Break and continue behavior in Kotlin - Mini Project: Build & Apply

Break and continue behavior

📖 Scenario: You are organizing a small event and have a list of guests with their ages. You want to process this list to find guests who are adults and stop checking once you find a guest who is exactly 21 years old. You also want to skip any guests who are under 18.

🎯 Goal: Build a Kotlin program that uses break and continue statements inside a for loop to process a list of guest ages. The program should skip guests under 18, stop processing when a guest aged 21 is found, and print the ages of guests processed.

📋 What You'll Learn

Create a list of guest ages called guestAges with the exact values: 16, 17, 18, 19, 20, 21, 22

Create a variable called processedAges as an empty mutable list of integers

Use a for loop with variable age to iterate over guestAges

Inside the loop, use continue to skip ages less than 18

Inside the loop, use break to stop the loop when age equals 21

Add each processed age to processedAges

Print the processedAges list at the end

💡 Why This Matters

🌍 Real World

This project shows how to control loops when processing lists, which is common when filtering or searching data like guest lists, orders, or sensor readings.

💼 Career

Understanding break and continue helps in writing efficient code that can skip unnecessary work or stop early, important skills for software developers and data analysts.

1

Create the guest ages list

Create a list called guestAges with these exact integer values: 16, 17, 18, 19, 20, 21, 22.

Kotlin

# Create the guestAges list with the exact values
# Your code here

Need a hint?

Use listOf to create a list with the exact ages.

2

Create the processed ages list

Create a mutable list of integers called processedAges and initialize it as empty.

Kotlin

val guestAges = listOf(16, 17, 18, 19, 20, 21, 22)
# Create an empty mutable list called processedAges
# Your code here

Need a hint?

Use mutableListOf<Int>() to create an empty mutable list of integers.

3

Process the guest ages with break and continue

Use a for loop with variable age to iterate over guestAges. Inside the loop, use continue to skip ages less than 18. Use break to stop the loop when age equals 21. Add each processed age to processedAges.

Kotlin

val guestAges = listOf(16, 17, 18, 19, 20, 21, 22)
val processedAges = mutableListOf()
# Add a for loop to iterate over guestAges
# Use continue to skip ages less than 18
# Use break to stop when age is 21
# Add each processed age to processedAges
# Your code here

Need a hint?

Use for (age in guestAges) to loop. Use continue and break as needed.

4

Print the processed ages list

Write a println statement to print the processedAges list.

Kotlin

val guestAges = listOf(16, 17, 18, 19, 20, 21, 22)
val processedAges = mutableListOf()
for (age in guestAges) {
    if (age < 18) continue
    if (age == 21) break
    processedAges.add(age)
}
# Print the processedAges list
# Your code here

Need a hint?

Use println(processedAges) to display the list.