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

Nested Classes

Not all classes defined within other classes are declared as objects. You can also use the class keyword to define a regular class nested inside another class. In this section, you will define a new GameInput class nested within the Game object.

Now that you have defined a game loop, you will want to apply some control over the user input passed to your game. NyetHack is a text adventure, driven by the user entering commands to the readLine function. There are two things you need to ensure about the user’s commands: First, that they are valid commands. Second, that commands with multiple parts, like “move east,” are handled correctly: You want “move” to trigger a move function and “east” to provide the move function ...