Vector

local Object = {
xPos = 0,
yPos = 0,
xVel = 0,
yVel = 0
}

function Object:new(xPos, yPos, xVel, yVel)
    local class = {xPos = xPos, yPos = yPos, xVel = xVel, yVel = yVel}
    setmetatable(class, self)
    self.__index = self
    return class
end

function Object:move()
    xPos = xPos + xVel
    yPos = yPos + yVel