List creation (listOf, mutableListOf) in Kotlin - Mini Project: Build & Apply

List creation (listOf, mutableListOf)

📖 Scenario: You are organizing a small party and need to keep track of the guests who will attend.

🎯 Goal: Create a list of guests using listOf and then create a mutable list using mutableListOf to add more guests later.

📋 What You'll Learn

Create an immutable list called guests with exactly these names: "Alice", "Bob", "Charlie"

Create a mutable list called moreGuests starting with the same names as guests

Add the name "Diana" to the moreGuests list

Print the moreGuests list to show all guests

💡 Why This Matters

🌍 Real World

Lists are used everywhere to keep track of groups of items, like guests at a party, tasks to do, or products in a store.

💼 Career

Knowing how to create and modify lists is a basic skill for any programmer, useful in almost all software development jobs.

1

Create an immutable list of guests

Create an immutable list called guests using listOf with these exact names: "Alice", "Bob", "Charlie".

Kotlin

# Create the immutable list guests with the names Alice, Bob, and Charlie
# Your code here

Need a hint?

Use val guests = listOf("Alice", "Bob", "Charlie") to create the list.

2

Create a mutable list from the immutable list

Create a mutable list called moreGuests using mutableListOf and initialize it with the contents of the guests list.

Kotlin

val guests = listOf("Alice", "Bob", "Charlie")
# Create a mutable list moreGuests initialized with guests
# Your code here

Need a hint?

Use mutableListOf().apply { addAll(guests) } to copy the guests list.

3

Add a new guest to the mutable list

Add the name "Diana" to the moreGuests mutable list using the add method.

Kotlin

val guests = listOf("Alice", "Bob", "Charlie")
val moreGuests = mutableListOf().apply { addAll(guests) }
# Add "Diana" to moreGuests
# Your code here

Need a hint?

Use moreGuests.add("Diana") to add the new guest.

4

Print the final list of guests

Print the moreGuests list to show all the guests including the newly added one.

Kotlin

val guests = listOf("Alice", "Bob", "Charlie")
val moreGuests = mutableListOf().apply { addAll(guests) }
moreGuests.add("Diana")
# Print the moreGuests list
# Your code here

Need a hint?

Use println(moreGuests) to print the list.