uniqc

How many times have you had an array of things and wanted a simple count of unique items?

things = [true, true, true, false, false, true, false, true]
# => [true, true, true, false, false, true, false, true]
things.group_by { |x| x }.map { |k,v| [k,v.count] }
# => [[true, 5], [false, 3]]

I can count too many times. That .group_by { |x| x }.map { |k,v| [k,v.count] } is quite a lot to type for something I use so commonly.

The unix command uniq(1) has a -c option that does a count, this gem adds a similar method to the ruby Array class.

Add this line to your application's Gemfile:

gem 'uniqc'

And then execute:

$ bundle

Or install it yourself as:

$ gem install uniqc

things.uniqc
# => [[true, 5], [false, 3]]

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/tlehman/uniqc.

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