Hydroxide modification illustrating folder/label filtering

func (c *Client) ListLabels() ([]*Label, error) {
    req, err := c.newRequest(http.MethodGet, "/labels", nil)
    if err != nil {
        return nil, err
    }

    var respData struct {
        resp
        Labels []*Label
    }
    if err := c.doJSON(req, &respData); err != nil {
        return nil, err
    }
    var filteredLabels []*Label
    for _, label := range respData.Labels {
        if label.Type == 4 || label.Name == "[Bulk]" || label.Name == "Bulk" || label.Name == "Newsletters" {
            filteredLabels = append(filteredLabels, label)
            log.Printf(">> added label %v", label.Name)
        } else {
            log.Printf(">> discarding label %v", label.Name)
        }
    }

    return filteredLabels, nil
}