update static method

dynamic update(Map? json, String path, dynamic newValue)

Implementation

static dynamic update(Map<dynamic, dynamic>? json, String path, dynamic newValue) {
  json ??= {};

  if (path.isEmpty) return newValue;
  final parts = path.split('.');
  if (parts.isEmpty) return newValue;

  final key = parts.first;
  final restPath = parts.sublist(1).join('.');

  // Try to parse key as int for List index access
  final index = int.tryParse(key);

  // Handle Map case (or create a Map if input is null)
  if (index == null) {
    final updated = Map<dynamic, dynamic>.from(json);
    if (restPath.isEmpty) {
      updated[key] = newValue;
      return updated;
    }
    updated[key] = update(updated.containsKey(key) ? updated[key] : null, restPath, newValue);
    return updated;
  }
  // Handle List case (or create a List if input is null)
  else if (index >= 0) {
    final list = List<dynamic>.from(json.values);
    // Expand list if necessary
    while (list.length <= index) {
      list.add(null);
    }
    if (restPath.isEmpty) {
      list[index] = newValue;
      return list;
    }
    list[index] = update(list[index], restPath, newValue);
    return list;
  }
  // If path is at leaf but input is neither Map nor List, try to create Map or List if possible
  else if (restPath.isEmpty) {
    if (index >= 0) {
      // key is int -> create a list with newValue at index
      final list = List.filled(index + 1, null, growable: true);
      list[index] = newValue;
      return list;
    }
  }
  // Invalid path, return input unchanged
  return json;
}