Combinate

A simple utility gem that combines all products of all combinations of an array of arrays, including combinations where some or all of the arrays are not chosen from at all.

Add this line to your application's Gemfile:

gem 'combinate'

And then execute:

$ bundle

Or install it yourself as:

$ gem install combinate

require 'combinate'

Combinate.combinate([[1,2],[3,4]])
=> [[1], [2], [3], [4], [1, 3], [1, 4], [2, 3], [2, 4]]

require 'combinate/core_ext/array'

[[1,2],[3,4]].combinate
=> [[1], [2], [3], [4], [1, 3], [1, 4], [2, 3], [2, 4]]

After checking out the repo, run bin/setup to install dependencies. Then, run rake spec 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/azanar/combinate.