an example demonstrating how nice Kotlin can be

main.kts

data class Point(val x: Int, val y: Int)
data class Rectangle(val width: Int, val height: Int)
data class Circle(val radius: Int)

fun describePoint(point: Point) = when (point) {
    Point(0, 0) -> "Origin"
    Point(1, 2) -> "1,2"
    else -> throw IllegalStateException("Unexpected value: $point")
}

fun calculateArea(shape: Any): Double = when (shape) {
    is Rectangle -> (shape.height * shape.width).toDouble()
    is Circle -> Math.PI * shape.radius * shape.radius
    else -> throw IllegalArgumentException("Unknown shape")
}

val point = Point(1, 2)
println(describePoint(point))

val shape = Circle(5)
val area = calculateArea(shape)
println("Area of the shape: $area!")