Referenz und Spickzettel

val x = 1            // unveränderlich
var y = 2            // veränderlich
const val C = 3      // Konstante (oberste Ebene)
val t: String? = null
fun f(a: Int, b: Int = 0): Int = a + b

if (a) x else y            when (v) { 1 -> ..; in 2..5 -> ..; is String -> ..; else -> .. }
for (i in 1..10) {}        for (i in 10 downTo 1 step 2) {}      while () {}      do {} while ()
break@label                continue@label                         return@label

class A(val x: Int, var y: Int = 0) : Basis(), Schnittstelle { init {..} }
open class Basis;  abstract class Form;  interface I { fun f() }
data class P(val a: Int)       sealed class S       enum class E { A, B }
object Singleton               companion object { }
override fun / override val    private set         lateinit var      by lazy { }