Analysis

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Abstract FactoryAdapterBridgeBuilderChain of ResponsibilityCommandCompositeDecoratorFacadeFactory MethodFlyweightInterpreterIteratorMediatorMementoObserverPrototypeProxySingletonStateStrategyTemplate MethodVisitor

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Analysis

Pattern comparison

Reviewing 3 patterns.

Criteria
structuralBridgeView pattern
behavioralCommandView pattern
structuralCompositeView pattern
Basics
Categorystructuralbehavioralstructural
SummarySeparate an abstraction from its implementation so the two can vary independently.Encapsulate a request as an object so it can be invoked, queued, logged, or undone independently of the receiver that performs the work.Compose objects into tree structures to represent part-whole hierarchies and let clients work with individual and composite objects through the same interface.
IntentDecouple abstractions from implementations so they can evolve independently.Encapsulate a request as an object so it can be invoked, queued, logged, or undone independently of the receiver that performs the work.Compose objects into tree structures to represent part-whole hierarchies and let clients work with individual and composite objects through the same interface.
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.A system needs to trigger actions without tightly coupling the code that requests an operation to the code that performs it, and it may also need queuing, history, or undo support.A system needs to treat individual objects and groups of objects uniformly, but the hierarchy becomes difficult to manage with separate code paths.
Tradeoffs
  • Adds an extra layer of indirection.
  • Can increase the number of moving parts.
  • Makes abstractions and implementations easier to evolve independently.
  • Introduces extra classes or objects for each action.
  • Can feel heavier than direct method calls when the workflow is simple.
  • Makes requests more flexible, loggable, and replayable.
  • 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.
Practical fit
Languages
  • typescript
  • java
  • python
  • angular
  • react
  • react-native
  • csharp
  • dotnet
  • go
  • typescript
  • java
  • python
  • angular
  • react
  • react-native
  • csharp
  • dotnet
  • typescript
  • java
  • python
  • angular
  • react
  • react-native
  • csharp
  • dotnet
Platforms
  • web
  • backend
  • mobile
  • integration
  • ui
  • frontend
  • backend
  • integration
  • web
  • backend
  • mobile
  • ui kits
  • cross-platform systems
Integration notesBridge is useful when you want one stable abstraction while swapping implementations for providers, environments, or device targets.Commands work well for UI actions, background jobs, workflow steps, and undoable operations because invokers can trigger commands without depending on receiver details.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.