Kotlin Collections and Operators
Kotlin Collections, functional operators (map, filter, reduce), Sequences, higher-order functions, operator overloading
1What is the difference between List and MutableList in Kotlin?
What is the difference between List and MutableList in Kotlin?
Câu trả lời
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.
2How do you create an immutable list in Kotlin?
How do you create an immutable list in Kotlin?
Câu trả lời
Use listOf() to create an immutable list. This function returns a read-only List<T>. For a mutable list, use mutableListOf() or arrayListOf().
3What is the map() operator used for on a collection?
What is the map() operator used for on a collection?
Câu trả lời
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].
What is the filter() operator used for?
What is the difference between map() and flatMap()?
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