whenOrNull<TResult extends Object?> method

@optionalTypeArgs TResult? whenOrNull<TResult extends Object?>(TResult? $default(String date, int requests, int inputTokens, int outputTokens, int cacheCreationTokens, int cacheReadTokens, int totalTokens, Sub2ApiDecimal cost, Sub2ApiDecimal actualCost,)?)

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(
    String date,
    int requests,
    int inputTokens,
    int outputTokens,
    int cacheCreationTokens,
    int cacheReadTokens,
    int totalTokens,
    Sub2ApiDecimal cost,
    Sub2ApiDecimal actualCost,
  )?
  $default,
) {
  final _that = this;
  switch (_that) {
    case _Sub2ApiAdminDashboardTrendPoint() when $default != null:
      return $default(
        _that.date,
        _that.requests,
        _that.inputTokens,
        _that.outputTokens,
        _that.cacheCreationTokens,
        _that.cacheReadTokens,
        _that.totalTokens,
        _that.cost,
        _that.actualCost,
      );
    case _:
      return null;
  }
}