在Lua中计算表中整数的频率最好的方法是什么？

function calculateFrequency(tbl)
  local frequency = {}
  
  for i = 1, #tbl do
    local num = tbl[i]
    if type(num) == "number" and math.floor(num) == num then
      if frequency[num] then
        frequency[num] = frequency[num] + 1
      else
        frequency[num] = 1
      end
    end
  end
  
  return frequency
end

-- 测试代码
local table1 = {1, 2, 3, 3, 4, 5, 5, 5}
local table2 = {3, 5, 3, 2, 1, 4, 5, 2, 1, 5}

local result1 = calculateFrequency(table1)
local result2 = calculateFrequency(table2)

-- 打印结果
for num, freq in pairs(result1) do
  print(num, ":", freq)
end

for num, freq in pairs(result2) do
  print(num, ":", freq)
end