proto Vector
    function __init(self)
        self.vector = []
        self.x = 0
    end

    function __index(self, key)
        return self.vector[key]
    end

    function push(self, val)
        self.vector[self.x++] = val
    end 

    function pop(self)
        return self.vector[--self.x]
    end
end

var vector = Vector()

for (var i = 0; i < 4; i++) do
    vector:push(i)
end

for (var i = 0; i < 4; i++) do
    print(vector:pop() .. " : " .. vector[i])
end