when<TResult extends Object?> method

@optionalTypeArgs TResult when<TResult extends Object?>(TResult $default(String id, String email, String currencyCode, String customerUrl, LineItemsOrder lineItems, String name, int orderNumber, String processedAt, ShippingAddress? shippingAddress, ShippingAddress? billingAddress, String statusUrl, PriceV2 subtotalPrice, PriceV2 totalPrice, PriceV2 totalShippingPrice, PriceV2 totalTax, String financialStatus, String fulfillmentStatus, PriceV2? totalRefunded, String? phone, String? cursor, String? canceledAt, String? cancelReason, List<SuccessfulFullfilment>? successfulFulfillments,))

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( String id,  String email,  String currencyCode,  String customerUrl,  LineItemsOrder lineItems,  String name,  int orderNumber,  String processedAt,  ShippingAddress? shippingAddress,  ShippingAddress? billingAddress,  String statusUrl,  PriceV2 subtotalPrice,  PriceV2 totalPrice,  PriceV2 totalShippingPrice,  PriceV2 totalTax,  String financialStatus,  String fulfillmentStatus,  PriceV2? totalRefunded,  String? phone,  String? cursor,  String? canceledAt,  String? cancelReason,  List<SuccessfulFullfilment>? successfulFulfillments)  $default,) {final _that = this;
switch (_that) {
case _Order():
return $default(_that.id,_that.email,_that.currencyCode,_that.customerUrl,_that.lineItems,_that.name,_that.orderNumber,_that.processedAt,_that.shippingAddress,_that.billingAddress,_that.statusUrl,_that.subtotalPrice,_that.totalPrice,_that.totalShippingPrice,_that.totalTax,_that.financialStatus,_that.fulfillmentStatus,_that.totalRefunded,_that.phone,_that.cursor,_that.canceledAt,_that.cancelReason,_that.successfulFulfillments);case _:
  throw StateError('Unexpected subclass');

}
}