Analysis

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Evaluate design patterns side by side across intent, tradeoffs, languages, and integration fit.

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Abstract FactoryAdapterBridgeBuilderChain of ResponsibilityCommandCompositeDecoratorFacadeFactory MethodFlyweightInterpreterIteratorMediatorMementoObserverPrototypeProxySingletonStateStrategyTemplate MethodVisitor

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Analysis

Pattern comparison

Reviewing 3 patterns.

Criteria
creationalBuilderView pattern
structuralCompositeView pattern
behavioralStateView pattern
Basics
Categorycreationalstructuralbehavioral
SummaryConstruct a complex object step by step so the same construction process can create different representations.Compose objects into tree structures to represent part-whole hierarchies and let clients work with individual and composite objects through the same interface.—
IntentSeparate the construction of a complex object from its final representation.Compose objects into tree structures to represent part-whole hierarchies and let clients work with individual and composite objects through the same interface.Allow an object to alter its behavior when its internal state changes by delegating state-specific behavior to separate state objects.
Decision factors
ProblemConstructing complex objects directly can make required steps, optional values, and validation hard to manage.A system needs to treat individual objects and groups of objects uniformly, but the hierarchy becomes difficult to manage with separate code paths.An object behaves differently depending on its internal state, and conditional logic is becoming hard to manage.
Tradeoffs
  • Adds more classes or steps to the construction process.
  • Can be overkill for simple objects.
  • Improves clarity when object construction is complex or incremental.
  • Can make the design more abstract and harder to follow.
  • May require careful handling of operations that only apply to some nodes in the tree.
  • Makes recursive tree operations and client code much simpler.
  • 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
  • python
  • java
  • react
  • angular
  • go
  • 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 notesBuilder is most useful when construction must happen in controlled steps and the final object has many optional or ordered parts.Composite is useful when a hierarchy of nested objects should expose a common interface, such as files and folders, menus and submenus, org charts, widget trees, or scene graphs.State is useful for workflows, media players, order lifecycles, and any domain where behavior changes as the object moves through a lifecycle.