Struct declaration syntax in Swift - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is a struct in Swift?

A struct is a way to group related data and functions together. It is a custom data type that can hold properties and methods.

beginner

How do you declare a simple struct named Person with a name property of type String?

You write:<br>

struct Person {
    var name: String
}

intermediate

Can structs in Swift have functions inside them? How?

Yes, structs can have functions called methods. You define them inside the struct like this:<br>

struct Person {
    var name: String
    func greet() {
        print("Hello, \(name)!")
    }
}

beginner

What keyword do you use to create a new instance of a struct?

You use the struct's name followed by parentheses with any required parameters. For example:<br><pre>let person = Person(name: "Alice")</pre>

intermediate

Are structs in Swift value types or reference types? What does that mean?

Structs are value types. This means when you assign or pass a struct, you get a copy, not a reference to the original. Changes to the copy do not affect the original.

Which keyword is used to declare a struct in Swift?

A struct

B class

C enum

D type

The keyword struct is used to declare a struct in Swift.

How do you define a property inside a struct?

A var propertyName: Type

B propertyName = Type

C let propertyName Type

D def propertyName: Type

Properties inside structs are declared with var or let followed by the property name and type, like var name: String.

What happens when you assign one struct instance to another variable?

A The original struct is deleted

B Both variables point to the same instance

C An error occurs

D A copy of the struct is created

Structs are value types, so assigning them creates a copy.

Which of these can a Swift struct contain?

A Only properties

B Properties and methods

C Only methods

D Neither properties nor methods

Structs can contain both properties (data) and methods (functions).

How do you create a new instance of a struct named Car with a property model?

A var car = Car.model("Tesla")

B let car = new Car("Tesla")

C let car = Car(model: "Tesla")

D Car car = Car("Tesla")

You create a new instance by calling the struct's initializer with the property name and value.

Explain how to declare a struct in Swift and include a property and a method.

Think about grouping data and behavior inside one block.

Describe the difference between structs and classes in Swift regarding value and reference types.

Focus on how data is copied or shared.