Analysis

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Abstract FactoryAdapterBridgeBuilderChain of ResponsibilityCommandCompositeDecoratorFacadeFactory MethodFlyweightInterpreterIteratorMediatorMementoObserverPrototypeProxySingletonStateStrategyTemplate MethodVisitor

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Analysis

Pattern comparison

Reviewing 3 patterns.

Criteria
behavioralMementoView pattern
behavioralStateView pattern
behavioralStrategyView pattern
Basics
Categorybehavioralbehavioralbehavioral
Summary———
IntentCapture and externalize an object's state so it can be restored to a previous point in time.Allow an object to alter its behavior when its internal state changes by delegating state-specific behavior to separate state objects.Encapsulate a family of algorithms or behaviors behind a common contract so they can be selected and swapped cleanly.
Decision factors
ProblemAn object's internal state must be saved and restored later without exposing its implementation details.An object behaves differently depending on its internal state, and conditional logic is becoming hard to manage.A system needs to switch between interchangeable behaviors without hardcoding branching logic everywhere.
Tradeoffs
  • Snapshots can consume memory if many states are stored.
  • Care must be taken to keep mementos immutable and hidden from outside code.
  • Can introduce many small classes if the state graph is large
  • State transitions may become harder to trace if spread across multiple classes
  • Adds more moving parts than a direct conditional approach
  • Works best when behavior variations are real and likely to grow
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
  • Services
Integration notesMemento is useful for undo/redo, checkpoints, draft recovery, and any workflow where state history matters.State is useful for workflows, media players, order lifecycles, and any domain where behavior changes as the object moves through a lifecycle.Strategies can cross codebases through shared contracts, API selection rules, or runtime configuration.