lua - 从 Lua 中的表中获取所有重复项

Question

我需要一点帮助 假设我有一个包含数字的表格。

tbl = {'item1' = 6, 'item2' = 1, 'item3' = 6, 'item4' = 3, 'item5' = 2, 'item5' = 3}

我想把所有重复的数字放在同一个表中(带有键和值)，如下所示:

repeated = {'item1' = 6, 'item3' = 6, 'item4' = 3, 'item5' = 3}

并用“不重复”的数字创建一个新的:

notrepeated = {'item2' = 1, 'item5' = 2}

有人可以帮忙吗？非常感谢。

Answer 1

-- Count the items for each number
local itemsByNum = {}
for item, num in pairs(tbl) do
    itemsByNum[num] = (itemsByNum[num] or 0) + 1
end
-- Now move objects to the respective tables
local rep, noRep = {}, {} -- can't use "repeat" as that's a Lua keyword
for item, num in pairs(tbl) do
    if itemsByNum[num] > 1 then -- repeated at least once
        rep[item] = num
    else -- unique number
        norep[item] = num
    end
end