Interrest in Ruby? I think these are 10 things you should know about it. This slide is released under CC-BY-NC-SA

1. 10 Things
You Should Know About
Ruby

2. 1. Ruby != Rails

3. • Programming Language
• 1995 – First public release
• Many Implementations
• MRI 1.8 – Matz’s Ruby
Intepreter
• YARV 1.9
• JRuby
• IronRuby
• Rubinius
• MacRuby
• MagLev

4. “I wanted a scripting language that was more powerful
than Perl, and more object-oriented than Python.That's
why I decided to design my own language”

5. Smalltalk
Perl
Lisp
Scheme
Python
CLU
Eiffel
Ada
Dylan
{

6. • Web application framework
written in Ruby
• “Ruby” on “Rails”
• David Heinemeier Hansson
(DHH)
• Extracted from 37Signal’s
Basecamp in 2004

7. • Open Source
• Currently maintained by
Rails Core Team
• git://github.com/rails/rails
• Latest version: 3.0.1

8. No more confusion!
http://www.flickr.com/photos/ecstaticist/2589723846/

9. 2. Simple syntax

17. Too Easy!
http://www.flickr.com/photos/clairity/143368932/

18. 3. Pure Object-Oriented

19. Everything in Ruby
is Object

20. No Primitive

22. Even nil ...

24. ... and class!

26. http://www.flickr.com/photos/gastev/2630867950/
Related to duck!

27. 4. No method call

28. “Message sending”

31. http://www.flickr.com/photos/headlouse/1484615917/

32. 5. Mixin

33. Module

34. Module
• Collection of methods and constants
• Not-instanciatable
• But callable
• Append features upon included

35. Multiple inheritance
is very bad

36. Mixin
• Include methods you want from another
module
• No limit of how many modules you include

38. { 6. }
(block)

39. “Closure”

40. Ruby’s Block
• Passing a block as argument
• Method “yield” or “call” the block
• May passing a object as argument
• Result from the block goes back to the
method

42. 7. We love duck
http://www.flickr.com/photos/ymorimo/3975152607/

43. Duck typing
• If it quacks like a duck, it’s a duck!
• Check for object’s property, not interface

46. Duck Punching!

47. Duck Punching
(Monkey patch)
• Objects and class are open
• Add method to object even at Runtime!
• Not really recommend, less maintainability,
might break some stuff
• But it’s awesome

49. 8. Testing is
FFFF**...
(FFFFUUNNN)

50. Encourage testing

51. Testing ...
• Ensure everything still works after you
make change to something else
• Save you ass from client’s call at 3AM
• Test driven development
• Write test – watch it fails – write just
enough code to make it pass – refactor

52. Testing tools
• RSpec
• Cucumber
• Test::Unit
• Rack::Test

54. 9. RubyGems

55. Libraries in Ruby

56. http://rubygems.org

57. Gem
• Library written under Ruby or C
• Packaged by owner and upload to
RubyGems.org
• Easy to install, just
gem install gem_name

58. 10. IT’S FUN!

59. Question?
Thank you!
Prem Sichanugrist
@sikachu
http://sikachu.com
3.9454 in
Beautiful Software