SimpleMath

A simple math gem which provides a set of tools for math operations, currently you can play with a very basic calculator. See the TODO section for nice to have features.

Installation

Add this line to your application's Gemfile:

gem 'simple_math'

And then execute:

$ bundle

Or install it yourself as:

$ gem install simple_math

Usage

Calculator

The following will resolve ((((5 + 3) - 2) * 4) / 2)

result = SimpleMath::Calculator.run(start: 5) do |dc|
  dc[:+][3]
  dc[:-][2]
  dc[:*][4]
  dc[:/][2]
end

p result #=> 12.0

But you can also do this, which is very cool

object = Struct.new(:operation, :number) }
objects =
  [
    object.new(:+, 3),
    object.new(:-, 2),
    object.new(:*, 4),
    object.new(:/, 2)
  ]
result = SimpleMath::Calculator.run(start: 5) do |dc|
  objects.each do |o|
    dc[o.operation][o.number]
  end
end

p result #=> 12.0

The +start+ argument is completely optional and by defauly is 0

result = SimpleMath::Calculator.run do |h|
  h[:+][3]
end

p result #=> 3

TODO

• Implement more basic functions to the Calculator
• Implement complex math operations
• Refactor the DSL so Rubocop does not complains about big &blocks

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 at https://github.com/[username]/simple_math. 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.

License

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

Code of Conduct

Everyone interacting in the SimpleMath project’s codebases, issue trackers, chat rooms and mailing lists is expected to follow the code of conduct.