Enums in Kotlin

1. What is an Enum in Kotlin?

An enum class in Kotlin is a special type that represents a set of constant values.

2. How do you declare an Enum in Kotlin?

3. Can enums have properties and methods?

Yes, enums can have properties and methods.

4. How are enum constants accessed in Kotlin?

Enum constants are accessed using their names.

5. Can enums have custom properties for each constant?

Yes, enums can have custom properties for each constant, as shown in the previous example.

6. What is the purpose of the values() function in enums?

The values() function returns an array of enum constants, allowing you to iterate over them.

7. How can you use enums in when expressions?

Enums are often used in when expressions for exhaustive checks.

8. Can enums implement interfaces in Kotlin?

Yes, enums can implement interfaces.

9. What is the use of the valueOf() function in enums?

The valueOf() function is used to obtain an enum constant by its name.

10. How do you define custom methods for individual enum constants?

Custom methods are defined inside the enum class, as shown in a previous example.

11. Can enums have constructor parameters?

Yes, enums can have constructor parameters for each constant.

12. How do you get the ordinal value of an enum constant?

The ordinal value represents the position of an enum constant in the declaration order.

13. What is the purpose of the name property in enums?

The name property returns the name of the enum constant as a string.

14. How can you use enums in a when expression with multiple conditions?

Enums can be used in a when expression with multiple conditions.

15. What is the significance of the compareTo() function in enums?

The compareTo() function is used to compare the ordinal values of two enum constants.

16. How can you iterate over the constants of an enum using a loop?

Enums can be iterated using a loop or using the values() function.

17. How do you use enums for singleton pattern in Kotlin?

Enums can be used for implementing a singleton pattern in Kotlin.

18. What is the difference between an enum class and a regular class with constants?

Enum classes provide a more structured way to represent a fixed set of constants, and they can have behavior.

19. How can you use enum classes in a sealed class hierarchy?

20. How can you compare enum values in Kotlin?