when<TResult extends Object?> method

  1. @optionalTypeArgs
TResult when<TResult extends Object?>(
  1. TResult $default(
    1. String country,
    2. String currency,
    3. PlatformPayWebPaymentItem total,
    4. List<PlatformPayWebPaymentItem> displayItems,
    5. bool requestPayerName,
    6. bool requestPayerEmail,
    7. bool requestPayerPhone,
    8. bool requestShipping,
    9. List<PlatformPayWebShippingOption> shippingOptions,
    10. List<PlatformPayWebWalletType> disableWallets,
    )
)

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 country,  String currency,  PlatformPayWebPaymentItem total,  List<PlatformPayWebPaymentItem> displayItems,  bool requestPayerName,  bool requestPayerEmail,  bool requestPayerPhone,  bool requestShipping,  List<PlatformPayWebShippingOption> shippingOptions,  List<PlatformPayWebWalletType> disableWallets)  $default,) {final _that = this;
switch (_that) {
case _PaymentRequestCreateOptions():
return $default(_that.country,_that.currency,_that.total,_that.displayItems,_that.requestPayerName,_that.requestPayerEmail,_that.requestPayerPhone,_that.requestShipping,_that.shippingOptions,_that.disableWallets);case _:
  throw StateError('Unexpected subclass');

}
}