contains method

bool contains (String key)

Tests whether a property exists or not. This can be less expensive than value(forKey:), because it does not have to allocate an object for the property value.

  • Parameter key: The key.
  • Returns: True of the property exists, otherwise false.

Implementation

bool contains(String key) {
  if (_data != null && _data.isNotEmpty && _data.containsKey(key)) {
    return true;
  } else {
    return false;
  }
}