Step 1 - List (ordered, allows duplicates)

void main() {
  List<String> fruits = ['apple', 'banana', 'apple'];
  fruits.add('orange');
  print(fruits);
}

• Keeps insertion order.
• Duplicate values are allowed.

Step 2 - Set (unique values only)

void main() {
  Set<String> tags = {'dart', 'beginner', 'dart'};
  tags.add('practice');
  print(tags);
}

• Duplicate values are removed automatically.

Step 3 - Map (key -> value)

void main() {
  Map<String, int> scores = {'Asha': 90, 'Rafi': 82};
  scores['Nina'] = 88;
  print(scores['Asha']);
  print(scores);
}

• Use keys to find values quickly.
• Key and value types can be different.

When to use which

Practice tasks

• Store 5 names in a List<String>.
• Remove duplicates from a list by converting to Set.
• Create a Map<String, double> for product prices.