How to define a non-ordinal enum in Kotlin?

Question

I want to define an enum that values are not ordinal, for example:

enum class States(value: Int) {     STATE_A(4),     STATE_B(5),     STATE_C(7),     STATE_D(12) } 

How can I get the value of each item? For instance States.STATE_C should return 7.

Answer 1

You should define value as property (val) not as constructor parameter. After that it becomes accessible:

enum class States(val value: Int) {     STATE_A(1),     STATE_B(2),     STATE_C(3),     STATE_D(4) } ... println(States.STATE_C.value) // prints 3 

Also consider to use ordinal, which may be suitable in your case:

enum class States {     STATE_A,     STATE_B,     STATE_C,     STATE_D } ... println(States.STATE_C.ordinal + 1) // prints 3 

If you go with that approach, be careful - any change of States order can break your code.