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
behavioralMediatorView pattern
behavioralStrategyView pattern
behavioralVisitorView pattern
Basics
Categorybehavioralbehavioralbehavioral
Summary———
IntentDefine an object that encapsulates communication between a set of objects, keeping them from referring to each other directly.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
ProblemMultiple objects need to coordinate behavior, but direct references between them create tight coupling and complex dependencies.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
  • The mediator can become large and complex if it takes on too much coordination logic.
  • Centralizing behavior can make the mediator a single point of failure if it is poorly designed.
  • 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 notesMediator is useful for chat systems, form coordination, workflow orchestration, and any domain where many components must collaborate without knowing about each other.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.