Map creation (mapOf, mutableMapOf) in Kotlin - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to create an immutable map with two entries.

Kotlin

val colors = [1]("red" to "#FF0000", "green" to "#00FF00")

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

AmutableMapOf

BmapOf

ClistOf

DsetOf

Attempts:

3 left

💡 Hint

Common Mistakes

Using mutableMapOf creates a mutable map, not immutable.

Using listOf or setOf creates collections, not maps.

Use mapOf to create an immutable map in Kotlin.

2fill in blank

medium

Complete the code to create a mutable map and add a new entry.

Kotlin

val fruits = [1]("apple" to 1, "banana" to 2)
fruits["orange"] = 3

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AmutableMapOf

BmapOf

ClistOf

DsetOf

Attempts:

3 left

💡 Hint

Common Mistakes

Using mapOf creates an immutable map, so adding entries causes an error.

mutableMapOf creates a map that can be changed after creation.

3fill in blank

hard

Fix the error in the code by choosing the correct function to create a mutable map.

Kotlin

val scores = [1]("Alice" to 10, "Bob" to 8)
scores["Charlie"] = 7

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AmapOf

BsetOf

CmutableMapOf

DlistOf

Attempts:

3 left

💡 Hint

Common Mistakes

Using mapOf causes an error when adding new entries.

Only mutableMapOf allows adding new entries after creation.

4fill in blank

hard

Fill both blanks to create a map of squares for numbers greater than 3.

Kotlin

val squares = (1..5).filter { it [2] 3 }.associate { it to it [1] it }

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A**

B>

C<

D*

Attempts:

3 left

💡 Hint

Common Mistakes

Using ** for power in Kotlin is incorrect.

Using < instead of > filters the wrong numbers.

Use * for multiplication and > to filter numbers greater than 3.

5fill in blank

hard

Fill all three blanks to create a mutable map with uppercase keys and values greater than 0.

Kotlin

val result = data.entries.filter { (_, v) -> v [3] 0 }.associate { (k, v) -> [1] to [2] }.toMutableMap()

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Ak.uppercase()

Bv

C>

Dk

Attempts:

3 left

💡 Hint

Common Mistakes

Using < instead of > filters wrong entries.

Not transforming keys to uppercase.

Use k.uppercase() for uppercase keys, keep values as v, and filter values greater than 0 with >.