kotlin demo

fun main(args: Array<String>) {
    println(helloTo("Johan"))
    println(sumOf(1))
    println(sumOf(1, 2))
    println(sumOf(lhs = 1, rhs = 2))
    println(sumOf(1, 2, 3, 4, 5))

    val customer = Customer("Customer", "[email protected]")
    // customer.name = "not allowed, name is val"
    customer.email = "[email protected]"
    println(customer.name)
    println(customer.email)

    val employee = Employee("employee", "Developer")
    println(employee)

    fun Employee.sayHelloTo(name: String) = println("Hello $name")

    employee.sayHelloTo(customer.name)
}

data class Employee(val name: String, val job: String)

class Customer(val name: String, var email: String)

fun helloTo(name: String): String {
    return "Hello $name"
}

fun sumOf(lhs: Int, rhs: Int): Int {
    return lhs + rhs
}

fun sumOf(vararg numbers: Int): Int {
    return numbers.sum()
}