Chapter 18 — Final Mini-Project: Dart Dungeon (Console)

Level: intermediate Estimated time: 12 h Prerequisites: chapters 01 through 17 of Part 1A What you will be able to do by the end: design, write, test, and ship a complete Dart application of several hundred lines, organized into models, services, and an entry point, with JSON saving to disk.

18.0 — Chapter Objectives

By the end of this chapter, you will be able to:

• start from a requirements specification and derive a list of entities from it;
• translate those entities into classes, enums, and mixins;
• draw a class diagram and stick to it while writing code;
• organize a real Dart project into bin/, lib/models/, and lib/services/;
• write an abstract class that factors out what several characters have in common;
• encapsulate a collection behind a safe API;
• design domain exceptions and catch them in the right place;
• serialize and deserialize a complete object graph to and from JSON;
• read and validate keyboard input without ever crashing the program;
• write a game loop that stays readable despite its complexity;
• compute statistics with where, map, and fold;
• write unit tests for the game rules;
• review your own code and identify what could be improved.