when<TResult extends Object?> method

  1. @optionalTypeArgs
TResult when<TResult extends Object?>(
  1. TResult $default(
    1. String? paymentMethod,
    2. String? returnUrl
    )
)

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(@JsonKey(name: "payment_method")  String? paymentMethod, @JsonKey(name: "return_url")  String? returnUrl)  $default,) {final _that = this;
switch (_that) {
case _ConfirmAlipayPaymentData():
return $default(_that.paymentMethod,_that.returnUrl);case _:
  throw StateError('Unexpected subclass');

}
}