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Design patterns in Swift Ch4: Iterator & Template Method
- 1. Design Patterns in Swift Ch 4 Iterator Template Method Sai Li @ Yowoo Tech. taipingeric@gmail.com 2017/6/9
- 2. Agenda • Iterator • Template Method 2
- 3. 1. Factory Method 2. Strategy 3. Decorator 4. Composite 5. Iterator 6. Template Method 7. Abstract Factory 8. Builder 9. Singleton 10. Proxy 11. Adaptor Kerievsky Joshua: A Learning Guide To Design Patterns 12. Bridge 13. Mediator 14. Observer 15. Chain of Responsibility 16. Memento 17. Command 18. Prototype 19. State 20. Visitor 21. Flyweight 22. Interpreter 23. Facade Kerievsky Joshua: A Learning Guide To Design Patterns
- 4. purpose creational structural behavioral scope class Factory Method Adaptor Interpreter Template Method object Abstract Factory Builder Prototype Singleton Adapter Bridge Composite Decorator Facade Flyweight Proxy Chain of Responsibility Command Iterator Mediator Memento Observer State Strategy Visitor
- 5. Iterator
- 6. Iterator - Intent Provide a way to access the elements of an aggregate object sequentially without exposing its underlying representation 毋須知曉聚合物件的內部細節，即可依序存取內含的 每⼀一個元素 A.K.A: Cursor 6
- 7. Iterator • Accessing inner elements without exposing internal structure • Extract accessing and traversal responsibility to Iterator 7
- 9. accessing interface 1. accessing implementation 2. current index create iterator interface create iterator implementation
- 12. Swift Sequence • for - in • map • reduce • filter • forEach • … 12 Array Dictionary Set
- 13. 1. Factory Method 2. Strategy 3. Decorator 4. Composite 5. Iterator 6. Template Method 7. Abstract Factory 8. Builder 9. Singleton 10. Proxy 11. Adaptor Kerievsky Joshua: A Learning Guide To Design Patterns 12. Bridge 13. Mediator 14. Observer 15. Chain of Responsibility 16. Memento 17. Command 18. Prototype 19. State 20. Visitor 21. Flyweight 22. Interpreter 23. Facade Kerievsky Joshua: A Learning Guide To Design Patterns
- 14. purpose creational structural behavioral scope class Factory Method Adaptor Interpreter Template Method object Abstract Factory Builder Prototype Singleton Adapter Bridge Composite Decorator Facade Flyweight Proxy Chain of Responsibility Command Iterator Mediator Memento Observer State Strategy Visitor
- 15. Template Method
- 16. Template Method - Intent Define the skeleton of an algorithm in an operation, deferring some steps to subclasses. Template Method lets subclasses redefine certain steps of an algorithm without changing the algorithm’s structure 定義演算法的輪輪廓，某些步驟留留給⼦子類別填補，以便便 在不改變演算法整體構造的情況下讓⼦子類別去精煉某 些步驟 16
- 18. Application
- 19. 1. Implement TemplateMehtod, define skeleton of an algorithm 2. define abstract primitive operations implement the primitive operations
- 20. Template Method • implement invariant once, leave the variant to subclass to implement • Extract common behavior to avoid duplication (refactor to generalize) • Program by difference • Hook Operation 20
- 21. Caller Concrete Operation Concrete Operation Abstract Operation Abstract Operation Interface Concrete Operation Concrete Operation Implementation
- 23. Hook Operation 23 Hollywood Pattern: Don’t call me, I’ll call you
- 24. Template Method vs. Strategy 24 Inheritance Delegate
- 27. References • 搞笑談軟⼯工 • Kerievsky Joshua: A Learning Guide To Design Patterns • http://www.evilenglish.net/wp-content/uploads/2014/05/305908d1359615600-madejski-miracle- wtf-shit_640_417_s_c1_center_top_0_0.jpg 27 Q & A