whenOrNull<TResult extends Object?> method

  1. @optionalTypeArgs
TResult? whenOrNull<TResult extends Object?>(
  1. TResult? $default(
    1. bool isSuccess,
    2. String sign,
    3. String liveRate,
    4. String similarity,
    5. String? error,
    6. String? errorDomain,
    7. String? errorCode,
    8. String? errorDescription,
    9. String? errorReason,
    )?
)

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( bool isSuccess,  String sign,  String liveRate,  String similarity,  String? error,  String? errorDomain,  String? errorCode,  String? errorDescription,  String? errorReason)?  $default,) {final _that = this;
switch (_that) {
case _FaceVerifyResult() when $default != null:
return $default(_that.isSuccess,_that.sign,_that.liveRate,_that.similarity,_that.error,_that.errorDomain,_that.errorCode,_that.errorDescription,_that.errorReason);case _:
  return null;

}
}