Protocols define a behavioral contract and support composition; class inheritance reuses implementation through a reference-type hierarchy. ```swift protocol Payable { func pay() } struct Invoice: Payable { func pay() { /* ... */ } } class BaseController { } final class CheckoutController: BaseController { } ``` Prefer protocol composition and structs for decoupling and value semantics. Use class inheritance when shared reference identity or inherited implementation is genuinely required, and...
Scanned 9/5/2026
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Protocols define a behavioral contract and support composition; class inheritance reuses implementation through a reference-type hierarchy.
```swift
protocol Payable { func pay() }
struct Invoice: Payable {
func pay() { /* ... */ }
}
class BaseController { }
final class CheckoutController: BaseController { }
```
Prefer protocol composition and structs for decoupling and value semantics. Use class inheritance when shared reference identity or inherited implementation is genuinely required, and mark classes `final` when they are not designed for subclassing.
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