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Crystal reference with language specification, manuals and learning materials
| Date | Stars |
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| 2026-07-30 | 425 |
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# 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 parameters. - 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](https://crystal-lang.org/api).** ## 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: https://github.com/crystal-lang/crystal-book Thank you very much! ### Branches There is a separate branch for every minor Crystal release, all deployed alongside each other on https://crystal-lang.org/reference/ Typically, only branches of maintained releases receive updates, i.e. the branch for the most recent Crystal release. - Changes that apply to the current Crystal release should go into the most recent `release/*` branch. - Changes that apply to yet unreleased features should go into `next`. They'll be part of the `release/*` branch for the next release. The `next` branch is deployed at https://crystal-lang.org/reference/master/ ### Building and Serving Locally ```shell git clone https://github.com/crystal-lang/crystal-book cd crystal-book pip install -r requirements.txt ``` Live preview (at http://127.0.0.1:8000): ```console $ make serve INFO - Building documentation... INFO - Cleaning site directory INFO - Documentation built in 3.02 seconds INFO - Serving on http://127.0.0.1:8000 ... ``` Build into the `site` directory (some functionality won't work if opening the files locally): ```shell make build ``` ### devenv environment This project includes configuration for a reproducible environment via [devenv.sh](https://devenv.sh/) with integrated pre-commit checks. Live preview (at http://127.0.0.1:8000): ```console $ devenv up Building shell ... pre-commit-hooks.nix: hooks up to date 17:37:13 system | serve.1 started (pid=6507) 17:37:13 serve.1 | INFO - Building documentation... 17:37:13 serve.1 | INFO - Cleaning site directory 17:37:16 serve.1 | INFO - Documentation built in 2.64 seconds 17:37:16 serve.1 | INFO - [17:37:16] Watching paths for changes: 'docs', 'mkdocs.yml' 17:37:16 serve.1 | INFO - [17:37:16] Serving on http://127.0.0.1:8000/reference/latest/ ```` Build the site: ```console $ devenv shell build Building shell ... pre-commit-hooks.nix: hooks up to date rm -rf ./site properdocs build -d ./site --strict INFO - Cleaning site directory INFO - Building documentation to directory: ./site INFO - Documentation built in 2.43 seconds ``` Enter the development shell and build the site from there: ```console $ devenv shell Building shell ... Entering shell ... pre-commit-hooks.nix: hooks up to date $(devenv) make build properdocs build -d ./site --strict INFO - Cleaning site directory INFO - Building documentation to directory: ./site INFO - Documentation built in 2.43 seconds ``` Run pre-commit checks on the entire repository: ```shell devenv ci ``` ### Adding a page To add a page, create a Markdown file in the desired location. Then, add a link in the `SUMMARY.md` file which acts as the navigation for the language reference.
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