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
behavioralIteratorView pattern
behavioralVisitorView pattern
Basics
Categorycreationalbehavioralbehavioral
SummaryProvide an interface for creating families of related objects without specifying their concrete classes.——
IntentProvide an interface for creating families of related objects without specifying their concrete classes.Provide a way to access elements of an aggregate sequentially while hiding the underlying representation.Separate an algorithm from the object structure it operates on by moving behavior into visitor objects.
Decision factors
ProblemClient code needs to create families of related objects, but hardcoding concrete classes makes the code rigid and hard to swap.A collection needs to be traversed without exposing how it is stored internally.You need to perform operations across a set of different object types without stuffing all the logic into the objects themselves.
Tradeoffs
  • Adds an extra abstraction layer.
  • Can overcomplicate simple object creation.
  • Makes family-wide swapping and consistency much easier.
  • Can add extra classes and abstraction for simple collections
  • May be unnecessary when built-in language iteration is already enough
  • 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
  • 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.Iterator is useful for pagination, custom collections, ordered traversal, and any case where clients should not know the internal data structure.Visitor is useful for AST processing, reporting, cart calculations, and exporting object structures to alternate formats.