when<TResult extends Object?> method

@optionalTypeArgs TResult when<TResult extends Object?>(TResult $default(PPOrderIntent intent, PPProcessingInstruction? processingInstruction, @JsonKey.new(name: 'application_context') PPOrderAppContext? appContext, @JsonKey.new(name: 'purchase_units') List<PPPurchaseUnit> purchaseUnitList,))

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(
          PPOrderIntent intent,
          PPProcessingInstruction? processingInstruction,
          @JsonKey(name: 'application_context') PPOrderAppContext? appContext,
          @JsonKey(name: 'purchase_units')
          List<PPPurchaseUnit> purchaseUnitList)
      $default,
) {
  final _that = this;
  switch (_that) {
    case _PPOrder():
      return $default(_that.intent, _that.processingInstruction,
          _that.appContext, _that.purchaseUnitList);
    case _:
      throw StateError('Unexpected subclass');
  }
}