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

Source: tedblob.com

Sealed class in kotlin example

sealed class Message {
    abstract val messageId: String
}
data class Track(val event: String, override val messageId: String): Message()

Source: tedblob.com

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