Reflection to avoid duplicating very similar methods

gist.go

func (sm SAPSystemsMap) GetSIDsString() string {
	return getSIDsString(reflect.ValueOf(sm))
}

func (sl SAPSystemsList) GetSIDsString() string {
	return getSIDsString(reflect.ValueOf(sl))
}

func getSIDsString(v reflect.Value) string {
	var s []string
	for v.Kind() == reflect.Ptr || v.Kind() == reflect.Interface {
		v = v.Elem()
	}
	switch v.Kind() {
	case reflect.Array, reflect.Slice:
		for i := 0; i < v.Len(); i++ {
			s = append(s, getSIDsString(v.Index(i)))
		}
	case reflect.Map:
		for _, k := range v.MapKeys() {
			s = append(s, getSIDsString(v.MapIndex(k)))
		}
	default:
		return v.Interface().(SAPSystem).SID
	}

	return strings.Join(s, ",")
}