Functions returning tuples in Swift - Mini Project: Build & Apply

Functions Returning Tuples in Swift

📖 Scenario: You are building a simple app that processes information about a book. You want to create a function that returns multiple pieces of information about the book at once.

🎯 Goal: Build a Swift function that returns a tuple containing the title and the number of pages of a book. Then, use this function to get the book details and print them.

📋 What You'll Learn

Create a function named getBookInfo that returns a tuple with two values: a String called title and an Int called pages.

Call the getBookInfo function and store its result in a variable named bookDetails.

Extract the title and pages from the tuple stored in bookDetails.

Print the book title and number of pages using the extracted values.

💡 Why This Matters

🌍 Real World

Functions returning tuples are useful when you want to return multiple related pieces of information from a function without creating a custom data type.

💼 Career

Understanding tuples helps in writing clean and efficient Swift code, which is important for iOS app development and other Swift-based projects.

1

Create the function getBookInfo

Write a function named getBookInfo that returns a tuple with title as a String set to "The Swift Guide" and pages as an Int set to 250.

Swift

// Write the function getBookInfo that returns a tuple with title and pages
// Your code here

Need a hint?

Use the syntax func functionName() -> (name: Type, name2: Type) to return a tuple.

2

Call getBookInfo and store the result

Call the function getBookInfo() and store its returned tuple in a variable named bookDetails.

Swift

func getBookInfo() -> (title: String, pages: Int) {
    return (title: "The Swift Guide", pages: 250)
}

// Call getBookInfo and store the result in bookDetails
// Your code here

Need a hint?

Use let bookDetails = getBookInfo() to call the function and save the tuple.

3

Extract title and pages from the tuple

Extract the title and pages values from the bookDetails tuple into two separate constants named title and pages.

Swift

func getBookInfo() -> (title: String, pages: Int) {
    return (title: "The Swift Guide", pages: 250)
}

let bookDetails = getBookInfo()

// Extract title and pages from bookDetails
// Your code here

Need a hint?

Use dot notation like bookDetails.title to get values from the tuple.

4

Print the book title and pages

Print the book title and number of pages using print with the format: "Title: The Swift Guide, Pages: 250" using the title and pages constants.

Swift

func getBookInfo() -> (title: String, pages: Int) {
    return (title: "The Swift Guide", pages: 250)
}

let bookDetails = getBookInfo()

let title = bookDetails.title
let pages = bookDetails.pages

// Print the book title and pages
// Your code here

Need a hint?

Use print("Title: \(title), Pages: \(pages)") to show the values.