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
structuralBridgeView pattern
behavioralIteratorView pattern
creationalSingletonView pattern
Basics
Categorystructuralbehavioralcreational
SummarySeparate an abstraction from its implementation so the two can vary independently.——
IntentDecouple abstractions from implementations so they can evolve independently.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
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 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
  • Adds an extra layer of indirection.
  • Can increase the number of moving parts.
  • Makes abstractions and implementations easier to evolve independently.
  • 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
  • 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.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.