Analysis

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Abstract FactoryAdapterBridgeBuilderChain of ResponsibilityCommandCompositeDecoratorFacadeFactory MethodFlyweightInterpreterIteratorMediatorMementoObserverPrototypeProxySingletonStateStrategyTemplate MethodVisitor

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Analysis

Pattern comparison

Reviewing 3 patterns.

Criteria
structuralProxyView pattern
behavioralStrategyView pattern
behavioralTemplate MethodView pattern
Basics
Categorystructuralbehavioralbehavioral
Summary———
IntentProvide a surrogate or placeholder for another object to control access to it.Encapsulate a family of algorithms or behaviors behind a common contract so they can be selected and swapped cleanly.Define the skeleton of an algorithm in a base class and let subclasses override selected steps without changing the overall structure.
Decision factors
ProblemA client needs to interact with an object indirectly because the real object may be expensive, sensitive, or remote.A system needs to switch between interchangeable behaviors without hardcoding branching logic everywhere.Several classes share the same algorithm structure, but some steps need to vary between implementations.
Tradeoffs
  • Adds another layer of indirection
  • Can make the design more complex when the extra control is unnecessary
  • Adds more moving parts than a direct conditional approach
  • Works best when behavior variations are real and likely to grow
  • Relies on inheritance, which can be less flexible than composition in some designs
  • May create a deep class hierarchy if many variations are needed
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
  • Services
  • Web
  • Backend
  • Mobile
  • UI kits
  • Cross-platform systems
Integration notesProxy is useful for lazy loading, access control, caching, logging, and remote service wrappers.Strategies can cross codebases through shared contracts, API selection rules, or runtime configuration.Template Method is useful when you have repeated workflows with a common sequence of steps, such as processing orders, generating reports, and importing data.