Array creation and usage in Kotlin - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to create an array of integers with values 1, 2, and 3.

Kotlin

val numbers = arrayOf([1])

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

A1 2 3

B1, 2, 3

C[1, 2, 3]

D(1, 2, 3)

Attempts:

3 left

💡 Hint

Common Mistakes

Forgetting commas between values.

Using square brackets instead of parentheses.

The arrayOf function takes comma-separated values to create an array. So arrayOf(1, 2, 3) creates an array with elements 1, 2, and 3.

2fill in blank

medium

Complete the code to access the second element of the array named fruits.

Kotlin

val secondFruit = fruits[[1]]

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

A0

B-1

C2

D1

Attempts:

3 left

💡 Hint

Common Mistakes

Using 2 instead of 1 for the second element index.

Using negative indices which are not valid in Kotlin arrays.

Arrays in Kotlin are zero-indexed, so the first element is at index 0 and the second element is at index 1.

3fill in blank

hard

Fix the error in the code to create an array of size 5 filled with zeros.

Kotlin

val zeros = Array([1] = 5) { 0 }

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

Acount

Blength

Csize

Dcapacity

Attempts:

3 left

💡 Hint

Common Mistakes

Using length or count which are not parameter names here.

Using capacity which is not valid for Kotlin arrays.

The Array constructor in Kotlin takes the size as the first argument. The correct parameter name is size.

4fill in blank

hard

Fill both blanks to create an array of strings with values "apple", "banana", and "cherry".

Kotlin

val fruits = arrayOf([1]) // Create array
val firstFruit = fruits[[2]] // Access first element

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

A"apple", "banana", "cherry"

B0

C1

D"apple"

Attempts:

3 left

💡 Hint

Common Mistakes

Using index 1 to access the first element.

Not using quotes around string values.

The arrayOf function takes comma-separated string values to create the array. The first element is at index 0.

5fill in blank

hard

Fill all three blanks to create an array of integers from 1 to 5, square each number, and filter out squares greater than 10.

Kotlin

val numbers = arrayOf(1, 2, 3, 4, 5)
val squares = numbers.map { it [1] [2] }
val filtered = squares.filter { it [3] 10 }

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

A*

Bit

C<=

D>

Attempts:

3 left

💡 Hint

Common Mistakes

Using addition instead of multiplication for squaring.

Using wrong comparison operators in filter.

To square a number, multiply it by itself: it * it. To keep squares less than or equal to 10, use it <= 10.