Palestra dada durante a RubyMastersConf 2011, sobre o futuro da linguagem e o que anda na cabeça do Matz.

1. ao infinito... e além!
Ruby 2.0

3. Traits

4. module Logger
def log(message)
puts message
end
end
class ComplexBusiness
include Logger
# ...
end
ComplexBusiness.ancestors
# => [ComplexBusiness, Logger, ...]

5. module Logger
def log(message)
puts message
end
end
class ComplexBusiness
mix Logger
# ...
end
ComplexBusiness.ancestors
# => [ComplexBusiness, Object, ...]

6. module Extra; end
module More; end
class ComplexBusiness
include Extra
end
module Extra
include More
end
ComplexBusiness.ancestors
# => [ComplexBusiness, Extra, Object, ...]
Extra.ancestors
# => [Extra, More]

7. module Logger module EmailNotification
def error(message) def error(message)
puts "ERROR #{message}" # send mail ...
end end
def info(message) end
puts "INFO #{message}"
end
end

8. class ComplexBusiness
include Logger
include EmailNotification
end

9. class ComplexBusiness
mix Logger
mix EmailNotification # exception!
end

10. class ComplexBusiness
mix Logger, :error => :log_error
mix EmailNotification
end

11. class ComplexBusiness
mix Logger, :error => nil
mix EmailNotification
end

12. Method Combination

13. class ComplexBusiness
def log(message)
puts message
end
end

14. module Formatter
def log(message)
original_log("*** #{message} ***")
end
end
class ComplexBusiness
def log(message)
puts message
end
end

15. module Formatter
def log(message)
original_log("*** #{message} ***")
end
end
class ComplexBusiness
def log(message)
puts message
end
include Formatter
end

16. module Formatter
def log(message)
original_log("*** #{message} ***")
end
end
alias_method_chain ?
class ComplexBusiness
def log(message)
puts message
end
include Formatter
end

17. module Formatter
def log(message)
original_log("*** #{message} ***")
end
end
class ComplexBusiness
def log(message)
puts message
end
mix Formatter
end

18. module Formatter
def log(message)
super("*** #{message} ***")
end
end
class ComplexBusiness
def log(message)
puts message
end
mix Formatter, :log => []
end

19. module Formatter
def log(message)
super("*** #{message} ***")
end
end
class ComplexBusiness
def log(message)
puts message
end
prepend Formatter
end

20. ComplexBusiness.ancestors
# => [Formatter, ComplexBusiness, ...]

21. **kwargs

22. transfer amount: 100,
from: company,
to: employee

23. transfer amount: 100,
from: company,
to: employee
def transfer(hash)
value = hash[:amount]
source = hash[:from]
destination = hash[:to]
# do the transfer ...
end

24. transfer amount: 100,
from: company,
to: employee
def transfer(amount: value,
from: source,
to: destination)
# do the transfer ...
end

25. Refinements

27. require "rspec"
describe RSpecWithRefinements do
it "patches objects only inside this block" do
"some string".should respond_to(:should_not)
1234.should respond_to(:should_not)
end
end
1234.should # error!

28. refine Klass {}
using Namespace
escopo léxico
herança, class_eval,
module_eval, instance_eval

29. Ruby ISO
standardization

30. Rite
embedding Ruby

31. Dúvidas?
fabio.kung@gmail.com
fabio.kung@locaweb.com.br Obrigado!
http://twitter.com/fabiokung