What is optional, difference between struct and class?

Question

Accepted Answer

Optional is a type in Swift that can hold a value or be nil. Struct and class are both used to define custom data types.

Optional is denoted by a question mark (?) and is used to handle nil values.
Structs are value types and are passed by value, while classes are reference types and are passed by reference.
Structs have a default memberwise initializer, while classes do not.
Classes can inherit from other classes, while structs cannot.
Examples of optional usage include declaring optional variables and using optional chaining.
Examples of struct usage include defining a Point struct with x and y coordinates, while class usage includes defining a Person class with name and age properties.

Popular interview questions of IOS Developer