Local functions (nested functions) in Kotlin - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to define a local function inside main.

Kotlin

fun main() {
    fun [1]() {
        println("Hello from local function")
    }
    greet()
}

Drag options to blanks, or click blank then click option'

Agreet

Bhello

CsayHello

DlocalFunc

Attempts:

3 left

💡 Hint

Common Mistakes

Using a different function name than the one called.

Defining the function outside main.

The local function is called greet and is called inside main.

2fill in blank

medium

Complete the code to call the local function inside main.

Kotlin

fun main() {
    fun greet() {
        println("Hi there!")
    }
    [1]()
}

Drag options to blanks, or click blank then click option'

Agreet

Bhello

CsayHello

DlocalFunc

Attempts:

3 left

💡 Hint

Common Mistakes

Calling a function name that is not defined.

Forgetting the parentheses to call the function.

The local function greet is called inside main to print the message.

3fill in blank

hard

Fix the error by completing the code to return the sum using a local function.

Kotlin

fun sumNumbers(a: Int, b: Int): Int {
    fun add() = a [1] b
    return add()
}

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A/

B-

C*

D+

Attempts:

3 left

💡 Hint

Common Mistakes

Using subtraction or multiplication instead of addition.

Forgetting to return the result of the local function.

The local function add returns the sum of a and b using the + operator.

4fill in blank

hard

Fill both blanks to create a local function that checks if a number is even.

Kotlin

fun main() {
    fun [1](num: Int): Boolean {
        return num [2] 2 == 0
    }
    println(isEven(4))
}

Drag options to blanks, or click blank then click option'

AisEven

B%

C/

D==

Attempts:

3 left

💡 Hint

Common Mistakes

Using division / instead of modulus %.

Naming the function something unrelated.

The local function isEven checks if the number divided by 2 leaves a remainder of 0 using the modulus operator %.

5fill in blank

hard

Fill all three blanks to create a local function that filters and returns words longer than 3 letters.

Kotlin

fun main() {
    val words = listOf("cat", "house", "dog", "elephant")
    fun filterLongWords(list: List<String>): List<String> {
        return list.filter { word -> word.[1] > [2] }
    }
    val result = filterLongWords(words)
    println(result) // Should print words longer than [3] letters
}

Drag options to blanks, or click blank then click option'

Alength

B3

Dsize

Attempts:

3 left

💡 Hint

Common Mistakes

Using word.size which is not valid for strings.

Using the wrong number for comparison.

Confusing length with size.

The local function uses word.length to get the length of each word and filters those longer than 3 letters.