Analysis

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Evaluate design patterns side by side across intent, tradeoffs, languages, and integration fit.

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Abstract FactoryAdapterBridgeBuilderChain of ResponsibilityCommandCompositeDecoratorFacadeFactory MethodFlyweightInterpreterIteratorMediatorMementoObserverPrototypeProxySingletonStateStrategyTemplate MethodVisitor

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Analysis

Pattern comparison

Reviewing 3 patterns.

Criteria
behavioralChain of ResponsibilityView pattern
behavioralIteratorView pattern
structuralProxyView pattern
Basics
Categorybehavioralbehavioralstructural
SummaryPass a request through a sequence of handlers until one handles it or the chain ends.——
IntentPass 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.Provide a surrogate or placeholder for another object to control access to it.
Decision factors
ProblemA 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 client needs to interact with an object indirectly because the real object may be expensive, sensitive, or remote.
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
  • Adds another layer of indirection
  • Can make the design more complex when the extra control is unnecessary
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 notesChain 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.Proxy is useful for lazy loading, access control, caching, logging, and remote service wrappers.