CODEWITHSUNDEEP
kotlin
Guy
Guy

Reputation: 67260

How to declare a Kotlin type of a fixed set of strings?

In Typescript I can declare a limited set of strings as a type:

declare type Status = 'GOOD' | 'MEDIUM' | 'POOR';

and I can then use this type to restrict the strings assigned to the status property:

interface Foo {
  status: Status;
}

How do I do that in Kotlin?

Upvotes: 4

Views: 1132

Answers (1)

s1m0nw1
s1m0nw1

Reputation: 81889

In Kotlin, you would create an enum for this

enum class Status {
    GOOD, MEDIUM, POOR
}

In this basic case, you can then use the enum constant's name as follows:

val state: Status = Status.MEDIUM
val stateString: String = state.name

If you want to have more sophisticated enums, you can give them custom properties:

enum class Status(val description: String) {
    GOOD("Good State"), MEDIUM("Medium State"), POOR("Poor State")
}

Upvotes: 7

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