Kotlin Programming: The Big Nerd Ranch Guide, 2nd Edition

Class Functions

Class definitions can specify two types of content: behavior and data. In NyetHack, a player should be able to take various actions: perform combat, move, cast a spell, or check their inventory, for example. You define behavior for a class by adding function definitions to its class body. Functions defined within a class are called class functions.

You already have some player data defined in NyetHack. You will be moving that into the Player class and introducing a few behaviors and new pieces of data.

Define the first Player behavior by adding a function to allow the player to cast a spell:

Listing 13.3  Defining a class function (Player.kt)

class Player {
    fun castFireball(numFireballs: Int = 2) {
        narrate("A ...