IRB stands for "interactive Ruby" and is a tool to interactively execute Ruby expressions read from the standard input.
irb command from your shell will start the interpreter.
Add this line to your application's Gemfile:
And then execute:
Or install it yourself as:
$ gem install irb
Use of irb is easy if you know Ruby.
When executing irb, prompts are displayed as follows. Then, enter the Ruby expression. An input is executed when it is syntactically complete.
$ irb irb(main):001:0> 1+2 #=> 3 irb(main):002:0> class Foo irb(main):003:1> def foo irb(main):004:2> print 1 irb(main):005:2> end irb(main):006:1> end #=> nil
The Readline extension module can be used with irb. Use of Readline is default if it's installed.
After checking out the repo, run
bin/setup to install dependencies. Then, run
rake test 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 rubygems.org.
Bug reports and pull requests are welcome on GitHub at https://github.com/ruby/irb.
The gem is available as open source under the terms of the 2-Clause BSD License.