(()=>{
    outer:
    for(let j = 2; j <= 9; j++){
        let line_output = ""
        for(let i = 1; i <= 9; i++){
            line_output += `${j}x${i}=${j*i},\t`
            if(i > 3 && j > 5){
                console.log(line_output)
                break outer
            }
        }
        console.log(line_output)
    }
})()

for j = 2, 9, 1 do
  for i = 1, 9, 1 do
    io.write(string.format("%2dx%2d=%2d, \t", j, i, j*i))
    
    if i > 3 and j > 5 then
      goto finish
    end
  end
  print()  -- new line
end

::finish::
print() -- new line

function outer()
  local function inner()
    print("inner")
    goto outer_label -- 無法成功跳轉，會報錯
  end

  inner()
  print("outer")
  ::outer_label::
end

function div(a,b)

  ::start::
  a = tonumber(a)
  b = tonumber(b)
  if a and b then
    if b == 0 then
      print("b must be a number, but not 0.")
      goto restart_case
    end
    return a/b
  else
    goto restart_case
  end


  ::restart_case::
  local restart_case = {"Break"}

  if a then
    table.insert(restart_case, "Use Value")
    table.insert(restart_case, "Return Value")
  end

  print("Please Select Restart Case[1-" .. #restart_case .. "]:")
  for i, restart in ipairs(restart_case) do
    print(i, restart)
  end

  select = restart_case[tonumber(io.read())]
  print("Select ", select)
  if select == "Break" then
    goto finish
  elseif select == "Use Value" then
    goto use_value
  elseif select == "Return Value" then
    goto return_value
  else
    goto restart_case
  end

  ::return_value::
  do
    io.write("Return Value: ")
    return tonumber(io.read())
  end

  ::use_value::
  io.write("Use Value: ")
  b = tonumber(io.read())
  goto start

  ::finish::
end