Class declaration syntax in Swift - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to declare a simple class named Car.

Swift

class [1] {
}

Drag options to blanks, or click blank then click option'

AAuto

BCar

Cvehicle

Dcar

Attempts:

3 left

💡 Hint

Common Mistakes

Using lowercase names for the class.

Using a different class name than requested.

The class name should start with a capital letter and match the intended name. Here, Car is the correct class name.

2fill in blank

medium

Complete the code to add a property color of type String inside the class.

Swift

class Vehicle {
    var [1]: String
}

Drag options to blanks, or click blank then click option'

Acolor

Bsize

Cspeed

Dweight

Attempts:

3 left

💡 Hint

Common Mistakes

Using a different property name than color.

Forgetting the colon after the property name.

The property name should be color as requested, with type String.

3fill in blank

hard

Fix the error in the class declaration by completing the missing keyword.

Swift

[1] Car {
    var model: String
}

Drag options to blanks, or click blank then click option'

Aclass

Bfunc

Cstruct

Denum

Attempts:

3 left

💡 Hint

Common Mistakes

Using struct or func instead of class.

Omitting the keyword entirely.

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

4fill in blank

hard

Fill both blanks to declare a class Person with a method greet() that prints a greeting.

Swift

class [1] {
    func [2]() {
        print("Hello!")
    }
}

Drag options to blanks, or click blank then click option'

APerson

Bgreet

CsayHello

DUser

Attempts:

3 left

💡 Hint

Common Mistakes

Using wrong class or method names.

Forgetting parentheses after method name.

The class name should be Person and the method name should be greet as requested.

5fill in blank

hard

Fill all three blanks to declare a class Animal with a property name of type String and an initializer that sets the name.

Swift

class [1] {
    var [2]: String
    init([3]: String) {
        self.name = [3]
    }
}

Drag options to blanks, or click blank then click option'

AAnimal

Bname

Dspecies

Attempts:

3 left

💡 Hint

Common Mistakes

Using different names for property and initializer parameter.

Forgetting to use self to assign the property.

The class name is Animal, the property is name, and the initializer parameter is also name to assign the property.