Analysis

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Abstract FactoryAdapterBridgeBuilderChain of ResponsibilityCommandCompositeDecoratorFacadeFactory MethodFlyweightInterpreterIteratorMediatorMementoObserverPrototypeProxySingletonStateStrategyTemplate MethodVisitor

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Analysis

Pattern comparison

Reviewing 3 patterns.

Criteria
structuralBridgeView pattern
structuralProxyView pattern
behavioralTemplate MethodView pattern
Basics
Categorystructuralstructuralbehavioral
SummarySeparate an abstraction from its implementation so the two can vary independently.——
IntentDecouple abstractions from implementations so they can evolve independently.Provide a surrogate or placeholder for another object to control access to it.Define the skeleton of an algorithm in a base class and let subclasses override selected steps without changing the overall structure.
Decision factors
ProblemWhen an abstraction is tightly coupled to its implementation, changing one side forces changes in the other and makes the system harder to evolve.A client needs to interact with an object indirectly because the real object may be expensive, sensitive, or remote.Several classes share the same algorithm structure, but some steps need to vary between implementations.
Tradeoffs
  • Adds an extra layer of indirection.
  • Can increase the number of moving parts.
  • Makes abstractions and implementations easier to evolve independently.
  • Adds another layer of indirection
  • Can make the design more complex when the extra control is unnecessary
  • 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
  • go
  • typescript
  • java
  • python
  • angular
  • react
  • react-native
  • csharp
  • dotnet
  • typescript
  • java
  • python
  • angular
  • react
  • react-native
  • csharp
  • dotnet
Platforms
  • web
  • backend
  • mobile
  • integration
  • ui
  • Web
  • Backend
  • Mobile
  • UI kits
  • Cross-platform systems
  • Web
  • Backend
  • Mobile
  • UI kits
  • Cross-platform systems
Integration notesBridge is useful when you want one stable abstraction while swapping implementations for providers, environments, or device targets.Proxy is useful for lazy loading, access control, caching, logging, and remote service wrappers.Template Method is useful when you have repeated workflows with a common sequence of steps, such as processing orders, generating reports, and importing data.