Sorted and sortedBy in Kotlin - Mini Project: Build & Apply

Sorting a List of Fruits by Name and Length

📖 Scenario: You work in a fruit store and want to organize your list of fruits. Sometimes you want to see them in alphabetical order, and other times by how long their names are.

🎯 Goal: Learn how to use sorted() to sort a list alphabetically and sortedBy() to sort by a specific property, like the length of the fruit names.

📋 What You'll Learn

Create a list of fruits with exact names

Create a variable to hold the sorted list alphabetically

Create a variable to hold the list sorted by length of fruit names

Print both sorted lists exactly as specified

💡 Why This Matters

🌍 Real World

Sorting lists is common in apps like shopping lists, contact lists, or any place where you want to organize items for easier viewing.

💼 Career

Understanding sorting helps in data processing, UI display, and backend logic in many software development roles.

1

Create the list of fruits

Create a list called fruits with these exact string values in this order: "Banana", "Apple", "Cherry", "Date", "Elderberry"

Kotlin

// Create the list of fruits
// Your code here

Need a hint?

Use listOf() to create a list with the exact fruit names.

2

Create a variable for alphabetical sorting

Create a variable called sortedFruits that holds the list fruits sorted alphabetically using sorted()

Kotlin

val fruits = listOf("Banana", "Apple", "Cherry", "Date", "Elderberry")
// Create sortedFruits using sorted() to sort fruits alphabetically
// Your code here

Need a hint?

Use sorted() on the fruits list to get an alphabetically sorted list.

3

Create a variable for sorting by length

Create a variable called sortedByLength that holds the list fruits sorted by the length of each fruit name using sortedBy and the lambda { it.length }

Kotlin

val fruits = listOf("Banana", "Apple", "Cherry", "Date", "Elderberry")
val sortedFruits = fruits.sorted()
// Create sortedByLength using sortedBy with it.length
// Your code here

Need a hint?

Use sortedBy { it.length } to sort the list by the length of each fruit name.

4

Print both sorted lists

Print the variable sortedFruits on one line and then print sortedByLength on the next line exactly as lists (use println)

Kotlin

val fruits = listOf("Banana", "Apple", "Cherry", "Date", "Elderberry")
val sortedFruits = fruits.sorted()
val sortedByLength = fruits.sortedBy { it.length }
// Print sortedFruits and sortedByLength
// Your code here

Need a hint?

Use println() to print each sorted list on its own line.