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Chain of Responsibilitybehavioral
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Decoratorstructural
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Mementobehavioral
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Criteria	behavioralChain of ResponsibilityView pattern	structuralDecoratorView pattern	behavioralMementoView pattern
Basics
Category	behavioral	structural	behavioral
Summary	Pass a request through a sequence of handlers until one handles it or the chain ends.	Wrap an object with other objects that implement the same contract so responsibilities can be layered dynamically.	—
Intent	Pass requests along a chain of handlers until one of them handles the request or the request reaches the end of the chain.	Wrap an object with other objects that implement the same contract so responsibilities can be layered dynamically.	Capture and externalize an object's state so it can be restored to a previous point in time.
Decision factors
Problem	A request must pass through multiple possible handlers, but the sender should not need to know which handler will process it.	A system needs to add optional behaviors to an object without creating many subclasses for every feature combination.	An object's internal state must be saved and restored later without exposing its implementation details.
Tradeoffs	Requests can become harder to trace because control flows through multiple handlers. A long chain may add overhead if many handlers are checked on every request. It keeps handler logic isolated and easier to extend.	Can introduce many small wrapper classes that are harder to trace in debugging. Ordering of decorators matters, so composition needs to be deliberate. Keeps responsibilities modular and easy to combine.	Snapshots can consume memory if many states are stored. Care must be taken to keep mementos immutable and hidden from outside code.
Practical fit
Languages	typescript java python angular react react-native csharp dotnet	typescript java python angular react react-native csharp dotnet	typescript java python angular react react-native csharp dotnet
Platforms	frontend backend integration	frontend backend services	Web Backend Mobile UI kits Cross-platform systems
Integration notes	Chain of Responsibility is useful for validation pipelines, support routing, approval flows, and any system where requests may be processed by different handlers in sequence.	Decorators work well for cross-cutting concerns such as logging, retry, caching, compression, and telemetry because each layer keeps the same interface while adding one concern.	Memento is useful for undo/redo, checkpoints, draft recovery, and any workflow where state history matters.