Analysis

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Abstract FactoryAdapterBridgeBuilderChain of ResponsibilityCommandCompositeDecoratorFacadeFactory MethodFlyweightInterpreterIteratorMediatorMementoObserverPrototypeProxySingletonStateStrategyTemplate MethodVisitor

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Analysis

Pattern comparison

Reviewing 3 patterns.

Criteria
behavioralCommandView pattern
creationalFactory MethodView pattern
behavioralStateView pattern
Basics
Categorybehavioralcreationalbehavioral
SummaryEncapsulate a request as an object so it can be invoked, queued, logged, or undone independently of the receiver that performs the work.——
IntentEncapsulate a request as an object so it can be invoked, queued, logged, or undone independently of the receiver that performs the work.Define a creation method behind a common interface so specialized creators can decide which concrete product to instantiate without changing the surrounding workflow.Allow an object to alter its behavior when its internal state changes by delegating state-specific behavior to separate state objects.
Decision factors
ProblemA 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 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.An object behaves differently depending on its internal state, and conditional logic is becoming hard to manage.
Tradeoffs
  • 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.
  • Adds extra indirection and more types compared with direct construction
  • Can feel unnecessarily abstract when object creation is simple and unlikely to vary
  • 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
  • frontend
  • backend
  • integration
  • Applications
  • APIs
  • Frameworks
  • Service layers
  • Web
  • Backend
  • Mobile
  • UI kits
  • Cross-platform systems
Integration notesCommands work well for UI actions, background jobs, workflow steps, and undoable operations because invokers can trigger commands without depending on receiver details.Factory Method is useful when framework hooks, integrations, or environment-specific workflows need to create interchangeable implementations behind a stable contract.State is useful for workflows, media players, order lifecycles, and any domain where behavior changes as the object moves through a lifecycle.