The Ruby Reference is intended to be most full, actual and accessible language reference. Most of the reference content is taken directly from Ruby documentation and reorganized for easier reading. The core docs were augumented with some quotes from the Ruby website, and some missing content that is written specifically for the book. The source of the book (rendering scripts, config, and unique content) can be found at GitHub. Today I am releasing the new version, which was fully re-rendered for Ruby 2.6 and also includes some content and style fixes. Changelog.