如何访问lua表中的value？

local myTable = {
    name = "Alice",
    age = 30,
    city = "New York"
}

-- 使用点符号
print(myTable.name)  -- 输出: Alice

-- 使用方括号
print(myTable["age"])  -- 输出: 30

print(myTable.gender)  -- 输出: nil

if myTable.gender ~= nil then
    print(myTable.gender)
else
    print("Gender is not specified")
end

local invalidKey = function() end
myTable[invalidKey] = "value"  -- 这将导致错误

local validKey = "validKey"
myTable[validKey] = "value"  -- 正确

local myTable = {
    name = "Alice",
    age = 30,
    city = "New York"
}

-- 访问表中的值
print("Name: " .. myTable.name)
print("Age: " .. myTable["age"])
print("City: " .. myTable.city)

-- 检查键是否存在
if myTable.gender ~= nil then
    print("Gender: " .. myTable.gender)
else
    print("Gender is not specified")
end