Analysis

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Abstract FactoryAdapterBridgeBuilderChain of ResponsibilityCommandCompositeDecoratorFacadeFactory MethodFlyweightInterpreterIteratorMediatorMementoObserverPrototypeProxySingletonStateStrategyTemplate MethodVisitor

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Analysis

Pattern comparison

Reviewing 3 patterns.

Criteria
structuralProxyView pattern
behavioralStateView pattern
behavioralStrategyView pattern
Basics
Categorystructuralbehavioralbehavioral
Summary———
IntentProvide a surrogate or placeholder for another object to control access to it.Allow an object to alter its behavior when its internal state changes by delegating state-specific behavior to separate state objects.Encapsulate a family of algorithms or behaviors behind a common contract so they can be selected and swapped cleanly.
Decision factors
ProblemA client needs to interact with an object indirectly because the real object may be expensive, sensitive, or remote.An object behaves differently depending on its internal state, and conditional logic is becoming hard to manage.A system needs to switch between interchangeable behaviors without hardcoding branching logic everywhere.
Tradeoffs
  • Adds another layer of indirection
  • Can make the design more complex when the extra control is unnecessary
  • Can introduce many small classes if the state graph is large
  • State transitions may become harder to trace if spread across multiple classes
  • Adds more moving parts than a direct conditional approach
  • Works best when behavior variations are real and likely to grow
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
  • Web
  • Backend
  • Mobile
  • UI kits
  • Cross-platform systems
  • Web
  • Backend
  • Mobile
  • UI kits
  • Cross-platform systems
  • Web
  • Backend
  • Services
Integration notesProxy is useful for lazy loading, access control, caching, logging, and remote service wrappers.State is useful for workflows, media players, order lifecycles, and any domain where behavior changes as the object moves through a lifecycle.Strategies can cross codebases through shared contracts, API selection rules, or runtime configuration.