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Chain of Responsibilitybehavioral
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Commandbehavioral
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Template Methodbehavioral
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Criteria	behavioralChain of ResponsibilityView pattern	behavioralCommandView pattern	behavioralTemplate MethodView pattern
Basics
Category	behavioral	behavioral	behavioral
Summary	Pass a request through a sequence of handlers until one handles it or the chain ends.	Encapsulate a request as an object so it can be invoked, queued, logged, or undone independently of the receiver that performs the work.	—
Intent	Pass requests along a chain of handlers until one of them handles the request or the request reaches the end of the chain.	Encapsulate a request as an object so it can be invoked, queued, logged, or undone independently of the receiver that performs the work.	Define the skeleton of an algorithm in a base class and let subclasses override selected steps without changing the overall structure.
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 trigger actions without tightly coupling the code that requests an operation to the code that performs it, and it may also need queuing, history, or undo support.	Several classes share the same algorithm structure, but some steps need to vary between implementations.
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.	Introduces extra classes or objects for each action. Can feel heavier than direct method calls when the workflow is simple. Makes requests more flexible, loggable, and replayable.	Relies on inheritance, which can be less flexible than composition in some designs May create a deep class hierarchy if many variations are needed
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 integration	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.	Commands work well for UI actions, background jobs, workflow steps, and undoable operations because invokers can trigger commands without depending on receiver details.	Template Method is useful when you have repeated workflows with a common sequence of steps, such as processing orders, generating reports, and importing data.