向 Lua 中的现有表添加列

Question

在 Lua 中，如何在如下表中插入新列？

table t = {
{name = "John", age = 19, sex = "M"},
{name = "Susan", age = 20, sex = "F"},
{name = "Paul", age = 18, sex = "M"}
}

我想在名称前放一列id，所以表格可能是这样的：

table t = {
{id = 1, name = "John", age = 19, sex = "M"},
{id = 2, name = "Susan", age = 20, sex = "F"},
{id = 3, name = "Paul", age = 18, sex = "M"}
}

PS：此表的数据来自如下文件：

entry {name = "John", age = 19, sex = "M"}
entry {name = "Susan", age = 20, sex = "F"}
entry {name = "Paul", age = 18, sex = "M"}

我正在使用此代码将此数据插入到表中：

data = {}
text = file:read()
do
    function entry(entrydata)
        table.insert(data, entrydata)
    end
    thunk = load(text, nil, nil, {entry = entry})
    thunk()
end

Answer 1

for i,v in ipairs(t) do
    v.id=i
end

或者，您可以在加载期间设置值：

data = {}
text = file:read()
do
    local index=1
    function entry(entrydata)
        entrydata.id=index
        index=index+1
        table.insert(data, entrydata)
    end
    thunk = load(text, nil, nil, {entry = entry})
    thunk()
end