step - 8

Throw.kt

interface Throw {
    val winsAgainst: List<Throw>
    fun beats(other: Throw) = winsAgainst.contains(other)

    object SCISSORS : Throw {
        override val winsAgainst = listOf(PAPER, LIZARD)
    }

    object PAPER : Throw {
        override val winsAgainst = listOf(ROCK, SPOCK)
    }

    object ROCK : Throw {
        override val winsAgainst = listOf(SCISSORS, LIZARD)
    }

    object LIZARD : Throw {
        override val winsAgainst = listOf(SPOCK, PAPER)
    }

    object SPOCK : Throw {
        override val winsAgainst = listOf(SCISSORS, ROCK)
    }
}