whenOrNull<TResult extends Object?> method

  1. @optionalTypeArgs
TResult? whenOrNull<TResult extends Object?>(
  1. TResult? $default(
    1. String paymentDescription,
    2. String managementUrl,
    3. PaymentElementRecurringPaymentProperties? trialBilling,
    4. PaymentElementRecurringPaymentProperties? regularBilling,
    )?
)

A variant of when that fallback to returning null

It is equivalent to doing:

switch (sealedClass) {
  case Subclass(:final field):
    return ...;
  case _:
    return null;
}

Implementation

@optionalTypeArgs TResult? whenOrNull<TResult extends Object?>(TResult? Function( String paymentDescription,  String managementUrl,  PaymentElementRecurringPaymentProperties? trialBilling,  PaymentElementRecurringPaymentProperties? regularBilling)?  $default,) {final _that = this;
switch (_that) {
case _PaymentElementAppleRecurringRequest() when $default != null:
return $default(_that.paymentDescription,_that.managementUrl,_that.trialBilling,_that.regularBilling);case _:
  return null;

}
}