Analysis

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Abstract FactoryAdapterBridgeBuilderChain of ResponsibilityCommandCompositeDecoratorFacadeFactory MethodFlyweightInterpreterIteratorMediatorMementoObserverPrototypeProxySingletonStateStrategyTemplate MethodVisitor

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Analysis

Pattern comparison

Reviewing 3 patterns.

Criteria
behavioralStateView pattern
behavioralStrategyView pattern
behavioralVisitorView pattern
Basics
Categorybehavioralbehavioralbehavioral
Summary———
IntentAllow an object to alter its behavior when its internal state changes by delegating state-specific behavior to separate state objects.Encapsulate a family of algorithms or behaviors behind a common contract so they can be selected and swapped cleanly.Separate an algorithm from the object structure it operates on by moving behavior into visitor objects.
Decision factors
ProblemAn object behaves differently depending on its internal state, and conditional logic is becoming hard to manage.A system needs to switch between interchangeable behaviors without hardcoding branching logic everywhere.You need to perform operations across a set of different object types without stuffing all the logic into the objects themselves.
Tradeoffs
  • Can introduce many small classes if the state graph is large
  • State transitions may become harder to trace if spread across multiple classes
  • Adds more moving parts than a direct conditional approach
  • Works best when behavior variations are real and likely to grow
  • Requires updating the visitor interface when new element types are added
  • Can be awkward if the object structure changes often
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 notesState is useful for workflows, media players, order lifecycles, and any domain where behavior changes as the object moves through a lifecycle.Strategies can cross codebases through shared contracts, API selection rules, or runtime configuration.Visitor is useful for AST processing, reporting, cart calculations, and exporting object structures to alternate formats.