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

Criteria	behavioralIteratorView pattern	creationalSingletonView pattern
Basics
Category	behavioral	creational
Summary	—	—
Intent	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 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	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
Platforms	Web Backend Mobile UI kits Cross-platform systems	Web Backend Mobile UI kits Cross-platform systems
Integration notes	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.