An example of a Ruby gem written in Rust
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This is a boilerplate example of Ruby gem with native extension written in Rust. It will compile on target system using gem's native mechanism, but you have to have Rust and Cargo installed on the target system.

It uses Ruby Fiddle module to pass data between Ruby and Rust. For simplicity it uses JSON to pass complex data structures between Ruby and Rust.

You might want to use Ruby ffi to convert real types between Ruby and Rust, however, this requires more effort and possibly leads to memory management errors. But JSON is dead simple and robust.

Also, take a look at Helix project, which creates nice boilerplate-free API to communicate with Rust in Ruby.


You must have Rust with Cargo installed in order to build native extension. Get it on

Clone this repo and run rake compile to compile Rust source code into dynamic library. Then you can test it with rake run:

git clone
cd rustygem
rake compile
rake run

To integrate it into you Ruby application, add this line to your application's Gemfile:

gem 'rustygem', github: 'olegantonyan/rustygem'

And then execute:

bundle install


Call Rustygem.perform with a Hash argument, like this { some_integer: 32, some_string: 'hello' }. Refer to source code to see how it works.


After checking out the repo, run bin/setup to install dependencies. Then, run rake spec to run the tests. You can also run bin/console for an interactive prompt that will allow you to experiment.

To install this gem onto your local machine, run bundle exec rake install. To release a new version, update the version number in version.rb, and then run bundle exec rake release, which will create a git tag for the version, push git commits and tags, and push the .gem file to


Bug reports and pull requests are welcome on GitHub at This project is intended to be a safe, welcoming space for collaboration, and contributors are expected to adhere to the Contributor Covenant code of conduct.


The gem is available as open source under the terms of the MIT License.