Array creation and usage in Kotlin - Mini Project: Build & Apply

Array creation and usage

📖 Scenario: You are helping a small shop owner keep track of the prices of some fruits they sell. You will create an array to store the prices, then work with it to find useful information.

🎯 Goal: Build a Kotlin program that creates an array of fruit prices, sets a price threshold, finds which fruits are more expensive than that threshold, and prints those prices.

📋 What You'll Learn

Create an array with exact fruit prices

Create a price threshold variable

Use a loop or array function to find prices above the threshold

Print the filtered prices

💡 Why This Matters

🌍 Real World

Arrays are used to store lists of related data, like prices of items in a shop. Filtering arrays helps find items that meet certain conditions, such as expensive products.

💼 Career

Understanding arrays and how to filter them is essential for many programming jobs, including data analysis, app development, and backend services.

1

Create an array of fruit prices

Create an array called fruitPrices with these exact values: 50, 30, 70, 90, 20.

Kotlin

# Create an array called fruitPrices with the given prices
// Your code here

Need a hint?

Use arrayOf() to create an array with the given numbers.

2

Set a price threshold

Create an integer variable called priceThreshold and set it to 60.

Kotlin

val fruitPrices = arrayOf(50, 30, 70, 90, 20)
// Create an integer variable priceThreshold and set it to 60
// Your code here

Need a hint?

Use val priceThreshold = 60 to create the variable.

3

Find prices above the threshold

Create a new array called expensiveFruits that contains only the prices from fruitPrices which are greater than priceThreshold. Use the filter function.

Kotlin

val fruitPrices = arrayOf(50, 30, 70, 90, 20)
val priceThreshold = 60
// Create expensiveFruits array by filtering fruitPrices for prices > priceThreshold
// Your code here

Need a hint?

Use fruitPrices.filter { price -> price > priceThreshold } and convert the result to an array with toTypedArray().

4

Print the expensive fruit prices

Print the expensiveFruits array using println. Use joinToString() to display the prices separated by commas.

Kotlin

val fruitPrices = arrayOf(50, 30, 70, 90, 20)
val priceThreshold = 60
val expensiveFruits = fruitPrices.filter { price -> price > priceThreshold }.toTypedArray()
// Print expensiveFruits prices separated by commas
// Your code here

Need a hint?

Use println(expensiveFruits.joinToString(", ")) to print the prices separated by commas.