whenOrNull<TResult extends Object?> method

  1. @optionalTypeArgs
TResult? whenOrNull<TResult extends Object?>(
  1. TResult? $default(
    1. ShippingDetailsAddress address,
    2. String? carrier,
    3. String? name,
    4. String? phone,
    5. String? trackingNumber,
    )?
)

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( ShippingDetailsAddress address,  String? carrier,  String? name,  String? phone, @JsonKey(name: 'tracking_number')  String? trackingNumber)?  $default,) {final _that = this;
switch (_that) {
case _PaymentElementChangeEvent() when $default != null:
return $default(_that.address,_that.carrier,_that.name,_that.phone,_that.trackingNumber);case _:
  return null;

}
}