randomize an order of an array.

fisher-yates_shuffle.lua

#!/usr/bin/env lua

function shuffle(tab)

    -- allocation of the random array
    local random_tab = {}
    for i=1,#tab do
        table.insert(random_tab, nil)
    end

    for i=#tab,1 do
        random_tab[math.random(1,i)] = tab[i]
    end

    return random_tab
end