如何使用bufio检查用户输入是否为空？

I'm new with Go syntax, just trying to pass an error if the user did not input anything...

[EDIT] I would like the following function to stop running if the user did not input anything, and print a log. My if required && answer == "" statement doesn't seem to work as "You must enter a value." does not log when the user does not input anything.

func QAR(q string, r string, required bool) string {
  reader := bufio.NewReader(os.Stdin)

  // Print the question
  fmt.Printf(q)
  answer, _ := reader.ReadString('
')

  // If the answer is empty, return a log
  if required && answer == "" {
    log.Fatal("You must enter a value.")

    // Can I just use return to block it?
    return
  }

  // Print the response with the answer
  if r != "" {
    fmt.Println(r, answer)
  }

  return answer
}

The typical pattern in go is to return multiple values, the last of which is an error, if one occurred. So your function signature could look like this:

func QAR(q string, r string, required bool) (string, error)

And the return statements like this:

return "", fmt.Errorf("user provided no input")
// ...
return answer, nil

[EDIT]

Note that bufio.Reader.ReadString(...) includes the delimiter, so you probably need to check if answer == " ".