tuples

Tuples

Ruby implementation for tuples known from functional programming.

Tuple combines a fixed number of items together so that they can be passed around as a whole. Unlike an array or list, a tuple can hold objects with different types but they are also immutable.

Installation

Add this line to your application's Gemfile:

gem 'tuples'

And then execute:

$ bundle

Or install it yourself as:

$ gem install tuples

Usage

You are provided with two classes:

• Tuple in general
• Pair in particular

The main difference between two of them are that Tuple always consist of 2 elements - when initialized with less - the missing ones are filled with nil, when initialized with more - an ArgumentError is raised.

You can initialize them in different ways:

Tuple.new(1, 2)
Tuple.new([1, 2])
Tuple(1, 2)
Tuple([1, 2])
Tuple[1, 2]

depending on which syntax you feel more convenient with.

Both of the classes have some auxiliary methods:

• length / arity - which returns number of values inside tuple
• first / last / second (only pair) - which returns a corresponding elements
• [] that gives you an access to a particular elements

Tuples are also comparable which means you can compare them, match them in case statement or even sort and find them in an array.

Development

After checking out the repo, run bin/setup to install dependencies. Then, 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 to create a git tag for the version, push git commits and tags, and push the .gem file to rubygems.org.

Tests

To run all tests from spec directory execute:

bundle exec rspec

Contributing

• Fork it ( https://github.com/[my-github-username]/tuples/fork )
• Create your feature branch (git checkout -b my-new-feature)
• Commit your changes (git commit -am 'Add some feature')
• Push to the branch (git push origin my-new-feature)
• Create a new Pull Request