Beginner Projects

Build these with nothing but what Level 1 covered — print, stdin.readLineSync, variables, null safety, conditionals, loops, collections, and functions. Each one fits in a single .dart file with a main function.

1. Command-Line Calculator

Read two numbers and an operator (+ - * /) with stdin.readLineSync() (from dart:io), convert them with double.tryParse, and compute the result with a switch expression. Print clear messages for invalid numbers, an unknown operator, or division by zero.

Hint: double.tryParse('abc') returns null — handle it with ?? or an if (x == null) check.

2. Number Guessing Game

Pick a secret number with Random().nextInt(100) + 1 (from dart:math), then loop, reading guesses and printing "Too high" or "Too low" until the player gets it right. Count and print the attempts.

3. To-Do List

Keep tasks in a List<({String title, bool done})> — a list of records. Loop over a menu (add / list / done / quit) handled with switch, and print numbered tasks with [x] or [ ] markers.

4. Unit Converter

Store conversion factors in a map ({'km→mi': 0.621371, ...}), list the options, and convert the number the user enters. Format results with value.toStringAsFixed(2).

5. Password Generator

Ask for a length, then build a password from a pool of letters, digits, and symbols using Random.secure(). Refuse lengths under 8.

6. Simple Quiz

Store questions and answers in a list of records, ask each one, compare answers ignoring case with toLowerCase(), and print a final score like You scored 4/5.

7. Word Frequency Counter

Split a paragraph into lowercase words, count them in a Map<String, int> with update(word, (n) => n + 1, ifAbsent: () => 1), and print the five most common words.