Kotlin Kotlin Collections

Question 1

Which function creates an immutable list in Kotlin?

Accepted Answer

listOf()

Answer

`listOf()` creates a read-only list in Kotlin that cannot be modified after creation.

Question 2

What does the `map` function do on a Kotlin collection?

Accepted Answer

Transforms each element using a given function and returns a new list

Answer

`map` applies a transformation function to each element of a collection and returns a new list with the transformed values.

Question 3

Which Kotlin collection function returns elements that satisfy a given predicate?

Accepted Answer

filter

Answer

`filter` returns a new list containing only elements for which the predicate function returns true.

Question 4

What is the difference between `List` and `MutableList` in Kotlin?

Accepted Answer

List is read-only; MutableList supports add/remove operations

Answer

`List` is a read-only interface in Kotlin, while `MutableList` extends it with mutation operations like `add()` and `remove()`.

Question 5

Which function combines all elements of a collection into a single result?

Accepted Answer

fold

Answer

`fold` accumulates a value starting from an initial seed, applying an operation to each element and the accumulated value.

Kotlin Practice Test