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Access & Work with Maps

See how to access the contents of maps and manipulate maps.

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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}');
}

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