Haversack is an enumerable abstraction of a Knapsack. Itis a proof of concept for a knapsack data structure, used for projects like this one.
require 'haversack'
haversack = Sack.new(capacity: 10, weight: 10)
items = Array.new(10) { Haversack::Item.new(weight: 1, size: 1) }
haversack.contents = items
## Haversack provides constraints upon what items may be set as the knapsack contents:
too_large = Array.new(haversack.capacity + 1) { Haversack::Item.new }
haversack.contents = too_large # => Haversack::KnapsackCapacityExceededError
## Or you may add one item at a time
item = Haversack::Item.new
haversack.push(item) if haversack.fits_item? itemAdd this line to your application's Gemfile:
gem 'haversack'And then execute:
$ bundle
Or install it yourself as:
$ gem install haversack
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/alex0112/haversack.
The gem is available as open source under the terms of the MIT License.