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1. Fighting code smells
Patterns to keep your code DRY

2. Code smells
• Warning signs in the code which indicate
weaknesses in design.
=> slow down development and increase risk of bugs
in future.

3. Code smells
• Duplicated Code

4. Code smells
• Long Method

5. Code smells
• Feature Envy

6. Code smells
• Data clumps

7. Code smells
• Message chains

8. Code smells
• Divergent change

9. Refactoring Patterns
• Extract Method
• Pull up Method
• Form Template Method
• Replace Method with Method Object
• Extract Class

10. Refactoring Patterns
• Demo: http://goo.gl/zpouEN

11. Read more…
• Refactoring: Improving Design of Existing Code - by
Martin Flower
• Refactoring: Ruby Edition - by Jay Fields, Shane
Harvie, Martin Flower and Kent Beck
• http://ghendry.net/refactor.html
• http://sourcemaking.com/refactoring
• Reek: Code smells detector - https://github.com/
troessner/reek

12. About @Vinh Bachsy
• Author: Vinh Bachsy @: bsdvinhuit@gmail.com
• You can follow me at:
• https://plus.google.com/+VinhBachsy
• https://www.facebook.com/vinh.bachsy
• And the Saigon.rb Meetup:
• http://www.meetup.com/saigon-rb/
• https://www.facebook.com/saigonrb