Var for mutable references in Kotlin - Mini Project: Build & Apply

Using <code>var</code> for Mutable References in Kotlin

📖 Scenario: Imagine you are managing a simple inventory system for a small store. You want to keep track of the number of items available and update this number as items are sold or restocked.

🎯 Goal: You will create a mutable variable using var in Kotlin to hold the inventory count. Then, you will update this count to reflect sales and restocking.

📋 What You'll Learn

Create a mutable variable called inventoryCount with an initial value of 50.

Create a variable called soldItems with the value 5.

Update inventoryCount by subtracting soldItems.

Print the updated inventoryCount.

Create a variable called restockedItems with the value 10.

Update inventoryCount by adding restockedItems.

Print the final inventoryCount.

💡 Why This Matters

🌍 Real World

Managing inventory counts is a common task in stores, warehouses, and online shops. Using mutable variables helps keep track of changing stock levels.

💼 Career

Understanding mutable variables is essential for any Kotlin developer working on apps that handle data changes, such as inventory systems, games, or user settings.

1

Create a mutable variable for inventory count

Create a mutable variable called inventoryCount and set it to 50.

Kotlin

# Your code here

Need a hint?

Use var to create a variable that can change later.

2

Create a variable for sold items

Create a variable called soldItems and set it to 5.

Kotlin

var inventoryCount = 50
# Your code here

Need a hint?

Use val for values that do not change.

3

Update inventory after sales

Update inventoryCount by subtracting soldItems using inventoryCount = inventoryCount - soldItems.

Kotlin

var inventoryCount = 50
val soldItems = 5
# Your code here

Need a hint?

Assign the new value back to inventoryCount after subtracting.

4

Print updated inventory and restock

Print the current inventoryCount. Then create a variable called restockedItems with value 10, update inventoryCount by adding restockedItems, and print the final inventoryCount.

Kotlin

var inventoryCount = 50
val soldItems = 5
inventoryCount = inventoryCount - soldItems
# Your code here

Need a hint?

Use println() to show the values. Remember to update inventoryCount after restocking.