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
behavioralStateView 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.Allow an object to alter its behavior when its internal state changes by delegating state-specific behavior to separate state objects.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.An object behaves differently depending on its internal state, and conditional logic is becoming hard to manage.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.
  • Can introduce many small classes if the state graph is large
  • State transitions may become harder to trace if spread across multiple classes
  • 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
  • Mobile
  • UI kits
  • Cross-platform systems
  • 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.State is useful for workflows, media players, order lifecycles, and any domain where behavior changes as the object moves through a lifecycle.Visitor is useful for AST processing, reporting, cart calculations, and exporting object structures to alternate formats.