Why classes exist alongside structs in Swift - Quick Recap

Recall & Review

beginner

What is a key difference between classes and structs in Swift?

Classes support inheritance and reference semantics, while structs do not. Structs have value semantics, meaning each copy is independent.

beginner

Why do classes exist alongside structs in Swift?

Classes exist to provide features like inheritance, reference sharing, and deinitializers, which structs do not support.

beginner

What does it mean that structs have value semantics?

Value semantics means when you assign or pass a struct, a copy is made. Changes to one copy do not affect others.

beginner

What is a real-life example to understand reference semantics of classes?

Think of a class instance like a shared remote control. Multiple people can use the same remote (reference), so changes affect all users.

beginner

Can structs in Swift have methods and properties?

Yes, structs can have methods and properties, but they cannot inherit from other types or have deinitializers.

Which feature is unique to classes in Swift?

A Having properties

B Inheritance

C Being able to create instances

D Having methods

Only classes support inheritance; structs do not.

What happens when you assign a struct to a new variable?

A The struct becomes immutable

B Both variables point to the same instance

C The original struct is deleted

D A new copy is created

Structs have value semantics, so assignment creates a copy.

Which of these is true about classes in Swift?

A They have reference semantics

B They always create copies on assignment

C They cannot have methods

D They cannot have properties

Classes use reference semantics, so variables share the same instance.

Why might you choose a struct over a class?

A You want independent copies

B You need inheritance

C You want shared state

D You need deinitializers

Structs are good when you want each copy to be independent.

Which feature do structs NOT support?

A Methods

B Properties

C Deinitializers

D Initializers

Structs cannot have deinitializers; only classes can.

Explain why Swift has both classes and structs. What are the main differences and when would you use each?

Think about how data is shared or copied in your program.

Describe a real-life example that helps understand the difference between reference and value semantics in Swift.

Use everyday objects to explain how data sharing works.