when<TResult extends Object?> method

  1. @optionalTypeArgs
TResult when<TResult extends Object?>(
  1. TResult $default(
    1. BillingDetails? billingDetails
    ), {
  2. required TResult id(
    1. String id
    ),
})

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: "billing_details")  BillingDetails? billingDetails)  $default,{required TResult Function( String id)  id,}) {final _that = this;
switch (_that) {
case _IdP24PaymentMethodDetailsIdOnly():
return id(_that.id);case _P24PaymentMethodDetailsWithBilling():
return $default(_that.billingDetails);case _:
  throw StateError('Unexpected subclass');

}
}