Class declaration syntax in Swift - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is the basic syntax to declare a class in Swift?

Use the <code>class</code> keyword followed by the class name and curly braces. Example:<br><pre>class MyClass {
    // properties and methods
}</pre>

beginner

How do you define a property inside a Swift class?

Inside the class braces, declare a variable or constant using <code>var</code> or <code>let</code>. Example:<br><pre>class Person {
    var name: String
}</pre>

intermediate

How do you create an initializer in a Swift class?

Use the <code>init</code> method inside the class to set up initial values. Example:<br><pre>class Person {
    var name: String
    init(name: String) {
        self.name = name
    }
}</pre>

intermediate

What keyword is used to inherit from another class in Swift?

Use a colon <code>:</code> after the class name followed by the parent class name. Example:<br><pre>class Student: Person {
    var grade: Int
}</pre>

beginner

Can Swift classes have methods? How do you declare one?

Yes, methods are functions inside a class. Declare them with <code>func</code>. Example:<br><pre>class Person {
    func greet() {
        print("Hello!")
    }
}</pre>

Which keyword starts a class declaration in Swift?

A class

B struct

C func

D var

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

How do you indicate that a class inherits from another class?

A Using a colon <code>:</code> after the class name

B Using the <code>extends</code> keyword

C Using the <code>inherits</code> keyword

D Using parentheses <code>()</code> after the class name

In Swift, inheritance is shown by placing a colon : after the class name followed by the parent class.

What is the purpose of the init method in a Swift class?

A To declare a property

B To initialize the class with starting values

C To create a new method

D To inherit from another class

The init method sets up initial values when creating an instance of the class.

Which keyword do you use to define a method inside a Swift class?

A method

B procedure

C def

D func

Swift uses the func keyword to define methods inside classes.

How do you declare a variable property inside a Swift class?

A propertyName: Type

B let propertyName: Type

C var propertyName: Type

D def propertyName: Type

Use var to declare a variable property that can change value.

Explain how to declare a simple class in Swift with one property and an initializer.

Think about how you create a blueprint for an object with starting values.

Describe how inheritance works in Swift class declarations and how to write it in code.

Inheritance means one class gets features from another.