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Crystal Programming Language

This is the documentation for the Crystal programming language.

Crystal is a programming language with the following goals:

  • Have a syntax similar to Ruby (but compatibility with it is not a goal).
  • Be 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.

Contributing to the Language Reference

Do you consider yourself a helpful person? If you find bugs or sections which need more clarification you're welcome to contribute to this documentation. You can submit a pull request to this repository: https://github.com/crystal-lang/crystal-book

Thank you very much!

Building and Serving Locally

$ git clone https://github.com/crystal-lang/crystal-book.git
$ cd crystal-book
$ npm install -g gitbook-cli@2.3.0
$ npm install
$ gitbook serve
Live reload server started on port: 35729
Press CTRL+C to quit ...

info: 8 plugins are installed
info: loading plugin "ga"... OK
...
Starting server ...
Serving book on http://localhost:4000

Html output will be in _book folder (some links won't work if opening the files locally). There is also a docker environment to avoid installing dependencies globally:

$ docker-compose up
...
gitbook_1  | Starting server ...
gitbook_1  | Serving book on http://localhost:4000
gitbook_1  | Restart after change in file node_modules/.bin
...

Adding a page

To add a page, create a markdown file in the desired location. Example: overview/hello_world.md. Then, add a link in the SUMMARY.md file which acts as the navigation for the documentation.

To the extent possible under law, the persons who contributed to this workhave waived
all copyright and related or neighboring rights to this workby associating CC0 with it.
https://crystal-lang.org/docs/index.html