter.net doing the same for ‘History related stuff’. I do not know the original source.

Racket@racket-lang· May 28

Racket - the Language-Oriented Programming Language - version 9.2 is now available from download.racket-lang.org See blog.racket-lang.org/2026/05/rack... for the release announcement and highlights.

Racket@racket-lang· May 26

(sixteenth RacketCon) call for participation racket.discourse.group/t/racketcon-...

(sixteenth RacketCon) call for participation
as a lower decks title card from https://trek.epicrandomness.com

Racket@racket-lang· May 17

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.” racket.discourse.group/t/new-releas... Available now from pkgs.racket-lang.org/package/rack...

Racket@racket-lang· May 10

It's now official: (sixteenth RacketCon) really will be in Oakland, CA on October 3-4 (Sat-Sun).

Completely unrelated image of a sleeping cat added purely for shock value.

Racket@racket-lang· Apr 17

OH: Rhombus now has an FFI for direct use of C-based foreign libraries... Would you like to know more? Join us in #rhombus on the Racket Discord: discord.gg/QYwmjgQmAS

Racket@racket-lang· Apr 4

Happy easter!

Egg made with Racket - decorated with standard-fish motif

Racket@racket-lang· Apr 3

UK Racket meet-up: London Tuesday 21 April 7:30pm at The City Pride 🍕 28 Farringdon Ln, London EC1R 3AU Join us for discussion and pizza. All welcome. racket.discourse.group/tag/event/9 luma.com/8zqv0paq www.eventbrite.com/e/uk-racket-...

Racket@racket-lang· Mar 31

Happy International Transgender Day of Visibility. Racket has a meet-up on April 4th and everyone is welcome Details at racket.discourse.group/t/racket-mee...