whenOrNull<TResult extends Object?> method

@optionalTypeArgs TResult? whenOrNull<TResult extends Object?>(TResult? $default(DateTime? startDate, DateTime? endDate, String? timezone, Sub2ApiAdminUsageGranularity granularity, int? limit,)?)

A variant of when that fallback to returning null

It is equivalent to doing:

switch (sealedClass) {
  case Subclass(:final field):
    return ...;
  case _:
    return null;
}

Implementation

@optionalTypeArgs
TResult? whenOrNull<TResult extends Object?>(
  TResult? Function(
    DateTime? startDate,
    DateTime? endDate,
    String? timezone,
    Sub2ApiAdminUsageGranularity granularity,
    int? limit,
  )?
  $default,
) {
  final _that = this;
  switch (_that) {
    case _Sub2ApiAdminEntityTrendQuery() when $default != null:
      return $default(
        _that.startDate,
        _that.endDate,
        _that.timezone,
        _that.granularity,
        _that.limit,
      );
    case _:
      return null;
  }
}