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
structuralDecoratorView pattern
behavioralStateView pattern
behavioralTemplate MethodView pattern
Basics
Categorystructuralbehavioralbehavioral
SummaryWrap an object with other objects that implement the same contract so responsibilities can be layered dynamically.——
IntentWrap an object with other objects that implement the same contract so responsibilities can be layered dynamically.Allow an object to alter its behavior when its internal state changes by delegating state-specific behavior to separate state objects.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 to add optional behaviors to an object without creating many subclasses for every feature combination.An object behaves differently depending on its internal state, and conditional logic is becoming hard to manage.Several classes share the same algorithm structure, but some steps need to vary between implementations.
Tradeoffs
  • Can introduce many small wrapper classes that are harder to trace in debugging.
  • Ordering of decorators matters, so composition needs to be deliberate.
  • Keeps responsibilities modular and easy to combine.
  • Can introduce many small classes if the state graph is large
  • State transitions may become harder to trace if spread across multiple classes
  • 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
  • frontend
  • backend
  • services
  • Web
  • Backend
  • Mobile
  • UI kits
  • Cross-platform systems
  • Web
  • Backend
  • Mobile
  • UI kits
  • Cross-platform systems
Integration notesDecorators work well for cross-cutting concerns such as logging, retry, caching, compression, and telemetry because each layer keeps the same interface while adding one concern.State is useful for workflows, media players, order lifecycles, and any domain where behavior changes as the object moves through a lifecycle.Template Method is useful when you have repeated workflows with a common sequence of steps, such as processing orders, generating reports, and importing data.