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
creationalBuilderView pattern
behavioralStateView pattern
behavioralVisitorView pattern
Basics
Categorycreationalbehavioralbehavioral
SummaryConstruct a complex object step by step so the same construction process can create different representations.——
IntentSeparate the construction of a complex object from its final representation.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
ProblemConstructing complex objects directly can make required steps, optional values, and validation hard to manage.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
  • Adds more classes or steps to the construction process.
  • Can be overkill for simple objects.
  • Improves clarity when object construction is complex or incremental.
  • 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
  • python
  • java
  • react
  • angular
  • go
  • csharp
  • dotnet
  • typescript
  • java
  • python
  • angular
  • react
  • react-native
  • csharp
  • dotnet
  • typescript
  • java
  • python
  • angular
  • react
  • react-native
  • csharp
  • dotnet
Platforms
  • frontend
  • backend
  • integration
  • Web
  • Backend
  • Mobile
  • UI kits
  • Cross-platform systems
  • Web
  • Backend
  • Mobile
  • UI kits
  • Cross-platform systems
Integration notesBuilder is most useful when construction must happen in controlled steps and the final object has many optional or ordered parts.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.