Remove property with null values and null values from list

remove_nulls.dart

/*
 * Goal: Remove property with null values and null values from list
 * Author: Jorge Wander Santana Urena
 * Source: https://gist.github.com/jorwan/52902870f633da8959a39353e96fac25
 **/

final data = 
  {
    "name": "Carolina Ratliff",
    "company": null,
    "phone": "+1 (919) 488-2302",
    "tags": [
      "commodo",
      null,
      "dolore",
    ],
    "friends": [
      {
        "id": 0,
        "name": null,
        "favorite_fruits": [
          'apple', null, null, 'pear'
        ]
      },
      {
        "id": 1,
        "name": "Pearl Calhoun"
      },
    ],
  };

void main() {
  // From map
  print('Remove nulls from map:\n' + data.removeNulls().toString());
  // From list
  print('\nRemove nulls from list:\n' + [data].removeNulls().toString());
}

Map<String, dynamic> removeNullsFromMap(Map<String, dynamic> json) =>
  json
  ..removeWhere((String key, dynamic value) => value == null)
  ..map<String, dynamic>((key, value) => MapEntry(key, removeNulls(value)));

List removeNullsFromList(List list) => list
  ..removeWhere((value) => value == null)
  ..map((e) => removeNulls(e)).toList();

removeNulls(e) => (e is List)
    ? removeNullsFromList(e)
    : (e is Map ? removeNullsFromMap(e) : e);


extension ListExtension on List {
  List removeNulls() => removeNullsFromList(this);
}

extension MapExtension on Map {
  Map removeNulls() => removeNullsFromMap(this);
}