back to home

crystal-lang / crystal

The Crystal Programming Language

20,242 stars
1,665 forks
1,995 issues
CrystalShellJavaScript
Chat with CodebaseArchitecture ScanSecurity AuditExplain Codebase

AI Architecture Analysis

This repository is indexed by RepoMind. By analyzing crystal-lang/crystal in our AI interface, you can instantly generate complete architecture diagrams, visualize control flows, and perform automated security audits across the entire codebase.

Our Agentic Context Augmented Generation (Agentic CAG) engine loads full source files into context, avoiding the fragmentation of traditional RAG systems. Ask questions about the architecture, dependencies, or specific features to see it in action.

Click here to launch the interactive analysis workspace

Embed this Badge

Showcase RepoMind's analysis directly in your repository's README.

[![Analyzed by RepoMind](https://img.shields.io/badge/Analyzed%20by-RepoMind-4F46E5?style=for-the-badge)](https://repomind-ai.vercel.app/repo/crystal-lang/crystal)
Preview:Analyzed by RepoMind

Repository Summary (README)

Preview

Crystal

Linux CI Build Status macOS CI Build Status AArch64 CI Build Status Windows CI Build Status CircleCI Build Status Join the chat at https://gitter.im/crystal-lang/crystal Code Triagers Badge

Crystal - Born and raised at Manas

Crystal is a programming language with the following goals:

  • Have a syntax similar to Ruby (but compatibility with it is not a goal)
  • Statically type-checked but without having to specify the type of variables or method arguments.
  • Be able to call C code by writing bindings to it in Crystal.
  • Have compile-time evaluation and generation of code, to avoid boilerplate code.
  • Compile to efficient native code.

Why?

We love Ruby's efficiency for writing code.

We love C's efficiency for running code.

We want the best of both worlds.

We want the compiler to understand what we mean without having to specify types everywhere.

We want full OOP.

Oh, and we don't want to write C code to make the code run faster.

Project Status

Within a major version, language features won't be removed or changed in any way that could prevent a Crystal program written with that version from compiling and working. The built-in standard library might be enriched, but it will always be done with backwards compatibility in mind.

Development of the Crystal language is possible thanks to the community's effort and the continued support of 84codes and every other sponsor.

Installing

Follow these installation instructions

Try it online

play.crystal-lang.org

Documentation

Community

Have any questions or suggestions? Ask on the Crystal Forum, on our Gitter channel or IRC channel #crystal-lang at irc.libera.chat, or on Stack Overflow under the crystal-lang tag. There is also an archived Google Group.

Contributing

The Crystal repository is hosted at crystal-lang/crystal on GitHub.

Read the general Contributing guide, and then:

  1. Fork it (https://github.com/crystal-lang/crystal/fork)
  2. Create your feature branch (git checkout -b my-new-feature)
  3. Commit your changes (git commit -am 'Add some feature')
  4. Push to the branch (git push origin my-new-feature)
  5. Create a new Pull Request