when<TResult extends Object?> method

@optionalTypeArgs TResult when<TResult extends Object?>(TResult $default(String date, int apiKeyId, String keyName, int requests, int tokens,))

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 date,
    int apiKeyId,
    String keyName,
    int requests,
    int tokens,
  )
  $default,
) {
  final _that = this;
  switch (_that) {
    case _Sub2ApiAdminApiKeyUsageTrendPoint():
      return $default(
        _that.date,
        _that.apiKeyId,
        _that.keyName,
        _that.requests,
        _that.tokens,
      );
    case _:
      throw StateError('Unexpected subclass');
  }
}