Microjoin

Microjoin strips out some repetition from cases where you're doing relational algebra in plain Ruby. For some reason.

Installation

Add this line to your application's Gemfile:

gem 'microjoin'

And then execute:

$ bundle

Or install it yourself as:

$ gem install microjoin

Usage

The whole thing reduces to queries such as the following:

Microjoin::([1,2,3], [2,3,4]).inner.on { |v| v }
# {
#   2 => [ [2], [2] ],
#   3 => [ [3], [3] ]
# }
Microjoin::([1,2,3], [[2],[3],[4]]).outer.on(left: -> (v) { v }, right: -> (arr) { arr[0] })
# {
#   1 => [ [1], [   ] ],
#   2 => [ [2], [[2]] ],
#   3 => [ [3], [[3]] ],
#   4 => [ [ ], [[4]] ]
# }

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.

Contributing

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

License

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