Lua表差异键功能

Question

我如何检查一个表（作为数组）是否包含另一个表的所有键？类似于PHP中的array_diff_key：https://www.php.net/manual/fr/function.array-diff-key.php

此函数应返回，例如，[“ firstLevel”] [“ e”]，因为此元素在tblTwo中不存在：

tblOne = {
    ["firstLevel"] = {
        ["a"] = "something",
        ["b"] = "something",
        ["c"] = "something",
        ["subLevel"] = {
            ["d"] = "something",
            ["e"] = "something",
        }
    }

tblTwo = {
    ["firstLevel"] = {
        ["a"] = "something",
        ["b"] = "something",
        ["c"] = "something",
        ["subLevel"] = {
            ["d"] = "something",
        }
    }

Answer 1

尝试下面的代码：

function diff(a,b,s)
    for k,v in pairs(a) do
        if b[k]==nil then return s.."."..k end
        if type(v)=="table" then
            local w=diff(v,b[k],k)
            if w~=nil then return s.."."..w end
        end
    end
end

print(diff(tblOne,tblTwo,"TOP"))