Memberwise initializer in Swift - Mini Project: Build & Apply

Using Memberwise Initializer in Swift

📖 Scenario: You are creating a simple app to keep track of books in a library. Each book has a title, author, and number of pages.

🎯 Goal: Build a Swift struct called Book and use the memberwise initializer to create book instances easily.

📋 What You'll Learn

Create a struct named Book with properties title, author, and pages

Create a variable firstBook using the memberwise initializer with exact values

Create a variable secondBook using the memberwise initializer with exact values

Print the details of both books using print

💡 Why This Matters

🌍 Real World

Structs with memberwise initializers are used to model simple data objects like books, users, or products in apps.

💼 Career

Understanding memberwise initializers helps you quickly create and manage data models in Swift, a key skill for iOS development.

1

Create the Book struct

Create a struct called Book with three properties: title of type String, author of type String, and pages of type Int.

Swift

// Define the Book struct with title, author, and pages properties
// Your code here

Need a hint?

Use struct Book { } and inside it declare three var properties with the exact names and types.

2

Create the first book instance

Create a variable called firstBook and initialize it using the memberwise initializer of Book with these exact values: title = "The Swift Guide", author = "John Appleseed", pages = 250.

Swift

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

// Create firstBook using the memberwise initializer
// Your code here

Need a hint?

Use the syntax Book(title: "The Swift Guide", author: "John Appleseed", pages: 250) to create firstBook.

3

Create the second book instance

Create a variable called secondBook and initialize it using the memberwise initializer of Book with these exact values: title = "Learning SwiftUI", author = "Jane Developer", pages = 300.

Swift

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

var firstBook = Book(title: "The Swift Guide", author: "John Appleseed", pages: 250)

// Create secondBook using the memberwise initializer
// Your code here

Need a hint?

Use the memberwise initializer with the exact values to create secondBook.

4

Print the book details

Print the details of firstBook and secondBook using two separate print statements. Use string interpolation to show the title, author, and pages in this format: "Title: [title], Author: [author], Pages: [pages]".

Swift

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

var firstBook = Book(title: "The Swift Guide", author: "John Appleseed", pages: 250)
var secondBook = Book(title: "Learning SwiftUI", author: "Jane Developer", pages: 300)

// Print details of firstBook and secondBook
// Your code here

Need a hint?

Use print("Title: \(firstBook.title), Author: \(firstBook.author), Pages: \(firstBook.pages)") and similarly for secondBook.