Design Patterns
Behavioral Patterns
How objects communicate — assign responsibilities and encapsulate algorithms.
Coming soon: Behavioral patterns introduction.
Observer
- Notify dependents of state changes
- Tier 1 · Foundational
Strategy
- Encapsulate interchangeable algorithms
- Tier 1 · Foundational
Command
- Encapsulate a request as an object
- Tier 2 · Intermediate
Template Method
- Define algorithm skeleton, defer steps
- Tier 2 · Foundational
Chain of Responsibility
- Pass request along a chain of handlers
- Tier 3 · Intermediate
State
- Alter behavior when internal state changes
- Tier 2 · Intermediate
Mediator
- Centralize complex communications
- Tier 3 · Intermediate
Iterator
- Access elements sequentially
- Tier 2 · Foundational
Visitor
- Add operations without changing classes
- Tier 3 · Advanced
Memento
- Capture and restore object state
- Tier 3 · Intermediate
Interpreter
- Define a grammar and interpret sentences
- Tier 3 · Advanced