Dart Map.addEntries用法及代码示例

将 newEntries 的所有键/值对添加到此映射。

如果 newEntries 的键已在此映射中，则相应的值将被覆盖。

该操作相当于对迭代的每个MapEntry 执行this[entry.key] = entry.value。

final planets = <int, String>{1: 'Mercury', 2: 'Venus',
  3: 'Earth', 4: 'Mars'};
final gasGiants = <int, String>{5: 'Jupiter', 6: 'Saturn'};
final iceGiants = <int, String>{7: 'Uranus', 8: 'Neptune'};
planets.addEntries(gasGiants.entries);
planets.addEntries(iceGiants.entries);
print(planets);
// {1: Mercury, 2: Venus, 3: Earth, 4: Mars, 5: Jupiter, 6: Saturn,
//  7: Uranus, 8: Neptune}