bat/tests/syntax-tests/highlighted/Kotlin/test.kt

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Kotlin
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2020-10-04 22:14:58 +02:00
import kotlin.math.*
data class Example(
 val name: String,
 val numbers: List<Int?>
)
fun interface JokeInterface {
 fun isFunny(): Boolean
}
abstract class AbstractJoke : JokeInterface {
 override fun isFunny() = false
 abstract fun content(): String
}
class Joke : AbstractJoke() {
 override fun isFunny(): Boolean {
 return true
 }
 override fun content(): String = "content of joke here, haha"
}
class DelegatedJoke(val joke: Joke) : JokeInterface by joke {
 val number: Long = 123L
 companion object {
 const val someConstant = "some constant text"
 }
}
object SomeSingleton
sealed class Shape {
 abstract fun area(): Double
}
data class Square(val sideLength: Double) : Shape() {
 override fun area(): Double = sideLength.pow(2)
}
object Point : Shape() {
 override fun area() = .0
}
class Circle(val radius: Double) : Shape() {
 override fun area(): Double {
 return PI * radius * radius
 }
}
fun String.extensionMethod() = "test"
fun main() {
 val name = """
 multiline
 string
 
 some numbers: 123123 42
 """.trimIndent()
 val example = Example(name = name, numbers = listOf(512, 42, null, -1))
 example.numbers
 .filterNotNull()
 .forEach { println(it) }
 setOf(Joke(), DelegatedJoke(Joke()).joke)
 .filter(JokeInterface::isFunny)
 .map(AbstractJoke::content)
 .forEachIndexed { index: Int, joke ->
 println("I heard a funny joke(#${index + 1}): $joke")
 }
 listOf(Square(12.3), Point, Circle(5.2))
 .associateWith(Shape::area)
 .toList()
 .sortedBy { it.second }
 .forEach {
 println("${it.first}: ${it.second}")
 }
 println("some string".extensionMethod())
 require(SomeSingleton::class.simpleName == "SomeSingletonName") { "something does not seem right..." }
}