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
creationalSingletonView pattern
behavioralStrategyView pattern
behavioralTemplate MethodView pattern
Basics
Categorycreationalbehavioralbehavioral
Summary———
IntentEnsure a class has only one instance and provide a global access point 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 system needs exactly one shared instance of a class, and that instance must be globally accessible without allowing uncontrolled duplication.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
  • Can make dependencies harder to test if the singleton is used everywhere
  • May introduce hidden global state that complicates debugging and concurrency
  • 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 notesSingleton is useful for centralized services like configuration, logging, caching, and shared application state.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.