Dart nested Map getter/setter

1T? mapGetter<T>(Map map, String path, T defaultValue) {
2  List<String> keys = path.split('.');
3  String key = keys[0];
4
5  if (!map.containsKey(key)) {
6    return defaultValue;
7  }
8
9  if (keys.length == 1) {
10    return map[key] as T;
11  }
12
13  return mapGetter(map[keys.removeAt(0)], keys.join('.'), defaultValue);
14}
15

1 Map<String, dynamic> a = {
2    'a': {
3      'b': {
4        'c': {
5          'd': 'This is d',
6        },
7      }
8    }
9  };
10
11  Map<String, dynamic>? c = mapGetter<Map<String, dynamic>>(a, 'a.b.c', {});
12  String? d = mapGetter(a, 'a.b.c.d', 'no value');
13  String? e = mapGetter(a, 'a.b.c.e', 'no value');
14  print(c);
15  print(d);
16  print(e);
17

1{d: This is d}
2This is d
3no value
4

1Map<String, dynamic> mapSetter<T>(
2  Map<String, dynamic>? map,
3  String path,
4  T value,
5) {
6  List<String> keys = path.split('.');
7  String key = keys[0];
8  Map<String, dynamic> target = map ?? {};
9
10  if (keys.length == 1) {
11    return Map<String, dynamic>.from({
12      ...target,
13      key: value,
14    });
15  }
16
17  return Map<String, dynamic>.from({
18    ...target,
19    key: mapSetter(target[keys.removeAt(0)] ?? {}, keys.join('.'), value),
20  });
21}
22

1  Map<String, dynamic> a = {
2    'a': {
3      'b': {
4        'c': {
5          'd': 'This is d',
6        },
7      }
8    }
9  };
10
11  Map<String, dynamic> d = mapSetter(a, 'a.b.c.d', 'This is d modified');
12  Map<String, dynamic> e = mapSetter(d, 'a.b.c.e', 'This is e');
13  print(d);
14  print(e);
15

1{a: {b: {c: {d: This is d modified}}}}
2{a: {b: {c: {d: This is d modified, e: This is e}}}}
3