sealed class in kotlin example
sealed class Message {
abstract val messageId: String
}
data class Track(val event: String, override val messageId: String): Message()
sealed class in kotlin example
sealed class Message {
abstract val messageId: String
}
data class Track(val event: String, override val messageId: String): Message()
sealed class in kotlin example
sealed interface Expr
sealed class MathExpr(): Expr
data class Const(val number: Double) : MathExpr()
data class Sum(val e1: Expr, val e2: Expr) : MathExpr()
object NotANumber : Expr
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