Analysis

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Abstract FactoryAdapterBridgeBuilderChain of ResponsibilityCommandCompositeDecoratorFacadeFactory MethodFlyweightInterpreterIteratorMediatorMementoObserverPrototypeProxySingletonStateStrategyTemplate MethodVisitor

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Analysis

Pattern comparison

Reviewing 3 patterns.

Criteria
creationalPrototypeView pattern
creationalSingletonView pattern
behavioralStateView pattern
Basics
Categorycreationalcreationalbehavioral
Summary———
IntentSpecify the kinds of objects to create using a prototypical instance, and create new objects by cloning that prototype.Ensure a class has only one instance and provide a global access point to it.Allow an object to alter its behavior when its internal state changes by delegating state-specific behavior to separate state objects.
Decision factors
ProblemCreating new objects from scratch can be expensive or repetitive when the system needs many similar variants.A system needs exactly one shared instance of a class, and that instance must be globally accessible without allowing uncontrolled duplication.An object behaves differently depending on its internal state, and conditional logic is becoming hard to manage.
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
  • Can make dependencies harder to test if the singleton is used everywhere
  • May introduce hidden global state that complicates debugging and concurrency
  • Can introduce many small classes if the state graph is large
  • State transitions may become harder to trace if spread across multiple classes
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.Singleton is useful for centralized services like configuration, logging, caching, and shared application state.State is useful for workflows, media players, order lifecycles, and any domain where behavior changes as the object moves through a lifecycle.