For loop over collections in Kotlin - Mini Project: Build & Apply

For loop over collections

📖 Scenario: You work at a small bookstore. You have a list of book titles that you want to display one by one to your customers.

🎯 Goal: Learn how to use a for loop in Kotlin to go through each item in a list and print it.

📋 What You'll Learn

Create a list of book titles with exact values

Create a variable to count the number of books

Use a for loop with variable book to iterate over the list

Print each book title inside the loop

Print the total number of books after the loop

💡 Why This Matters

🌍 Real World

Bookstores and libraries often need to show lists of books to customers or users. Looping through collections helps display or process each item easily.

💼 Career

Knowing how to loop over collections is a basic skill for any programmer. It helps in tasks like processing data, generating reports, or building user interfaces.

1

Create a list of book titles

Create a list called books with these exact titles: "The Hobbit", "1984", "Pride and Prejudice", "To Kill a Mockingbird".

Kotlin

// Create the list of books here
// Your code here

Need a hint?

Use val books = listOf(...) to create the list with the exact book titles.

2

Create a counter variable

Create a variable called count and set it to 0 to count the number of books.

Kotlin

val books = listOf("The Hobbit", "1984", "Pride and Prejudice", "To Kill a Mockingbird")
// Create the count variable here
// Your code here

Need a hint?

Use var count = 0 to create a variable that can change.

3

Use a for loop to print each book

Use a for loop with variable book to go through each item in books. Inside the loop, print the book and increase count by 1.

Kotlin

val books = listOf("The Hobbit", "1984", "Pride and Prejudice", "To Kill a Mockingbird")
var count = 0
// Write a for loop to print each book and increase count
// Your code here

Need a hint?

Use for (book in books) { ... } to loop. Use println(book) to print each title. Use count++ to add one to count.

4

Print the total number of books

After the loop, print the text Total books: followed by the value of count using a Kotlin println statement with string interpolation.

Kotlin

val books = listOf("The Hobbit", "1984", "Pride and Prejudice", "To Kill a Mockingbird")
var count = 0
for (book in books) {
    println(book)
    count++
}
// Print the total number of books here
// Your code here

Need a hint?

Use println("Total books: $count") to show the total count after the loop.