Crystal Book
Welcome to the documentation for the Crystal language.
Crystal is a language for humans and computers. These materials help humans understand the language and its ecosystem.
Learning Materials
These instructions and courses help you get to know the language and how to use it.
Getting started
Install Crystal and get it running.
Guides
Detailed examples for practical applications.
Grow in Crystal
The core documentation of the Crystal language, standard library, and tooling.
Language Reference
Specification of the language.
Standard Library API
Documentation of the standard library.
Compiler Manual
Instructions on how to use the compiler and tools.
Contribute
If you want to dive into the development of Crystal, these materials give some guidance.
Contributing Instructions
A guide on how to open issues and contribute code to the Crystal project.
Code of Conduct
Our standards and expectations about working together as a community.
Governance document
How we take the decisions that guide the language and its community.
Developer resources
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/reference/index.html