Values At Nested

values_at_nested allows extraction of hash values at various depth of the hash.

It's an extended version of ruby's #values_at hash method.

Installation

Add this line to your application's Gemfile:

gem 'values_at_nested'

And then execute:

$ bundle

Or install it yourself as:

$ gem install values_at_nested

Usage

Given the following hash:

h = { name: 'Albert', degree: 'Physics', preferences: { color: 'orange', pet: 'cat' } }

You can deep extract values:

h.values_at_nested(preferences: :pet)
=> [['cat']]

h.values_at_nested(:degree, preferences: [:color])
=> ['Physics', ['orange']]

Or extrac values in the first level just like normal #values_at does:

h.values_at_nested(:name)
=> ['Albert']

h.values_at_nested(:name, :degree)
=> ['Albert', 'Physics']

h.values_at_nested(:name, :degree, :preferences)
=> ['Albert', 'Physics', ['orange', 'cat']]

It works for any nested levels. Check test case for 3-level, and 4-level depth examples.

Documentation

RDoc version at RubyDoc.

Development

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.

Contributing

Bug reports and pull requests are welcome on GitHub.

License

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