Analysis

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Abstract FactoryAdapterBridgeBuilderChain of ResponsibilityCommandCompositeDecoratorFacadeFactory MethodFlyweightInterpreterIteratorMediatorMementoObserverPrototypeProxySingletonStateStrategyTemplate MethodVisitor

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Analysis

Pattern comparison

Reviewing 3 patterns.

Criteria
creationalAbstract FactoryView pattern
structuralCompositeView pattern
structuralDecoratorView pattern
Basics
Categorycreationalstructuralstructural
SummaryProvide an interface for creating families of related objects without specifying their concrete classes.Compose objects into tree structures to represent part-whole hierarchies and let clients work with individual and composite objects through the same interface.Wrap an object with other objects that implement the same contract so responsibilities can be layered dynamically.
IntentProvide an interface for creating families of related objects without specifying their concrete classes.Compose objects into tree structures to represent part-whole hierarchies and let clients work with individual and composite objects through the same interface.Wrap an object with other objects that implement the same contract so responsibilities can be layered dynamically.
Decision factors
ProblemClient code needs to create families of related objects, but hardcoding concrete classes makes the code rigid and hard to swap.A system needs to treat individual objects and groups of objects uniformly, but the hierarchy becomes difficult to manage with separate code paths.A system needs to add optional behaviors to an object without creating many subclasses for every feature combination.
Tradeoffs
  • Adds an extra abstraction layer.
  • Can overcomplicate simple object creation.
  • Makes family-wide swapping and consistency much easier.
  • Can make the design more abstract and harder to follow.
  • May require careful handling of operations that only apply to some nodes in the tree.
  • Makes recursive tree operations and client code much simpler.
  • Can introduce many small wrapper classes that are harder to trace in debugging.
  • Ordering of decorators matters, so composition needs to be deliberate.
  • Keeps responsibilities modular and easy to combine.
Practical fit
Languages
  • typescript
  • java
  • python
  • react
  • angular
  • csharp
  • dotnet
  • typescript
  • java
  • python
  • angular
  • react
  • react-native
  • csharp
  • dotnet
  • typescript
  • java
  • python
  • angular
  • react
  • react-native
  • csharp
  • dotnet
Platforms
  • applications
  • ui systems
  • integration layers
  • web
  • backend
  • mobile
  • ui kits
  • cross-platform systems
  • frontend
  • backend
  • services
Integration notesAbstract Factory is especially useful when your app must produce matching sets of related objects for a theme, provider, platform, or pipeline.Composite is useful when a hierarchy of nested objects should expose a common interface, such as files and folders, menus and submenus, org charts, widget trees, or scene graphs.Decorators work well for cross-cutting concerns such as logging, retry, caching, compression, and telemetry because each layer keeps the same interface while adding one concern.