[SOLVED] Initialize enum from associated value

Initialize enum from associated value

I would like to initialize enum by its associated value.

My enum:

enum class DirectionSwiped(raw: Int){
    LEFT(4),
    RIGHT(8);
}

I would like to initialize it as such:

val direction = DirectionSwiped(raw: 4)

But I get this error:

Enum type cannot be instantiated

Why is this happening? In Swift, this functionality works like this:

enum Direction: Int {
    case right = 2
}

let direction = Direction(rawValue: 2)

How can I make it work in Kotlin?

Solution

Yes you can

enum class DirectionSwiped(val raw: Int){
    LEFT(4),
    RIGHT(8);
}

val left = DirectionSwiped.LEFT
val right = DirectionSwiped.RIGHT

val leftRaw = DirectionSwiped.LEFT.raw
val rightRaw = DirectionSwiped.LEFT.raw

val fromRaw = DirectionSwiped.values().firstOrNull { it.raw == 5 }

This would be the correct way to access the instances of the enum class

What you are trying to do is create a new instance outside the definition site, which is not possible for enum or sealed classes, that's why the error says the constructor is private