Tópicos
● O que é refatoração?
● TDD
● Ciclo de refatoração
● Principais problemas
● Code Bad Smells
● Técnicas de refatoração
● Princípios
● Hands-on

O que é refatoração?
● “…is a disciplined technique for restructuring an existing
body of code, altering its internal structure without
changing its external behavior.” Fowler

Principais problemas
● Expressar intenção e finalidade
● Duplicação de código
● Gerenciamento de dependências

Code Bad Smells
“Pedaços de código que estão errados em algum
sentido e que são feios de ver!” Fowler (2009)

Técnicas de refatoração

OO Design Principles
● TDA: Tell, Don't ask!
● DRY: Don't repeat yourself
● LoD: Law of Demeter
● YAGNI: You aren't gonna need it
● KISS: Keep it simple, stupid
● SOLID
● GRASP: General Responsability Assignment Software
Principles

Tell Don't Ask

Don't repeat yourself
Every piece of knowledge must have a single, unambiguous,
authoritative representation within a system.

YAGNI (You Aren't Gonna Need It)

KISS (Keep it Simple, Stupid)

“Understanding responsibilities is key to object-oriented
design” Martin Fowler

Fontes
● Catalog of Refactorings: http://refactoring.com/catalog/
● SourceMaking: https://sourcemaking.com/refactoring
● TellDontAsk: http://martinfowler.com/bliki/TellDontAsk.html
● Dont Repeat Yourself: http://c2.com/cgi/wiki?DontRepeatYourself
● Law Of Demeter: http://c2.com/cgi/wiki/LawOfDemeter?LawOfDemeter
● Yagni: http://martinfowler.com/bliki/Yagni.html
● KISS: https://people.apache.org/~fhanik/kiss.html
● SOLID: http://butunclebob.com/ArticleS.UncleBob.PrinciplesOfOod
● GRASP: http://pt.slideshare.net/raheelarif54/grasp-confiz