Analysis

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Abstract FactoryAdapterBridgeBuilderChain of ResponsibilityCommandCompositeDecoratorFacadeFactory MethodFlyweightInterpreterIteratorMediatorMementoObserverPrototypeProxySingletonStateStrategyTemplate MethodVisitor

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Analysis

Pattern comparison

Reviewing 3 patterns.

Criteria
structuralFacadeView pattern
creationalFactory MethodView pattern
creationalSingletonView pattern
Basics
Categorystructuralcreationalcreational
SummaryProvide a simplified high-level interface that coordinates a complex subsystem behind a smaller and easier-to-use API.——
IntentProvide a simplified high-level interface that coordinates a complex subsystem behind a smaller and easier-to-use API.Define a creation method behind a common interface so specialized creators can decide which concrete product to instantiate without changing the surrounding workflow.Ensure a class has only one instance and provide a global access point to it.
Decision factors
ProblemA client needs to perform a recurring workflow that spans several subsystem classes, but direct coordination makes the code noisy and tightly coupled.A workflow needs to create one of several related concrete objects, but constructing them directly in client code spreads creation logic and tightly couples the caller to specific implementations.A system needs exactly one shared instance of a class, and that instance must be globally accessible without allowing uncontrolled duplication.
Tradeoffs
  • Can become a dumping ground if boundaries are unclear.
  • May obscure useful lower-level capabilities from advanced consumers.
  • Simplifies the most common entry points for the system.
  • Adds extra indirection and more types compared with direct construction
  • Can feel unnecessarily abstract when object creation is simple and unlikely to vary
  • Can make dependencies harder to test if the singleton is used everywhere
  • May introduce hidden global state that complicates debugging and concurrency
Practical fit
Languages
  • typescript
  • java
  • python
  • angular
  • react
  • react-native
  • csharp
  • dotnet
  • typescript
  • java
  • python
  • angular
  • react
  • react-native
  • csharp
  • dotnet
  • typescript
  • java
  • python
  • angular
  • react
  • react-native
  • csharp
  • dotnet
Platforms
  • applications
  • apis
  • service layers
  • Applications
  • APIs
  • Frameworks
  • Service layers
  • Web
  • Backend
  • Mobile
  • UI kits
  • Cross-platform systems
Integration notesFacades are useful when exposing a stable boundary over a multi-service or mixed-language backend, or when presenting a consistent UI entry point over multiple readiness checks.Factory Method is useful when framework hooks, integrations, or environment-specific workflows need to create interchangeable implementations behind a stable contract.Singleton is useful for centralized services like configuration, logging, caching, and shared application state.