Fighting code smellsPatterns to keep your code DRY

Code smells• Warning signs in the code which indicate

weaknesses in design.

=> slow down development and increase risk of bugs in future.

Code smells• Duplicated Code

Code smells• Long Method

Code smells• Feature Envy

Code smells• Data clumps

Code smells• Message chains

Code smells• Divergent change

Refactoring Patterns• Extract Method

• Pull up Method

• Form Template Method

• Replace Method with Method Object

• Extract Class

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

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

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