Crystal Programming Language

This is the language reference 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.

Crystal's standard library is documented in the API docs.

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 language reference. You can submit a pull request to this repository:

Thank you very much!

Building and Serving Locally

$ git clone
$ cd crystal-book
$ npm install -g gitbook-cli@2.3.0
$ npm install
$ gitbook 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/ Then, add a link in the file which acts as the navigation for the language reference.

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