【入门夯实】Lua聚合分组：沙巴克守城名单按职业归堆

local function byJob(list)
    local war = {}
    for i = 1, #list do
        if list[i].job == "战士" then war[#war + 1] = list[i] end
    end
    -- 法师、道士再各扫一遍：3次全表扫描
    return war
end

local function byJob(actor, list)
    local buckets = {}
    for i = 1, #list do
        local job = list[i].job
        buckets[job] = buckets[job] or {}
        local b = buckets[job]
        b[#b + 1] = list[i]          -- 一遍遍历，按键归堆
    end
    sendmsg(actor, 1, "沙巴克守城分桶 " .. #buckets .. " 类")
    return buckets
end