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You can now review the differences across the comparison table below.

Chain of Responsibilitybehavioral
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Factory Methodcreational
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Iteratorbehavioral
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Criteria	behavioralChain of ResponsibilityView pattern	creationalFactory MethodView pattern	behavioralIteratorView pattern
Basics
Category	behavioral	creational	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.	Define a creation method behind a common interface so specialized creators can decide which concrete product to instantiate without changing the surrounding workflow.	Provide a way to access elements of an aggregate sequentially while hiding the underlying representation.
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 workflow needs to create one of several related concrete objects, but constructing them directly in client code spreads creation logic and tightly couples the caller to specific implementations.	A collection needs to be traversed without exposing how it is stored internally.
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.	Adds extra indirection and more types compared with direct construction Can feel unnecessarily abstract when object creation is simple and unlikely to vary	Can add extra classes and abstraction for simple collections May be unnecessary when built-in language iteration is already enough
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	Applications APIs Frameworks Service layers	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.	Factory Method is useful when framework hooks, integrations, or environment-specific workflows need to create interchangeable implementations behind a stable contract.	Iterator is useful for pagination, custom collections, ordered traversal, and any case where clients should not know the internal data structure.