# Arboricx and tricu

> tricu is a programming language built on Tree Calculus. Arboricx carries compiled programs between hosts. This site is the language homepage and browser playground.

## Write programs

- [Playground guide](./assets/50084c4f83d662eb27c259d59b176502886fa4e4d48a36ca7096568a98039696/reference/getting-started.md): source, expressions, imports, output settings, IO, diagnostics and sharing.
- [Library directory](./assets/50084c4f83d662eb27c259d59b176502886fa4e4d48a36ca7096568a98039696/reference/libraries.md): complete published interfaces, versions, exact manifest imports and calling conventions.
- [Machine-readable library index](./assets/50084c4f83d662eb27c259d59b176502886fa4e4d48a36ca7096568a98039696/reference/libraries.json): the same metadata used by Add import.
- [Language features](./assets/50084c4f83d662eb27c259d59b176502886fa4e4d48a36ca7096568a98039696/reference/language-features.md): patterns, recursion, local bindings, sequencing and library protocols.
- [Language contract](./assets/50084c4f83d662eb27c259d59b176502886fa4e4d48a36ca7096568a98039696/reference/language.md): source syntax and semantics.
- [Worked examples](./assets/50084c4f83d662eb27c259d59b176502886fa4e4d48a36ca7096568a98039696/reference/examples.md): complete programs, settings and expected results.
- [Modules and packages](./assets/50084c4f83d662eb27c259d59b176502886fa4e4d48a36ca7096568a98039696/reference/modules.md): source modules and portable bundle identities.

## Protocols and boundaries

- [Contracts](./assets/50084c4f83d662eb27c259d59b176502886fa4e4d48a36ca7096568a98039696/reference/contracts.md): input validation and Result protocols.
- [Parser combinators](./assets/50084c4f83d662eb27c259d59b176502886fa4e4d48a36ca7096568a98039696/reference/parser.md): replies, progress and rollback.
- [Host ABI](./assets/50084c4f83d662eb27c259d59b176502886fa4e4d48a36ca7096568a98039696/reference/host-abi.md): IO actions and host capabilities.
- [Native CLI](./assets/50084c4f83d662eb27c259d59b176502886fa4e4d48a36ca7096568a98039696/reference/build-and-run.md): run and package programs outside the browser.
- [License](./assets/50084c4f83d662eb27c259d59b176502886fa4e4d48a36ca7096568a98039696/reference/LICENSE.txt): source and documentation licensing.

Start with the playground guide, then fetch the relevant library release pages. Static references are available without executing WebAssembly.