Digital Aptech iOS Mobile Application Developer Interview Questions and Answers

Struct is a value type while class is a reference type in Swift.

• Structs are passed by value, while classes are passed by reference.

• Structs are copied when assigned to a new variable, while classes point to the same instance.

• Use structs for simple data types and classes for more complex objects.

To decode optional in Swift, use optional binding or optional chaining.

• Use optional binding with if let or guard let to safely unwrap an optional and assign it to a new variable.

• Use optional chaining with a question mark (?) to access properties, methods, and subscripts of an optional that might currently be nil.