Set creation (setOf, mutableSetOf) in Kotlin - Mini Project: Build & Apply

Set creation (setOf, mutableSetOf)

📖 Scenario: You are organizing a small party and want to keep track of unique guests who have confirmed their attendance.

🎯 Goal: Build a Kotlin program that creates a set of guest names using setOf and a mutable set using mutableSetOf.

📋 What You'll Learn

Create an immutable set of guest names using setOf

Create a mutable set of guest names using mutableSetOf

Add a new guest to the mutable set

Print both sets to see the guests

💡 Why This Matters

🌍 Real World

Sets are useful to keep track of unique items like guest lists, product IDs, or tags without duplicates.

💼 Career

Understanding sets helps in data processing, filtering duplicates, and managing collections efficiently in software development.

1

Create an immutable set of guests

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

Kotlin

# Create an immutable set called guests with "Alice", "Bob", and "Charlie"
# Your code here

Need a hint?

Use val guests = setOf("Alice", "Bob", "Charlie") to create the set.

2

Create a mutable set of guests

Create a mutable set called mutableGuests using mutableSetOf with these exact names: "Alice", "Bob", "Charlie".

Kotlin

val guests = setOf("Alice", "Bob", "Charlie")
# Create a mutable set called mutableGuests with "Alice", "Bob", and "Charlie"
# Your code here

Need a hint?

Use val mutableGuests = mutableSetOf("Alice", "Bob", "Charlie") to create the mutable set.

3

Add a new guest to the mutable set

Add the guest "Diana" to the mutable set mutableGuests using the add method.

Kotlin

val guests = setOf("Alice", "Bob", "Charlie")
val mutableGuests = mutableSetOf("Alice", "Bob", "Charlie")
# Add "Diana" to mutableGuests
# Your code here

Need a hint?

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

4

Print both sets

Print the immutable set guests and the mutable set mutableGuests using two separate println statements.

Kotlin

val guests = setOf("Alice", "Bob", "Charlie")
val mutableGuests = mutableSetOf("Alice", "Bob", "Charlie")
mutableGuests.add("Diana")
# Print guests and mutableGuests
# Your code here

Need a hint?

Use println(guests) and println(mutableGuests) to display the sets.