Mastering Kotlin

Creating your starting point

Following the outline of our target DSL syntax, our first step is to create some type of order object that can then be configured:

1. To do this, we'll start by creating an Order class to hold our order of pizza:

class Order(val id: String)

We've created this as a simple class with a single id property so that orders can be unique.

2. Next, we'll create an Item class that can be added to an Order class:

abstract class Item(val name: String)

3. Now, we'll add a map of Item and counts to our Order class:

class Order(val id: String) : Item("Order")  {    val items: MutableMap<Item, Int> = mutableMapOf()}

4. With our Item map in place, we're ready to create an order. To do this, we'll create a top-level function:

fun order ...