working with map on flutter code example

Example 1: flutter create new map

Map<String, int> map1 = {'zero': 0, 'one': 1, 'two': 2};
Map map2 = {'zero': 0, 'I': 'one', 10: 'X'};
var map3 = {'zero': 0, 'I': 'one', 10: 'X'};

Example 2: dart key value pair list

void main() {
  final testMap = {"a": 1, "b": 2, "c": 3, "d": 4, "e": 5};
  for (final mapEntry in testMap.entries) {
    final key = mapEntry.key;
    final value = mapEntry.value;
    print('Key: $key, Value: $value');  // Key: a, Value: 1 ...
  }
}