whenOrNull<TResult extends Object?> method

  1. @optionalTypeArgs
TResult? whenOrNull<TResult extends Object?>(
  1. TResult? $default(
    1. String name,
    2. String? description,
    3. String? sku,
    4. String? quantity,
    5. PPItemCategory? category,
    6. PPUnitAmount? tax,
    7. PPUnitAmount unitAmount,
    )?
)

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 name,
          String? description,
          String? sku,
          String? quantity,
          PPItemCategory? category,
          PPUnitAmount? tax,
          PPUnitAmount unitAmount)?
      $default,
) {
  final _that = this;
  switch (_that) {
    case _PPItems() when $default != null:
      return $default(_that.name, _that.description, _that.sku,
          _that.quantity, _that.category, _that.tax, _that.unitAmount);
    case _:
      return null;
  }
}