We want to write calculations using functions and get the results.

six(times(five)) # must return 30
one(plus(nine)) # must return 10
six(minus(three)) # must return 3
eight(divided_by(two)) # must return 4

• There must be a function for each number from 0 (“zero”) to 9 (“nine”)
• There must be a function for each of the following mathematical operations: plus, minus, times, divided_by
• Each calculation consist of exactly one operation and two numbers
• The most outer function represents the left operand, the most inner function represents the right operand

gem 'lambda_calculus', git: 'https://github.com/paxer/lambda_calculus'

And then execute:

$ bundle

Use directly via

LambdaCalculus.six(LambdaCalculus.times(LambdaCalculus.five))

or

class MyClass
  extend LambdaCalculus
  
  def my_method
    six(times(five)) 
  end
end

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/paxer/lambda_calculus.

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