T = {
}
T[10] = 99
T[1] = 65
T[5] = 58

function table.first(T)
    -- return pairs(T)(T) -- doesnt work properly, returns 10, 99
    for i = 1, table.maxn(T) do if(T[i]) then return i, T[i] end end
end
function table.last(T)
    return table.maxn(T), T[table.maxn(T)]
end

print(table.first(T))
print(table.last(T))