ncomet

sealed class BookingOutcome

ncomet

sealed class BookingOutcome

class RoomBooked(key: Key, bookingRange: ClosedRange<Instant>) : BookingOutcome()
object RoomNotAvailable : BookingOutcome()
object HotelClosed : BookingOutcome()

ncomet

interface BookingService {
    fun bookRoom(roomId: RoomID): BookingOutcome
}

ncomet

val outcome = bookingService.bookRoom(RoomID("roomIwant"))

when (outcome) {

}

ncomet

// we create a sequence that generates prime numbers
fun primes(): Sequence<Long> {
    var i = 2L
    return generateSequence { i++ }
            .filter { n -> (2L until n).none { n % it == 0L } }
}

// we map chars to a unique prime
val charToPrime = ('a'..'z').zip(primes().take(26).toList()).toMap()

ncomet

"""{
    "cat": "meow",
    "dog": "woof"
}""".trimIndent()

ncomet

"""
  |{
  |  "cat": "meow",
  |  "dog": "woof"
  |}
""".trimMargin()

ncomet

val obj = obj {
  "key" to 3.4
  "anotherKey" to arr["test", "test2", 1, 2.433, true]
  "nullValue" to null
  "emptyObject" to obj { }
  "emptyArray" to arr
  "custom" to ZonedDateTime.now()
}

println(obj) // 1

ncomet

{"key":3.4,"anotherKey":["test","test2",1,2.433,true],"nullValue":null,"emptyObject":{},"emptyArray":[],"custom":"2020-07-15T10:59:19.042965+02:00[Europe/Paris]"}

ncomet

{
  "key": 3.4,
  "anotherKey": [
    "test",
    "test2",
    1,
    2.433,
    true
  ],
  "nullValue": null,