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
behavioralInterpreterView pattern
structuralProxyView pattern
creationalSingletonView pattern
Basics
Categorybehavioralstructuralcreational
Summary———
IntentRepresent grammar rules as objects and interpret sentences by evaluating an abstract syntax tree or expression chain.Provide 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.
Decision factors
ProblemYou need to define a small language or expression grammar and evaluate it consistently across the application.A 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.
Tradeoffs
  • Can become complex if the grammar grows too large.
  • Best suited to small, well-defined languages or expression sets.
  • 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
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 notesInterpreter is useful for calculators, rule engines, simple DSLs, and command parsing systems where a structured grammar must be evaluated.Proxy 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.