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
behavioralMementoView pattern
structuralProxyView pattern
Basics
Categorycreationalbehavioralstructural
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.Capture and externalize an object's state so it can be restored to a previous point in time.Provide a surrogate or placeholder for another object to control access to it.
Decision factors
ProblemConstructing complex objects directly can make required steps, optional values, and validation hard to manage.An object's internal state must be saved and restored later without exposing its implementation details.A client needs to interact with an object indirectly because the real object may be expensive, sensitive, or remote.
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.
  • Snapshots can consume memory if many states are stored.
  • Care must be taken to keep mementos immutable and hidden from outside code.
  • Adds another layer of indirection
  • Can make the design more complex when the extra control is unnecessary
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.Memento is useful for undo/redo, checkpoints, draft recovery, and any workflow where state history matters.Proxy is useful for lazy loading, access control, caching, logging, and remote service wrappers.