Programming in Dart: Control Flow & Collections

May 3 2022 · Dart 2.15, DartPad, DartPad

Part 2: More Collections

13. Access & Work with Maps

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Previous episode: 12. Create & Populate Maps Next episode: 14. Challenge: Work with Maps

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Notes: 13. Access & Work with Maps

Apple’s Swift Dictionary documentation: https://api.dart.dev/stable/2.14.4/dart-core/Map-class.html

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In the previous episode, you learned about how to create maps, how key-value storage works, and how to add and update elements in your maps. But there’s a whole lot more to maps than just that!

var namesAndPets = { 'Ron': '🐀 Rat', 'Rincewind': '🛄 Luggage', 'Thor': '🔨 Hammer'  }; 

print(namesAndPets['Rincewind']);

print(namesAndPets['Captain Ahab']);

print(namesAndPets['Captain Ahab'] ?? 'No white whale for Captain Ahab');

print(namesAndPets.isEmpty);

print(namesAndPets.isEmpty);

var pet = namesAndPets.remove('Ron');

print(pet);
print(namesAndPets);

for (var pet in namesAndPets.values) {
    print(pet);
}

for (var name in namesAndPets.keys) {
    print(name);
}

for (var entry in namesAndPets.entries) {
    print('key: ${entry.key} value: ${entry.value}');
}