Labeled break and continue in Kotlin - Mini Project: Build & Apply

Using Labeled break and continue in Kotlin

📖 Scenario: Imagine you are organizing a small sports event. You have a list of teams and their players. You want to find the first team that has a player named "Alex" and stop searching once you find it. Also, you want to skip any team that has no players.

🎯 Goal: You will write a Kotlin program that uses labeled break and continue statements to efficiently search through teams and players.

📋 What You'll Learn

Create a map called teams with exactly these entries: "Tigers" with players ["John", "Alex", "Sam"], "Lions" with players [], and "Bears" with players ["Mike", "Anna"].

Create a Boolean variable called foundAlex and set it to false.

Use a labeled for loop named teamLoop to iterate over teams. Inside, skip teams with no players using a labeled continue. If a player named "Alex" is found, set foundAlex to true and use a labeled break to exit the outer loop.

Print "Found Alex in team: <teamName>" if foundAlex is true, otherwise print "Alex not found in any team".

💡 Why This Matters

🌍 Real World

Using labeled break and continue helps when searching through complex data like teams and players, allowing you to stop or skip parts efficiently.

💼 Career

Understanding labeled loops is useful in software development when working with nested data structures or complex loops, improving code clarity and performance.

1

Create the teams map

Create a map called teams with these exact entries: "Tigers" with players ["John", "Alex", "Sam"], "Lions" with players [], and "Bears" with players ["Mike", "Anna"].

Kotlin

# Create the teams map with the exact entries
# Your code here

Need a hint?

Use mapOf to create the map. Each team name maps to a list of player names.

2

Create the foundAlex variable

Create a Boolean variable called foundAlex and set it to false.

Kotlin

val teams = mapOf(
    "Tigers" to listOf("John", "Alex", "Sam"),
    "Lions" to listOf(),
    "Bears" to listOf("Mike", "Anna")
)

# Create foundAlex variable and set it to false
# Your code here

Need a hint?

Use var to create a variable that can change later.

3

Use labeled loops with break and continue

Use a labeled for loop named teamLoop to iterate over teams. Inside, skip teams with no players using a labeled continue. If a player named "Alex" is found, set foundAlex to true and use a labeled break to exit the outer loop.

Kotlin

val teams = mapOf(
    "Tigers" to listOf("John", "Alex", "Sam"),
    "Lions" to listOf(),
    "Bears" to listOf("Mike", "Anna")
)

var foundAlex = false

# Use labeled loops to find "Alex" and skip empty teams
# Your code here

Need a hint?

Label the outer loop with teamLoop@. Use continue@teamLoop to skip empty teams. Use break@teamLoop to stop searching when "Alex" is found.

4

Print the result

Print "Found Alex in team: <teamName>" if foundAlex is true, otherwise print "Alex not found in any team". Use the variable teamName from the loop where foundAlex was set.

Kotlin

val teams = mapOf(
    "Tigers" to listOf("John", "Alex", "Sam"),
    "Lions" to listOf(),
    "Bears" to listOf("Mike", "Anna")
)

var foundAlex = false

teamLoop@ for ((teamName, players) in teams) {
    if (players.isEmpty()) continue@teamLoop
    for (player in players) {
        if (player == "Alex") {
            foundAlex = true
            break@teamLoop
        }
    }
}

# Print the result based on foundAlex
# Your code here

Need a hint?

Remember to store the team name when you find Alex, so you can print it after the loops.