Challenge 2: A Simple Menu DSL — Solution

class Menu {
    private val items = mutableListOf<String>()

    fun item(name: String, price: Double) {
        items.add("$name — $price")
    }

    fun printMenu() {
        items.forEach { println(it) }
    }
}

fun menu(init: Menu.() -> Unit): Menu {
    val m = Menu()
    m.init()
    return m
}

fun main() {
    val dinnerMenu = menu {
        item("Margherita Pizza", 12.50)
        item("Caesar Salad", 8.00)
        item("Tiramisu", 6.50)
    }

    dinnerMenu.printMenu()
}

/*
Output:
Margherita Pizza — 12.5
Caesar Salad — 8.0
Tiramisu — 6.5

Notes:
- menu(init: Menu.() -> Unit) follows the exact same shape as the
  chapter's html(init: Html.() -> Unit) — create the object, run the
  lambda against it as receiver, return the object.
- Inside the menu { } block, item(...) is callable directly with no
  prefix, since the lambda's implicit receiver is the Menu instance
  being built.
- Each item(...) call appends one formatted string to the Menu's private
  items list, later printed by printMenu().
*/