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