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

Chain of Responsibilitybehavioral
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Iteratorbehavioral
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Singletoncreational
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Criteria	behavioralChain of ResponsibilityView pattern	behavioralIteratorView pattern	creationalSingletonView pattern
Basics
Category	behavioral	behavioral	creational
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.	Ensure a class has only one instance and provide a global access point to it.
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.	A system needs exactly one shared instance of a class, and that instance must be globally accessible without allowing uncontrolled duplication.
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	Can make dependencies harder to test if the singleton is used everywhere May introduce hidden global state that complicates debugging and concurrency
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.	Singleton is useful for centralized services like configuration, logging, caching, and shared application state.