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287Chain of Responsibility Pattern: Core Concept
288Implementing Chain of Responsibility
289Chain of Responsibility Use Cases
290Command Pattern: Encapsulating Requests
291Implementing the Command Pattern
292Undo and Redo with Command Pattern
293Command Pattern in Modern Applications
294Combining Chain and Command Patterns
295The Iterator Pattern: Traversing Collections
296Implementing Internal vs External Iterators
297Iterator Pattern in Modern Languages
298The Mediator Pattern: Centralizing Communication
299Mediator vs Observer: Choosing the Right Pattern
300Implementing a Dialog or Form Mediator
301The Memento Pattern: Capturing Object State
302Implementing Undo with Memento and Command
303Memento Serialization and Performance Concerns
304The Observer Pattern: Definition and Intent
305Observer Pattern Structure: Subject and Observers
306Implementing Observer: Push vs Pull Models
307Observer Pattern Trade-offs and Pitfalls
308The State Pattern: Definition and Intent
309State Pattern Structure: Context and State Objects
310State Transitions and Encapsulation
311State Pattern vs Conditional Logic
312Strategy Pattern: Encapsulating Algorithms
313Strategy vs State Pattern
314Implementing Strategy with Composition
315Template Method Pattern: Skeleton Algorithms
316Hook Methods in Template Method
317Strategy vs Template Method Trade-offs
318Visitor Pattern: Operations on Object Structures
319Double Dispatch in Visitor Pattern
320When Visitor Adds vs Removes Flexibility
321The Pattern Addiction Anti-Pattern
322When Patterns Become Obstacles
323The Cost of Pattern Overhead
324YAGNI and Pattern Selection
325Simplicity as a Design Goal
326Refactoring Toward and Away from Patterns

287Chain of Responsibility Pattern: Core Concept
288Implementing Chain of Responsibility
289Chain of Responsibility Use Cases
290Command Pattern: Encapsulating Requests
291Implementing the Command Pattern
292Undo and Redo with Command Pattern
293Command Pattern in Modern Applications
294Combining Chain and Command Patterns
295The Iterator Pattern: Traversing Collections
296Implementing Internal vs External Iterators
297Iterator Pattern in Modern Languages
298The Mediator Pattern: Centralizing Communication
299Mediator vs Observer: Choosing the Right Pattern
300Implementing a Dialog or Form Mediator
301The Memento Pattern: Capturing Object State
302Implementing Undo with Memento and Command
303Memento Serialization and Performance Concerns
304The Observer Pattern: Definition and Intent
305Observer Pattern Structure: Subject and Observers
306Implementing Observer: Push vs Pull Models
307Observer Pattern Trade-offs and Pitfalls
308The State Pattern: Definition and Intent
309State Pattern Structure: Context and State Objects
310State Transitions and Encapsulation
311State Pattern vs Conditional Logic
312Strategy Pattern: Encapsulating Algorithms
313Strategy vs State Pattern
314Implementing Strategy with Composition
315Template Method Pattern: Skeleton Algorithms
316Hook Methods in Template Method
317Strategy vs Template Method Trade-offs
318Visitor Pattern: Operations on Object Structures
319Double Dispatch in Visitor Pattern
320When Visitor Adds vs Removes Flexibility
321The Pattern Addiction Anti-Pattern
322When Patterns Become Obstacles
323The Cost of Pattern Overhead
324YAGNI and Pattern Selection
325Simplicity as a Design Goal
326Refactoring Toward and Away from Patterns

Lesson 318 of 1,933·9. Behavioral Design PatternsPro lesson

Visitor Pattern: Operations on Object Structures

Separate algorithms from object structures by letting visitors traverse elements and perform operations without modifying them.

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