(T?) -> T

fun <T: Any> replaceNullWithDefault(value: T?, default: T):T = value ?: default

private val <R> KProperty1<out Bufferizable, R>.size: Int
        get() = when (returnType) {
            Int::class.defaultType -> Int.BYTES // Ok
            Array<Int>::class.defaultType -> 4 // Dummy, but it doent work
            Array<Any?>::class.defaultType -> 5 // Neither, same with `out`
            else -> throw Error(toString()) // Always throws
        }

enum MyEnum {
    FOO, BAR
    constructor(string): MyEnum? { when (string) "x" -> FOO, "y" -> BAR, else -> null }
}

companion object

operator fun invoke

enum MyEnum: String {
    case foo = "foo"
    case bar = "bar"
}

enum class MyEnum(val id: String) {
    foo("x"),
    bar("y");
    companion object {
        val byId = values().associateBy { it.id }
    }
}
val enum = MyEnum.byId["x"] // returns foo

id

it.name

@JvmOverloads

init

class CustomView @JvmOverloads constructor(
    context: Context, attrs: AttributeSet? = null, defStyleAttr: Int = 0
) : View(context, attrs, defStyleAttr) {
}

init { }