flatMap<R extends Object> method

@override Result<R> flatMap<R extends Object>(@noFutures Result<R> noFutures(T value))

Returns noFutures(value), absorbing any throw from the callback into an Err. The return type is widened from Ok<R> to Result<R> so the absorbed error has a place to live.

Implementation

@override
@pragma('vm:prefer-inline')
Result<R> flatMap<R extends Object>(
  @noFutures Result<R> Function(T value) noFutures,
) {
  try {
    return noFutures(unwrap());
  } on Err catch (err) {
    // Preserve a user-thrown Err's statusCode/breadcrumbs verbatim — the
    // package contract is that thrown Err values propagate without being
    // re-wrapped.
    return err.transfErr<R>();
  } catch (error, stackTrace) {
    return Err<R>(error, stackTrace: stackTrace);
  }
}