when<TResult extends Object?> method

@optionalTypeArgs TResult when<TResult extends Object?>(TResult $default(String? email, int? level, String id, VmessSecurity? security, String? experiments,))

A switch-like method, using callbacks.

As opposed to map, this offers destructuring. It is equivalent to doing:

switch (sealedClass) {
  case Subclass(:final field):
    return ...;
  case Subclass2(:final field2):
    return ...;
}

Implementation

@optionalTypeArgs
TResult when<TResult extends Object?>(
  TResult Function(String? email, int? level, String id,
          VmessSecurity? security, String? experiments)
      $default,
) {
  final _that = this;
  switch (_that) {
    case _VMessUser():
      return $default(_that.email, _that.level, _that.id, _that.security,
          _that.experiments);
    case _:
      throw StateError('Unexpected subclass');
  }
}