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
behavioralIteratorView pattern
Basics
Categorycreationalstructuralbehavioral
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.—
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.Provide a way to access elements of an aggregate sequentially while hiding the underlying representation.
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 collection needs to be traversed without exposing how it is stored internally.
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 add extra classes and abstraction for simple collections
  • May be unnecessary when built-in language iteration is already enough
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
  • Web
  • Backend
  • Mobile
  • UI kits
  • Cross-platform systems
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.Iterator is useful for pagination, custom collections, ordered traversal, and any case where clients should not know the internal data structure.