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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 320 of 1,933·9. Behavioral Design PatternsPro lesson

When Visitor Adds vs Removes Flexibility

Recognize when Visitor makes adding operations easy but types hard, versus when simpler approaches maintain better flexibility.

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