I want to get a list<String> of this enum cl...

# getting-started

[Colton Idle]

I want to get a list<String> of this enum class.

enum class BackendEnv(val humanReadableName: String) {
  STAGING("Staging"),
  PROD("Production")
}

How would you do it?

[Colton Idle]

I tried this code

inline fun <reified BackendEnv : Enum<BackendEnv>> listOfBackendEnv(): List<String> {
  return enumValues<BackendEnv>().map { it.humanReadableName }
}

but it didn't work. The above code was inspired by this

https://kotlinlang.org/docs/enum-classes.html#working-with-enum-constants

[Tim Oltjenbruns]

BackendEnv.values().map { it.humanReadableName }

[Tim Oltjenbruns]

enumValues<> is for generic access

[Colton Idle]

Thanks for teaching!

[ephemient]

inline fun <reified T : Enum<T>> enumNames() = enumValues<T>.map { it.name }

is where the generic version would be useful, but for your use case, it looks like you want that specific type, not a generic

[ephemient]

or

interface HasHumanReadableName {
    val humanReadableName: String
}
enum class BackendEnv(override val humanReadableName: String) : HasHumanReadableName {
    STAGING("Staging"),
    PROD("Production")
}
inline fun <reified T> listOfHumanReadableNames(): List<String>
    where T : Enum<T>, T : HasHumanReadableName =
    enumValues<T>().map { it.humanReadableName }

println(listOfHumanReadableNames<BackendEnv>())

for example