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
behavioralMementoView pattern
creationalSingletonView pattern
behavioralVisitorView pattern
Basics
Categorybehavioralcreationalbehavioral
Summary———
IntentCapture and externalize an object's state so it can be restored to a previous point in time.Ensure a class has only one instance and provide a global access point to it.Separate an algorithm from the object structure it operates on by moving behavior into visitor objects.
Decision factors
ProblemAn object's internal state must be saved and restored later without exposing its implementation details.A system needs exactly one shared instance of a class, and that instance must be globally accessible without allowing uncontrolled duplication.You need to perform operations across a set of different object types without stuffing all the logic into the objects themselves.
Tradeoffs
  • Snapshots can consume memory if many states are stored.
  • Care must be taken to keep mementos immutable and hidden from outside code.
  • Can make dependencies harder to test if the singleton is used everywhere
  • May introduce hidden global state that complicates debugging and concurrency
  • 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 notesMemento is useful for undo/redo, checkpoints, draft recovery, and any workflow where state history matters.Singleton is useful for centralized services like configuration, logging, caching, and shared application state.Visitor is useful for AST processing, reporting, cart calculations, and exporting object structures to alternate formats.