Analysis

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Abstract FactoryAdapterBridgeBuilderChain of ResponsibilityCommandCompositeDecoratorFacadeFactory MethodFlyweightInterpreterIteratorMediatorMementoObserverPrototypeProxySingletonStateStrategyTemplate MethodVisitor

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Analysis

Pattern comparison

Reviewing 3 patterns.

Criteria
structuralBridgeView pattern
creationalBuilderView pattern
behavioralObserverView pattern
Basics
Categorystructuralcreationalbehavioral
SummarySeparate an abstraction from its implementation so the two can vary independently.Construct a complex object step by step so the same construction process can create different representations.—
IntentDecouple abstractions from implementations so they can evolve independently.Separate the construction of a complex object from its final representation.Define a subscription mechanism so multiple observers can react to subject events without the subject knowing concrete subscriber details.
Decision factors
ProblemWhen an abstraction is tightly coupled to its implementation, changing one side forces changes in the other and makes the system harder to evolve.Constructing complex objects directly can make required steps, optional values, and validation hard to manage.A system needs to notify multiple dependent objects when state changes occur, but hardcoding those dependencies makes the design rigid and tightly coupled.
Tradeoffs
  • Adds an extra layer of indirection.
  • Can increase the number of moving parts.
  • Makes abstractions and implementations easier to evolve independently.
  • Adds more classes or steps to the construction process.
  • Can be overkill for simple objects.
  • Improves clarity when object construction is complex or incremental.
  • 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
Practical fit
Languages
  • typescript
  • java
  • python
  • angular
  • react
  • react-native
  • csharp
  • dotnet
  • go
  • typescript
  • python
  • java
  • react
  • angular
  • go
  • csharp
  • dotnet
  • typescript
  • java
  • python
  • angular
  • react
  • react-native
  • csharp
  • dotnet
Platforms
  • web
  • backend
  • mobile
  • integration
  • ui
  • frontend
  • backend
  • integration
  • Web
  • Backend
  • Event-driven systems
Integration notesBridge is useful when you want one stable abstraction while swapping implementations for providers, environments, or device targets.Builder is most useful when construction must happen in controlled steps and the final object has many optional or ordered parts.Observers work well inside a single application boundary for UI events, domain events, and in-process notifications where subscribers change dynamically.