The document discusses the Ruby programming language, noting that it was created in 1995 by Yukihiro Matsumoto and has since grown in popularity with numerous frameworks and libraries like Ruby on Rails. It highlights several key features of Ruby including its syntax, object model with mixins, blocks and iterators, and emphasis on productivity with practices like test-driven development.

1. Why not Ruby?
Ruby
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2. Ruby
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3. Ruby
(Matz)
RubyConf, RubyKaigi, Asakusa.rb, etc...
(26,359 gems, and others)
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4. Ruby on Rails, Sinatra, Web
Ruby(MatzRuby,YARV), JRuby, MacRuby,
IronRuby, ...
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5. :
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6. (ex. CONST, String)
$ (ex. $:, $stdin)
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7. :
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8. ←
↓
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9. ↑
↓
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10. mix-in (cf. )
( )
Java Interface
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12. 2011 8 4

13. ( )
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14. (auto-close )
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15. ( )
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16. ex)
ex)
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18. TDD Test Driven Development
"Test First ( )"
Test::Unit ( )
RSpec (DSL )
BDD Cucumber, Steak
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19. RSpec
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20. RSpec
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23. DRY(Don't Repeat Yourself)
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