mapOrNull<TResult extends Object?> method

  1. @optionalTypeArgs
TResult? mapOrNull<TResult extends Object?>({
  1. TResult? cancel(
    1. BaseApiCancelException value
    )?,
  2. TResult? connectionTimeout(
    1. BaseApiConnectionTimeoutException value
    )?,
  3. TResult? sendTimeout(
    1. BaseApiSendTimeoutException value
    )?,
  4. TResult? receiveTimeout(
    1. BaseApiReceiveTimeoutException value
    )?,
  5. TResult? badCertificate(
    1. BaseApiBadCertificateException value
    )?,
  6. TResult? connectionError(
    1. BaseApiConnectionErrorException value
    )?,
  7. TResult? badResponse(
    1. BaseApiBadResponseException value
    )?,
  8. TResult? businessException(
    1. BaseApiBusinessException value
    )?,
})

A variant of map that fallback to returning null.

It is equivalent to doing:

switch (sealedClass) {
  case final Subclass value:
    return ...;
  case _:
    return null;
}

Implementation

@optionalTypeArgs
TResult? mapOrNull<TResult extends Object?>({
  TResult? Function(BaseApiCancelException value)? cancel,
  TResult? Function(BaseApiConnectionTimeoutException value)?
      connectionTimeout,
  TResult? Function(BaseApiSendTimeoutException value)? sendTimeout,
  TResult? Function(BaseApiReceiveTimeoutException value)? receiveTimeout,
  TResult? Function(BaseApiBadCertificateException value)? badCertificate,
  TResult? Function(BaseApiConnectionErrorException value)? connectionError,
  TResult? Function(BaseApiBadResponseException value)? badResponse,
  TResult? Function(BaseApiBusinessException value)? businessException,
}) {
  final _that = this;
  switch (_that) {
    case BaseApiCancelException() when cancel != null:
      return cancel(_that);
    case BaseApiConnectionTimeoutException() when connectionTimeout != null:
      return connectionTimeout(_that);
    case BaseApiSendTimeoutException() when sendTimeout != null:
      return sendTimeout(_that);
    case BaseApiReceiveTimeoutException() when receiveTimeout != null:
      return receiveTimeout(_that);
    case BaseApiBadCertificateException() when badCertificate != null:
      return badCertificate(_that);
    case BaseApiConnectionErrorException() when connectionError != null:
      return connectionError(_that);
    case BaseApiBadResponseException() when badResponse != null:
      return badResponse(_that);
    case BaseApiBusinessException() when businessException != null:
      return businessException(_that);
    case _:
      return null;
  }
}