whenOrNull<TResult extends Object?> method

  1. @optionalTypeArgs
TResult? whenOrNull<TResult extends Object?>(
  1. TResult? $default(
    1. DateTime generatedAt,
    2. DateTime startDate,
    3. DateTime endDate,
    4. Sub2ApiAdminUsageGranularity granularity,
    5. Sub2ApiAdminDashboardSnapshotStats? stats,
    6. List<Sub2ApiAdminDashboardTrendPoint>? trend,
    7. List<Sub2ApiAdminDashboardModelStats>? models,
    8. List<Sub2ApiAdminDashboardGroupStats>? groups,
    9. List<Sub2ApiAdminUserUsageTrendPoint>? usersTrend,
    )?
)

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 generatedAt,
    DateTime startDate,
    DateTime endDate,
    Sub2ApiAdminUsageGranularity granularity,
    Sub2ApiAdminDashboardSnapshotStats? stats,
    List<Sub2ApiAdminDashboardTrendPoint>? trend,
    List<Sub2ApiAdminDashboardModelStats>? models,
    List<Sub2ApiAdminDashboardGroupStats>? groups,
    List<Sub2ApiAdminUserUsageTrendPoint>? usersTrend,
  )?
  $default,
) {
  final _that = this;
  switch (_that) {
    case _Sub2ApiAdminDashboardSnapshot() when $default != null:
      return $default(
        _that.generatedAt,
        _that.startDate,
        _that.endDate,
        _that.granularity,
        _that.stats,
        _that.trend,
        _that.models,
        _that.groups,
        _that.usersTrend,
      );
    case _:
      return null;
  }
}