![Actually...
• In ruby, they’re called blocks
• Enumerators (Loops)
• 42.times do
p “What is the meaning of life?”
end
• [ 1 , 2 , 3 ].each do |i|
p i.to_kittens
end](https://image.slidesharecdn.com/rubyvcpppreso-110728105437-phpapp02/85/Ruby-v-cpp_preso-17-320.jpg)
Ruby v cpp_preso
- 1. Ruby!? Yep.
- 2. The Plan • Language Intro & Features • Environment Install • Hello World Sinatra App on Heroku
- 3. C++ • Statically Typed Compiled Language • int x = 2; • x = “a”; • uh oh...
- 4. Ruby • Dynamically Typed Interpreted Scripting Language • x=2 • x = “a” • Mmhhmm
- 5. Ruby Features • http://ruby-lang.org/en/about • REPL • Rubygems • Everything is an object • Monkey patching • Easy closures • Mixins
- 6. REPL It’s How You Learn
- 7. What it is, yo?! • REPL = Read Eval Print Loop • Err... • It’s a command line tool to write ruby • IRB & Pry • Pry :: http://vimeo.com/26391171
- 8. In C++ • A C++ REPL? • I guess... • http://www.artificialworlds.net/wiki/IGCC/ IGCC
- 9. Rubygems Package Management Made Easy
- 10. There’s a Gem for That • Wait, there isn’t? • Write your own and publish • > gem install rails > rails new my_sweet_app > cd my_sweet_app > rails s > open http://0.0.0.0:3000/ • You now have the beginnings of a web application • http://rubygems.org/
- 11. Everything Is An Object
- 12. Literally... • 5.class => Fixnum • “What?!”.length => 6 • “What?!”.length.class => Fixnum
- 13. I Don’t Believe It • 42.class => Fixnum • 42.class.superclass => Integer • 42.class.superclass.superclass => Numeric • 42.class.superclass.superclass.superclass => Integer • 42.class.superclass.superclass.superclass.superclass => Object
- 14. Monkey Patching
- 15. Too Silly To Be Real • Just kidding • Crazy language flexibility • class Fixnum def to_kittens return to_s << “ kitten” if abs == 1 to_s << “ kittens” end end • 5.to_kittens => “5 kittens” • -1.to_kittens => “-1 kitten”
- 16. Easy Closures
- 17. Actually... • In ruby, they’re called blocks • Enumerators (Loops) • 42.times do p “What is the meaning of life?” end • [ 1 , 2 , 3 ].each do |i| p i.to_kittens end
- 18. Mixins...
- 19. ...Use Them • Composition vs. (Multiple?) Inheritance • Keep your code fresh and clean • module Kittens def to_kittens return to_s << “ kitten” if abs == 1 to_s << “ kittens” end end • Fixnum.include Kittens • 5.to_kittens => “5 kittens”
- 20. Let’s Get Setup RTFM
- 21. Command Line • Mac: Terminal.app • Mac: iTerm 2 alpha - http://iterm2.com • Windows: cmd.exe • Windows: Cygwin - http://cygwin.com • MSys Git - http://code.google.com/p/ msysgit/
- 22. Package Installer • Mac: homebrew - https://github.com/mxcl/ homebrew • Windows: Uhhh...
- 23. Ruby • Mac: > brew install ruby • Windows: http://rubyinstaller.org/
- 24. Ruby Version Managers • Why do we need these? • Mac: rvm - https:// rvm.beginrescueend.com/ • Windows: pik - https://github.com/ vertiginous/pik
- 25. Git • Mac: http://git-scm.com/download • Windows: Cygwin packages/preferences
- 26. A Nice Little Web App
- 27. Sinatra • Your first web app • http://www.sinatrarb.com/
- 28. Heroku • We’ll need to setup a few more things • Gemfile • Procfile • Git repo
- 29. Gemfile • Tells heroku which gems we’ll need • > gem install bundler • Add a file called Gemfile (capital G is important) with the following contents... source :rubygems gem “sinatra” gem “heroku”, :group => :development • > bundle
- 30. Procfile • Tells heroku how to boot our web app • Add a file called Procfile (capital P is important) with the following contents... web: ruby -rubygems hi.rb -p $PORT
- 31. Git Repo • Run the following in your terminal • > git init > git add . > git commit -m “my first git commit!”
- 32. Heroku Again • Sign Up - http://heroku.com • > heroku apps:create --stack=cedar > git push heroku master > heroku open • If your heroku commands aren’t working, try prepending them with “bundle exec” e.g. > bundle exec heroku open