whenOrNull<TResult extends Object?> method

  1. @optionalTypeArgs
TResult? whenOrNull<TResult extends Object?>(
  1. TResult? $default(
    1. PaymentElementFieldRequired line1,
    2. PaymentElementFieldRequired line2,
    3. PaymentElementFieldRequired city,
    4. PaymentElementFieldRequired state,
    5. PaymentElementFieldRequired country,
    6. PaymentElementFieldRequired postalCode,
    )?
)

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( PaymentElementFieldRequired line1,  PaymentElementFieldRequired line2,  PaymentElementFieldRequired city,  PaymentElementFieldRequired state,  PaymentElementFieldRequired country,  PaymentElementFieldRequired postalCode)?  $default,) {final _that = this;
switch (_that) {
case _PaymentElementAddressFields() when $default != null:
return $default(_that.line1,_that.line2,_that.city,_that.state,_that.country,_that.postalCode);case _:
  return null;

}
}