Collections in Kotlin

1. What are collections in Kotlin?

Collections in Kotlin are containers that hold multiple elements, allowing for operations like iteration, modification, and retrieval.

2. Differentiate between List, Set, and Map in Kotlin.

• List: Ordered collection of elements with duplicates allowed.

• Set: Unordered collection of unique elements.

• Map: Collection of key-value pairs, where each key is associated with exactly one value.

3. How do you create an immutable list in Kotlin?

4. Explain the difference between mutableListOf and listOf in Kotlin.

mutableListOf creates a mutable list, allowing modifications, while listOf creates an immutable list.

5. What is the purpose of the to infix function in Kotlin?

The to function is used to create pairs for use in maps.

6. How do you iterate through a list in Kotlin?

7. Explain the use of filter and map functions on a list in Kotlin.

8. What is the difference between mutableSetOf and setOf in Kotlin?

mutableSetOf creates a mutable set, allowing modifications, while setOf creates an immutable set.

9. How do you check if an element exists in a set in Kotlin?

10. Explain the use of distinct and toSet functions on a list in Kotlin.

11. How do you create a mutable map in Kotlin?

12. Explain the use of the get and getOrElse functions on a map in Kotlin.

13. How do you iterate through a map in Kotlin?

14. What is the purpose of the all, any, and none functions on collections in Kotlin?

15. How do you perform grouping operations on a list in Kotlin?

16. What is the purpose of the partition function on collections in Kotlin?

17. Explain the use of zip and unzip functions on collections in Kotlin.

18. How do you perform element-wise operations on lists in Kotlin?

19. Explain the purpose of the flatMap function on collections in Kotlin.

20. What is the difference between toList and toMutableList functions in Kotlin?

toList creates an immutable list, while toMutableList creates a mutable list.