Rollr

Rollr a gem that simulates rolling dice.

Add this line to your application's Gemfile:

gem 'rollr'

And then execute:

$ bundle

Or install it yourself as:

$ gem install rollr

$ gem install rollr
$ irb
> require 'rollr'
#=> true

Rollr lets you make Die, and these die can have any number of sides.

> d6 = Rollr::Die.new(6)

When you roll a Die, you get a RollReport.

> d6.roll
#=> <Rollr::RollReport #hash total: 3, rolls: [3], number_of_dice: 1, die_sides: 6>
> d6.roll
#=> <Rollr::RollReport #hash total: 6, rolls: [6], number_of_dice: 1, die_sides: 6>

You can roll multiple dice of the same kind by passing a number to the roll argument.

> d6.roll(number: 3)
#=> <Rollr::RollReport #hash total: 9, rolls: [3, 5, 1], number_of_dice: 3, die_sides: 6>

> result = d6.roll(number: 3)
#=> <Rollr::RollReport #hash total: 14, rolls: [2, 6, 6], number_of_dice: 3, die_sides: 6>

The RollReport has few helpful things to report about your roll.

The #total method represents the sum total of the dice that were rolled:

> result.total
#=> 14

The #rolls array, which reports the individual results of any dice rolled:

> result.rolls
#=> [2, 6, 6]

#number_of_dice tells you how many dice were rolled this time:

result.number_of_dice
#=> 3

#die_sides reports the number of sides on the dice rolled in this result:

result.die_sides
#=> 6

Roll results can be further manipulated after their original creation. To facilitate popular use-cases for Dice rolling, RollReports also include public #drop_lowest and #drop_highest methods.

#drop_lowest returns a new RollReport without the lowest numerical die roll.

> result = d6.roll(number: 4)
#=> <Rollr::RollReport #hash total: 14, rolls: [3, 1, 4, 6], number_of_dice: 4, die_sides: 6>

> result.rolls
#=> [3, 1, 4, 6]

> result.total
#=> 14

> new_result = result.drop_lowest
#=> <Rollr::RollReport #hash total: 13, rolls: [3, 4, 6], number_of_dice: 3, die_sides: 6>

> new_result.rolls
#=> [3, 4, 6]

> new_result.total
#=> 13

Similarly, #drop_highest will remove the highest number in the rolls array.

> new_result = result.drop_highest
#=> <Rollr::RollReport #hash total: 8, rolls: [3, 1, 4], number_of_dice: 3, die_sides: 6>

> new_result.rolls
#=> [3, 1, 4]

> new_result.total
#=> 8

Both #drop_lowest and #drop_highest can also take an optional integer argument.

> new_result = result.drop_highest(2)

> new_result.rolls
#=> [3, 1]

> new_result.total
#=> 4

Rollr comes pre-packaged with several shortcuts for popular Die sizes:

#D20
> result = Rollr::D20.roll
#=> <Rollr::RollReport #hash total: 18, rolls: [18], number_of_dice: 1, die_sides: 20>

#D12
> result = Rollr::D12.roll
#=> <Rollr::RollReport #hash total: 6, rolls: [6], number_of_dice: 1, die_sides: 12>

#D2-6, D8, and D10!

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/alxjrvs/rollr. This project is intended to be a safe, welcoming space for collaboration, and contributors are expected to adhere to the Contributor Covenant code of conduct.

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