whenOrNull<TResult extends Object?> method

  1. @optionalTypeArgs
TResult? whenOrNull<TResult extends Object?>(
  1. TResult? $default(
    1. PaymentElementLayout? layout,
    2. PaymentElementDefaultValues? defaultValues,
    3. PaymentElementBusiness? business,
    4. dynamic paymentMethodOrder,
    5. PaymentElementFields? fields,
    6. bool? readOnly,
    7. PaymentElementOptionsTerms? terms,
    8. PaymentElementWalletOptions? wallets,
    9. PaymentElementApplePayOptions? applePay,
    )?
)

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( PaymentElementLayout? layout,  PaymentElementDefaultValues? defaultValues,  PaymentElementBusiness? business,  dynamic paymentMethodOrder,  PaymentElementFields? fields,  bool? readOnly,  PaymentElementOptionsTerms? terms,  PaymentElementWalletOptions? wallets,  PaymentElementApplePayOptions? applePay)?  $default,) {final _that = this;
switch (_that) {
case _PaymentElementOptions() when $default != null:
return $default(_that.layout,_that.defaultValues,_that.business,_that.paymentMethodOrder,_that.fields,_that.readOnly,_that.terms,_that.wallets,_that.applePay);case _:
  return null;

}
}