Pete Heroku Waza 2013 Ruby 2.0
1 like592 views
This document summarizes Pete Hudgins' experience at the Heroku Waza 2013 conference. It discusses several talks Pete attended, including ones on Ruby 2.0, unfactoring code, instrumenting twelve-factor apps, and caring for ecosystems. It provides an overview of some new features in Ruby 2.0, such as keyword arguments, symbol array literals, UTF-8 encoding by default, and scoped monkey patching. The document also shares perspectives from Yukihiro Matz on why he created Ruby and what inspired Ruby 2.0.
![Keyword Arguments
Ruby 1.9:
def log(*msgs)
opt = msgs.last.is_a?(Hash) ? msgs.pop : {}
level = opt.key?(:level) ? opt.delete(:level) : "ERROR"
time = opt.key?(:time) ? opt.delete(:time) : Time.now
raise "unknown key: #{opt.keys.first}" if !opt.empty?
msgs.map do |msg|
puts "#{ time.ctime } [#{ level }] #{ msg }"
end
end](https://image.slidesharecdn.com/pete-heroku-waza-2013-final-130425125435-phpapp01/85/Pete-Heroku-Waza-2013-Ruby-2-0-14-320.jpg)
![Keyword Arguments
Ruby 2.0:
def log(msg, level: "ERROR", time: Time.now)
puts "#{ time.ctime } [#{ level }] #{ msg }"
end](https://image.slidesharecdn.com/pete-heroku-waza-2013-final-130425125435-phpapp01/85/Pete-Heroku-Waza-2013-Ruby-2-0-16-320.jpg)
![Symbol Array
Literals
Need a quick array of symbols?
%i(foo bar) # => [:foo, :bar]](https://image.slidesharecdn.com/pete-heroku-waza-2013-final-130425125435-phpapp01/85/Pete-Heroku-Waza-2013-Ruby-2-0-17-320.jpg)
Pete Heroku Waza 2013 Ruby 2.0
- 1. Heroku waza 2013 Lessons Learned Pete Hudgins Twitter: @phudgins Github: phudgins
- 3. I attended Keynote - Michael Lopp Unfactoring - Aaron Patterson Dismantling the Monorail - Jack Lawson Design Minded Development - Austin Bales Instrumenting Twelve-Factor Apps - Joseph Ruscio Caring for your Baby Ecosystem - Jacob Kaplan-Moss Ruby 2.0 - Yukihiro 'Matz' Matsumoto Everything is a Remix - Kirby Ferguson
- 4. Ruby 2.0
- 5. Yukihiro 'Matz' Matsumoto @yukihiro_matz Creator of Ruby Hired by Heroku as Chief Architect, Ruby
- 6. Why Ruby? "I hope to see Ruby help every programmer in the world to be productive, and to enjoy programming, and to be happy."
- 8. Ruby 2.0 Happiest release ever"
- 9. Why Ruby 2.0? 1.8.7 will die SOON 100% Compatible with Rails 4.0 Available on Heroku NOW Cool new features
- 10. Ruby 2.0 Features Keyword Arguments Symbol array literals UTF-8 by default Scoped Monkey-Patching
- 11. Keyword Arguments Use for named, optional arguments No specific order Descriptive Easy to remember
- 12. Keyword Arguments Ruby 1.9: def self.find_by_division_id(employer_id, opts={}) opts.symbolize_keys! params = opts.reject { |k,v| v.blank? } . . . end
- 13. Keyword Arguments What if we want: An arbitrary number of opts? To have nil as a valid value? Descriptive Exceptions?
- 14. Keyword Arguments Ruby 1.9: def log(*msgs) opt = msgs.last.is_a?(Hash) ? msgs.pop : {} level = opt.key?(:level) ? opt.delete(:level) : "ERROR" time = opt.key?(:time) ? opt.delete(:time) : Time.now raise "unknown key: #{opt.keys.first}" if !opt.empty? msgs.map do |msg| puts "#{ time.ctime } [#{ level }] #{ msg }" end end
- 16. Keyword Arguments Ruby 2.0: def log(msg, level: "ERROR", time: Time.now) puts "#{ time.ctime } [#{ level }] #{ msg }" end
- 17. Symbol Array Literals Need a quick array of symbols? %i(foo bar) # => [:foo, :bar]
- 19. monkey patching Ruby 1.9 uses Open Class Add methods to existing classes Replace methods in existing classes Example: ActiveSupport
- 20. monkey patching What could possibly go wrong?
- 21. monkey patching class String def to_slug(id) self.truncate(30, separator: ' ', omission: ''). parameterize + "-#{id}" end end
- 22. monkey patching class String def to_slug(id) "#{id}-" + self.truncate(30, separator: ' ', omission: ''). parameterize end end
- 23. monkey patching Global modification is BAD
- 25. Scoped monkey patching module GemName refine String def to_slug(id) . . . end end end
Editor's Notes
- #3: Japanese word for Art and Technique. As developers and engineers, we should think about our art and our craft.
- #5: Focus on Talk Ruby 2.0
- #6: Created Ruby on February 24, 1993
- #7: Why did Matz create Ruby? Other languages work ok Matz wanted something that was '...more powerful than Perl, and more object-oriented than Python Primarily:
- #8: Primarily: For me, the purpose of life is, at least partly, to have joy. Programmers often feel joy when they can concentrate on the creative side of programming, so Ruby is designed to make programmers happy.
- #9: Ruby 2.0 was released on its 20 th birthday. Matz considered the release schedule as Anniversary Driven Development or ADD
- #10: Why move to Ruby 2.0? Rails 4.0 prefers Ruby 2.0
- #13: We can do keyword arguments in 1.9, with an opts hash.
- #15: We clearly have an issue here..
- #17: We can do keyword arguments in 2.0
- #20: ActiveSupport example: 20.years.ago
- #22: One developer adds to_slug to String class
- #23: Another developer adds to_slug to String class
- #26: If you call to_slug without using the module, an error is thrown.