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
behavioralObserverView pattern
behavioralStrategyView 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.Define a subscription mechanism so multiple observers can react to subject events without the subject knowing concrete subscriber details.Encapsulate a family of algorithms or behaviors behind a common contract so they can be selected and swapped cleanly.
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 notify multiple dependent objects when state changes occur, but hardcoding those dependencies makes the design rigid and tightly coupled.A system needs to switch between interchangeable behaviors without hardcoding branching logic everywhere.
Tradeoffs
  • Adds an extra abstraction layer.
  • Can overcomplicate simple object creation.
  • Makes family-wide swapping and consistency much easier.
  • Notification flows can become hard to trace when many observers react to the same event
  • Observers may receive updates they do not need unless subscriptions are carefully designed
  • 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
  • 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
  • Event-driven systems
  • Web
  • 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.Observers work well inside a single application boundary for UI events, domain events, and in-process notifications where subscribers change dynamically.Strategies can cross codebases through shared contracts, API selection rules, or runtime configuration.