whenOrNull<TResult extends Object?> method

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

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

}
}