README.md

Rats

Welcome to your new gem! In this directory, you'll find the files you need to be able to package up your Ruby library into a gem. Put your Ruby code in the file lib/rats. To experiment with that code, run bin/console for an interactive prompt.

TODO: Delete this and the text above, and describe your gem

Installation

Add this line to your application's Gemfile:

gem 'rats'

And then execute:

$ bundle

Or install it yourself as:

$ gem install rats

Usage

# Result

def increment(x)
  if x.is_a?(Fixnum)
    Rats.success(x+1)
  else
    Rats.failure('x should be Fixnum')
  end
end

def divide_by(x, y)
  if y == 0
    Rats.failure("can't divide by zero")
  else
    Rats.success(x/y)
  end
end

result = increment(x).flat_map {|a| divide_by(a, 2) }

if result.success?
  puts "Success: #{result.value}"
else
  puts "Failure: #{result.value}"
end

Development

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.

Contributing

Bug reports and pull requests are welcome on GitHub at https://github.com/PavelPenkov/rats.

License

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