---@class array
array = {}

function array.clear(t)
    local count = #t
    for i = 1, count do
        table.remove(t)
    end
end

function array.length(t)
    return t and #t or 0
end

function array.contains(t, item)
    return array.indexOf(t, item) ~= nil
end

function array.indexOf(t, item)
    for k, v in ipairs(t) do
        if v == item then
            return k
        end
    end
    return nil
end

function array.random(t)
    math.randomseed(os.time())
    for i = 1, #t do
        local j = math.random(i)
        table[i], table[j] = table[j], table[i]
    end
end