local fmt = require "fmt"

local function mode(a)
    local t = a:countvalues()
    local max = t:values():max()
    local res = {}
    for k, v in t do
        if v == max then res:insert(k) end
    end
    return res
end

local tests = {
    {1, 2, 5, -5, -9.5, 3.14159},
    { 1, "blue", 2, 7.5, 5, "green", "red", 5, 2, "blue", "white" },
    {1, 2, 3, 1, 2, 4, 2, 5, 2, 3, 3, 1, 3, 6},
    {.2, .7, .1, .8, .2},
    {"two", 7, 1, 8, "two", 8},
    "Hello there world":split(""),
    {}
}

for tests as test do fmt.lprint(mode(test)) end