How to return result or error?

Question

go

I have a function that can return a struct or an error. But when I write return nil, err, I get an error
func Start() (RestResponse, error) {

if err != nil {
  return nil, err
}

cannot convert nil (untyped nil value) to RestResponse

Answer 1

To return nil, the type must be a reference type,
or you can return an error like this:

if err != nil {
  return RestResponse{}, err
}