LÖVE

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-- syntax to create a bullet:
mybullet = Bullet(sprite, position, spriteRadius, hitboxRadius, events)
-- the events table is an array of {time, func} items.
-- the func will execute when the bullet's lifetime exceeds time.
-- the bullet also has a backend "updatefuncs" table, which contains functions that are executed on every bullet update
-- you add functions to it by making an event at 0.
-- here's an example bullet:
Bullet(self.files.gfx.bullet, Vector(math.random(50, 450), math.random(50, 450)), 8, 4, {
  {0, function(self) -- executes on first bullet update
    self.updatefuncs.move = function(self, dt)
      self:modPosition(Vector(100, 100):rotate(self.angle) * dt) -- move in our direction for 100 pixels per second
    end
    self.updatefuncs.updateangle = function(self, dt)
      local add = math.pi * dt -- move half a turn a second
      if math.floor(self.lifetime) % 2 == 0 then -- if an odd second
        add = -add -- negate the angle to add
      end
      self.angle = self.angle + add -- change the direction
    end
    self.updatefuncs.outofbounds = function(self)
      if self:outOfBounds(550, 550) then -- 550x550 is the size of the game field
        self.remove = true -- the Game class removes the bullet later on
      end
    end
    self.color = Color(math.random(200, 255), math.random(200, 255), math.random(200, 255), 255) -- needs more fabulous
  end},
  {5, function(self) -- executes after five seconds of lifetime
    self.updatefuncs.move = function(self, dt) -- you can override the old updatefuncs!
      self:modPosition(Vector(200, 200):rotate(self.angle) * dt) -- move in our direction for 200 pixels per second
    end
    self.color = Color(math.random(200, 255), math.random(200, 255), math.random(200, 255), 255) -- why not?
  },
})