Methods

This gem aims at making referencing methods in the Ruby language easier. It is greatly inspired by this issue on the Ruby bug tracker. It allows you to grab a reference to a method by simply calling method on an object and calling the method you want on the result

irb(main):006:0> Math.method.sqrt
=> #<Method: Math.sqrt>

It allows parameters currying and respects method's visibility.

Add this line to your application's Gemfile:

gem 'methods'

And then execute:

$ bundle

Or install it yourself as:

$ gem install methods

irb(main):006:0> Math.method.sqrt
=> #<Method: Math.sqrt>

[4, 9, 16].map(&Math.method.sqrt).map(&:to_i).each(&method.puts)
2
3
4
=> [2, 3, 4]

Yiu can curry any number of arguments in front of the argument list

[4, 9].map(&Math.method.sqrt).map(&:to_i).each(&method.puts("foo", "bar"))
foo
bar
2
foo
bar
3
=> [2, 3]

Also, currying keyword arguments works

irb(main):011:0> def adder(a, b, c:)
irb(main):012:1> a + b + c
irb(main):013:1> end
=> :adder
irb(main):014:0> [1,2,3].map(&method.adder(1, c: 5))
=> [7, 8, 9]

Block currying

irb(main):001:0> def add_to_block(a)
irb(main):002:1> a + yield
irb(main):003:1> end
=> :add_to_block
irb(main):004:0> add_two = method.add_to_block { 2 }
=> #<Proc:0x007f91a8013290@/Users/sevos/Projects/methods/lib/methods/methods_wrapper.rb:14 (lambda)>
irb(main):005:0> [1,2,3].map(&add_two)
=> [3, 4, 5]
irb(main):006:0> add_two.call(3) { 5 }
=> 8
irb(main):007:0> add_two.call(3)
=> 5

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/sevos/methods. 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.

Many thanks to Beni Cherniavsky-Paskin for the inspiration of the syntax!

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