Let for constants (immutable) in Swift - Mini Project: Build & Apply

Let for constants (immutable)

📖 Scenario: Imagine you are creating a simple app that stores some fixed information about a book. This information should never change once set, like the book's title and the number of pages.

🎯 Goal: You will create constants using let in Swift to store fixed information about a book. Then, you will print these constants to see their values.

📋 What You'll Learn

Create a constant called bookTitle with the value "The Swift Guide"

Create a constant called pageCount with the value 350

Print the values of bookTitle and pageCount using print

💡 Why This Matters

🌍 Real World

Constants are used to store fixed information like configuration settings, labels, or fixed data that should not change during the program.

💼 Career

Understanding constants is essential for writing safe and predictable code in Swift, which is important for app development jobs.

1

Create constants for book information

Create a constant called bookTitle and set it to the string "The Swift Guide".

Swift

# Create a constant called bookTitle and set it to "The Swift Guide"
# Your code here

Need a hint?

Use let to create a constant. For example: let name = "value"

2

Add a constant for the number of pages

Create a constant called pageCount and set it to the number 350.

Swift

let bookTitle = "The Swift Guide"
# Create a constant called pageCount and set it to 350
# Your code here

Need a hint?

Remember to use let for constants and assign the number directly.

3

Print the book title

Write a print statement to display the value of the constant bookTitle.

Swift

let bookTitle = "The Swift Guide"
let pageCount = 350
# Print the value of bookTitle
# Your code here

Need a hint?

Use print(bookTitle) to show the book title.

4

Print the page count

Write a print statement to display the value of the constant pageCount.

Swift

let bookTitle = "The Swift Guide"
let pageCount = 350
print(bookTitle)
# Print the value of pageCount
# Your code here

Need a hint?

Use print(pageCount) to show the number of pages.