Analysis

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Abstract FactoryAdapterBridgeBuilderChain of ResponsibilityCommandCompositeDecoratorFacadeFactory MethodFlyweightInterpreterIteratorMediatorMementoObserverPrototypeProxySingletonStateStrategyTemplate MethodVisitor

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Analysis

Pattern comparison

Reviewing 3 patterns.

Criteria
behavioralCommandView pattern
structuralFlyweightView pattern
behavioralIteratorView pattern
Basics
Categorybehavioralstructuralbehavioral
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.Use sharing to support large numbers of fine-grained objects efficiently by separating shared intrinsic state from per-object extrinsic state.Provide a way to access elements of an aggregate sequentially while hiding the underlying representation.
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 system creates a large number of similar objects, but storing all of their state separately uses too much memory.A collection needs to be traversed without exposing how it is stored internally.
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 complexity because state must be split into shared and unshared parts
  • Can be harder to understand when many objects depend on an external context
  • Can add extra classes and abstraction for simple collections
  • May be unnecessary when built-in language iteration is already enough
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
  • Web
  • Backend
  • Mobile
  • UI kits
  • Cross-platform systems
  • 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.Flyweight is useful when thousands or millions of similar objects need to be represented efficiently, such as trees, glyphs, tiles, or UI tokens.Iterator is useful for pagination, custom collections, ordered traversal, and any case where clients should not know the internal data structure.