filterMapKeys function
filter map keys includes $
#
Implementation
Map<String, dynamic> filterMapKeys(Map<String, dynamic> map) {
final result = <String, dynamic>{};
for (var item in map.entries) {
if (item.key.contains('#')) continue;
if (item.key.contains(r'$')) continue;
result.putIfAbsent(item.key, () => item.value);
}
return result;
}