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Chain of Responsibilitybehavioral
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Iteratorbehavioral
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Mediatorbehavioral
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Criteria	behavioralChain of ResponsibilityView pattern	behavioralIteratorView pattern	behavioralMediatorView pattern
Basics
Category	behavioral	behavioral	behavioral
Summary	Pass a request through a sequence of handlers until one handles it or the chain ends.	—	—
Intent	Pass requests along a chain of handlers until one of them handles the request or the request reaches the end of the chain.	Provide a way to access elements of an aggregate sequentially while hiding the underlying representation.	Define an object that encapsulates communication between a set of objects, keeping them from referring to each other directly.
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 collection needs to be traversed without exposing how it is stored internally.	Multiple objects need to coordinate behavior, but direct references between them create tight coupling and complex dependencies.
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 add extra classes and abstraction for simple collections May be unnecessary when built-in language iteration is already enough	The mediator can become large and complex if it takes on too much coordination logic. Centralizing behavior can make the mediator a single point of failure if it is poorly designed.
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	Web Backend Mobile UI kits Cross-platform systems	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.	Iterator is useful for pagination, custom collections, ordered traversal, and any case where clients should not know the internal data structure.	Mediator is useful for chat systems, form coordination, workflow orchestration, and any domain where many components must collaborate without knowing about each other.