Memberwise initializer in Swift - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to create a struct with a memberwise initializer.

Swift

struct Person {
    var name: String
    var age: Int
}

let person = Person([1]: "Alice", age: 30)

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

Aage

BPerson

Cname

Dinit

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'age' as the first label instead of 'name'.

Trying to call 'init' explicitly.

The memberwise initializer uses the property names as parameter labels. Here, name is the correct label for the first argument.

2fill in blank

medium

Complete the code to create an instance of the struct using the memberwise initializer.

Swift

struct Car {
    var make: String
    var year: Int
}

let car = Car(make: "Toyota", [1]: 2020)

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

Ayear

Binit

Cmake

Dmodel

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'model' instead of 'year'.

Repeating 'make' as the label.

The memberwise initializer requires the property names as labels. Here, year is the correct label for the second argument.

3fill in blank

hard

Fix the error in the code by completing the memberwise initializer call.

Swift

struct Book {
    var title: String
    var pages: Int
}

let book = Book(title: "Swift Guide", [1]: 250)

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

Apages

Bcount

Clength

Dsize

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'length' or 'size' instead of 'pages'.

Omitting the label for the second argument.

The memberwise initializer uses the property names as labels. The property is called pages, so that label must be used.

4fill in blank

hard

Fill both blanks to create a struct instance using the memberwise initializer.

Swift

struct Rectangle {
    var width: Double
    var height: Double
}

let rect = Rectangle([1]: 10.5, [2]: 20.0)

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

Awidth

Blength

Cheight

Dsize

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'length' or 'size' instead of 'width' or 'height'.

Swapping the labels.

The memberwise initializer uses the property names as labels. The properties are width and height.

5fill in blank

hard

Fill all three blanks to create a struct instance with the memberwise initializer.

Swift

struct Student {
    var name: String
    var grade: Int
    var passed: Bool
}

let student = Student([1]: "John", [2]: 9, [3]: true)

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

Aname

Bgrade

Cpassed

Dscore

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'score' instead of 'grade' or 'passed'.

Mixing up the labels.

The memberwise initializer uses the property names as labels. The properties are name, grade, and passed.