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
structuralProxyView pattern
creationalSingletonView pattern
behavioralStateView pattern
Basics
Categorystructuralcreationalbehavioral
Summary———
IntentProvide a surrogate or placeholder for another object to control access to it.Ensure a class has only one instance and provide a global access point to it.Allow an object to alter its behavior when its internal state changes by delegating state-specific behavior to separate state objects.
Decision factors
ProblemA client needs to interact with an object indirectly because the real object may be expensive, sensitive, or remote.A system needs exactly one shared instance of a class, and that instance must be globally accessible without allowing uncontrolled duplication.An object behaves differently depending on its internal state, and conditional logic is becoming hard to manage.
Tradeoffs
  • Adds another layer of indirection
  • Can make the design more complex when the extra control is unnecessary
  • Can make dependencies harder to test if the singleton is used everywhere
  • May introduce hidden global state that complicates debugging and concurrency
  • Can introduce many small classes if the state graph is large
  • State transitions may become harder to trace if spread across multiple classes
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
  • Mobile
  • UI kits
  • Cross-platform systems
Integration notesProxy is useful for lazy loading, access control, caching, logging, and remote service wrappers.Singleton is useful for centralized services like configuration, logging, caching, and shared application state.State is useful for workflows, media players, order lifecycles, and any domain where behavior changes as the object moves through a lifecycle.