main() (json: Text) {
  total = reduce(add, [1, 2, 3], 0)
  json = dever.json.stringify(
    dever.json.parse("{\"message\":\"你好 Dever\",\"total\":" + int.to_text(total) + "}")
  )
}

add(value: Int, total: Int) (next: Int) {
  next = total + value
}