SimpleExample.kt

fun main() {

    val lines = Try {
        File("./my-pets.csv").readLines().map { it.split(',') }
    }

    val pets : Try<List<Pet>> = lines.map { it.map(::toPet) }

    when (pets) {
        is Success -> println(pets.value)
        is Failure -> println(pets.error)
    }
}

fun toPet(values: List<String>): Pet {
    val name = values[0]
    val age = values[1].toInt()
    val type = PetType.lookup(values[2])

    return Pet(name, age, type)
}

data class Pet(
    val name: String,
    val age: Int,
    val type: PetType
)

enum class PetType(val type: String) {

    Cat("Cat"),
    Dog("Dog"),
    Ferret("Ferret");

    companion object {
        val mapping = PetType.values().associateBy(PetType::type)
        fun lookup(type: String) = mapping[type] ?: throw Exception("No Pet Type: $type")
    }
}