Problem Statement
Which property wrapper would you use when storing view–local mutable state in SwiftUI?
Explanation
The `@State` property wrapper is used to declare internally mutable state for a SwiftUI view structure. When the value changes, the framework recomputes the body of the view. Other wrappers like `@ObservedObject` or `@EnvironmentObject` are used for external or shared model objects. Knowing when to use each is important in interview discussions.