英文:
Lua: moving table values into a sub table
问题
我有一个类似的表格
{
a = 1,
b = 2,
c = 3,
}
我想将这个表格移动到现有表格中的一个子表格内，同时保留其所有的值，使其看起来像这样：
{
letters = {
a = 1,
b = 2,
c = 3,
},
otherStuff = {}
}
有没有简单的方法可以实现这个？谢谢！
英文:
I have a table that looks like
{
a = 1,
b = 2,
c = 3,
}
And I'd like to move this table, while retaining all its values, into a sub-table within the existing table, so it looks like:
{
letters = {
a = 1,
b = 2,
c = 3,
},
otherStuff = {}
}
Is there any easy way to do this?
Thanks!
答案1
得分: 3
只需使用 pairs 遍历键值对，将它们移动到一个新的表中，并从原始表中删除它们，然后设置 letters 和 otherStuff 子表：
local t = {a = 1, b = 2, c = 3}
-- 重组表 t
local letters = {}
for k, v in pairs(t) do
letters[k] = v -- 复制到 letters 表
t[k] = nil -- 删除条目 - 在 Lua 中进行迭代期间执行此操作是可以的
end
-- 现在更新原始表
t.letters = letters
t.otherStuff = {}
话虽如此，为什么要更新原始表，而不是简单地构建一个新表 {letters = t, otherStuff = {}}？这似乎是一个 X-Y 问题。
英文:
Simply move over the key-value pairs using pairs, move them to a new table, deleting them from the original table, then set the letters and otherStuff subtable:
local t = {a = 1, b = 2, c = 3}
-- Restructure t
local letters = {}
for k, v in pairs(t) do
letters[k] = v -- copy to letters table
t[k] = nil -- delete entry - doing this during iteration is fine in Lua
end
-- now update original table
t.letters = letters
t.otherStuff = {}
that said, why do you have to update the original table, rather than simply constructing a new table {letters = t, otherStuff = {}}? This seems to be an X-Y-problem.
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