Standard Library Reference, Functions & Ready-to-Run Code Examples
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Ruby reads like natural English. The principle of least surprise makes it one of the fastest languages to learn and enjoy writing.
Ruby on Rails powers Shopify, GitHub, and Airbnb. A single developer can build a complete web application in hours.
Ruby's reflection and dynamic dispatch allow DSLs and code that writes code — uniquely powerful for building frameworks.
RubyGems hosts 170,000+ libraries. Install any library with gem install name or Bundler.
Run a Ruby program:
ruby script.rb # run Ruby script directly ruby -e 'puts "Hello"' # one-liner execution ruby -c script.rb # syntax check without running bundle exec ruby script.rb # run with Bundler gems irb # interactive Ruby REPL gem install rails # install a gem bundle install # install all Gemfile gems rubocop script.rb # lint and style check
