Projects: Module 01 — Introduction to Kotlin¶

Project ideas that apply the concepts from this module. Build something real.

Beginner Projects¶

Project 1: Personal Finance Tracker CLI¶

Build a command-line tool that tracks income and expense entries.

What you'll build: - A data class Transaction(val id: Int, val amount: Double, val description: String, val type: TransactionType) - A sealed class TransactionType with Income and Expense subclasses - Functions to add transactions, list them, and print a summary (total income, total expenses, balance) - Persistence to a simple text file (one transaction per line, CSV format)

Acceptance criteria: - add income 500.00 "Freelance payment" stores an income transaction - add expense 45.50 "Groceries" stores an expense - summary prints total income, total expenses, and current balance - All data persists to disk and loads on next run

This project tests: data class, sealed classes, file I/O, null safety, string templates, when.

Project 2: Wordle Clone (Console)¶

Implement the popular Wordle word game in the terminal.

What you'll build: - A list of 5-letter target words - Turn-based input loop (6 guesses maximum) - Feedback: [G] for correct position, [Y] for wrong position, [-] for not present - Track the game state with a sealed class: Playing(guessesLeft: Int), Won(attempts: Int), Lost(target: String)

Acceptance criteria: - Clear per-turn feedback display - Case-insensitive input handling - Proper handling of repeated letters - Game summary on win or loss

This project tests: Sealed classes, when, val/var, list operations, loops, input reading.

My Projects¶

Track your module 01 projects here.