Analysis

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Abstract FactoryAdapterBridgeBuilderChain of ResponsibilityCommandCompositeDecoratorFacadeFactory MethodFlyweightInterpreterIteratorMediatorMementoObserverPrototypeProxySingletonStateStrategyTemplate MethodVisitor

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Analysis

Pattern comparison

Reviewing 3 patterns.

Criteria
creationalPrototypeView pattern
structuralProxyView pattern
behavioralTemplate MethodView pattern
Basics
Categorycreationalstructuralbehavioral
Summary———
IntentSpecify the kinds of objects to create using a prototypical instance, and create new objects by cloning that prototype.Provide a surrogate or placeholder for another object to control access to it.Define the skeleton of an algorithm in a base class and let subclasses override selected steps without changing the overall structure.
Decision factors
ProblemCreating new objects from scratch can be expensive or repetitive when the system needs many similar variants.A client needs to interact with an object indirectly because the real object may be expensive, sensitive, or remote.Several classes share the same algorithm structure, but some steps need to vary between implementations.
Tradeoffs
  • Can be difficult if the object graph contains deep references that need custom clone behavior
  • May require careful handling of mutable state to avoid shared-reference bugs
  • Adds another layer of indirection
  • Can make the design more complex when the extra control is unnecessary
  • Relies on inheritance, which can be less flexible than composition in some designs
  • May create a deep class hierarchy if many variations are needed
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
  • Web
  • Backend
  • Mobile
  • UI kits
  • Cross-platform systems
  • Web
  • Backend
  • Mobile
  • UI kits
  • Cross-platform systems
  • Web
  • Backend
  • Mobile
  • UI kits
  • Cross-platform systems
Integration notesPrototype is useful when object creation is expensive, when many near-identical objects are needed, or when cloning preconfigured templates is simpler than rebuilding them.Proxy is useful for lazy loading, access control, caching, logging, and remote service wrappers.Template Method is useful when you have repeated workflows with a common sequence of steps, such as processing orders, generating reports, and importing data.