LinkedLists

Adds the linked list structure to Ruby as a proper Enumerable class, like Set or Array.

Has a similar set of methods to Array and Set.

There are situations in which a linked list would be faster than an array. Shifting and unshifting elements for example.

This library, for now, is implemented in Ruby which dwindles any performance benefits from using this data structure when compared to the native Ruby Array.

I will reimplement it as a C extension, with the same API in the future.

Installation

Install the gem and add to the application's Gemfile by executing:

$ bundle add linked_lists

If bundler is not being used to manage dependencies, install the gem by executing:

$ gem install linked_lists

Usage

There is a new data structure called LinkedList which may be used similarly to Set or Array.

It is a proper Enumerable.

list = LinkedList[1, 2, 3]
list #=> #<LinkedList: {1, 2, 3}>
list.shift #=> 1
list #=> #<LinkedList: {2, 3}>
list.unshift(:new) #=> #<LinkedList: {:new, 2, 3}>

list.each do |value|
    p value
end
# :new
# 2
# 3

LinkedList[1, 2] + LinkedList[5,  'str'] #=> #<LinkedList: {1, 2, 5, 'str'}>

LinkedList[10, 20, 30].map { |a| a * 2 } #=> #<LinkedList: {20, 40, 60}>
list = LinkedList[10, 20, 30]
list.map!(&:to_s)
list #=> #<LinkedList: {"10", "20", "30"}>
list.to_a #=> ["10", "20", "30"]

LinkedList[:foo, nil, :bar, nil].compact #=> #<LinkedList: {:foo, :bar}>

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 the created tag, and push the .gem file to rubygems.org.

Contributing

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

License

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