https://github.com/garybernhardt/cls
Cls lets you define classes with a more terse syntax. It's useful for presenters and other classes that have many small methods. For example:
class UserPresenter
include Cls
takes :user
let(:full_name) { [@user.first_name, @user.last_name].join(" ") }
end
Contrast that with the standard Ruby version:
class UserPresenter
def initialize(user)
@user = user
end
def full_name
[@user.first_name, @user.last_name].join(" ")
end
end
Pretty big difference, huh?
Cls started as the Shorty class in Raptor. There's also a Destroy All Software screencast that discusses the implementation.
Struct can give you approximately what takes
does, but it requires inheriting from Struct and it will default omitted constructor arguments to nil. I don't like it as a solution, inheritance and silent nils both being evil.
Ruby 1.8 will allow you to pass the wrong number of arguments to a block, which can be confusing. It throws a warning, so you should at least be notified that you're doing it. This problem doesn't exist in Ruby 1.9.