Kotlin Collections and Operators

Kotlin Collections, functional operators (map, filter, reduce), Sequences, higher-order functions, operator overloading

20 면접 질문·

Mid-Level

What is the difference between List and MutableList in Kotlin?

답변

List is a read-only interface that doesn't allow modifying the collection after creation. MutableList extends List and adds modification methods like add(), remove(), clear(). List guarantees structural immutability.

How do you create an immutable list in Kotlin?

답변

Use listOf() to create an immutable list. This function returns a read-only List<T>. For a mutable list, use mutableListOf() or arrayListOf().

What is the map() operator used for on a collection?

답변

map() transforms each element of the collection by applying a function, and returns a new list with the transformed elements. For example: listOf(1,2,3).map { it * 2 } returns [2,4,6].

Kotlin Collections and Operators

What is the difference between List and MutableList in Kotlin?

답변

How do you create an immutable list in Kotlin?

답변

What is the map() operator used for on a collection?

답변

What is the filter() operator used for?

What is the difference between map() and flatMap()?

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