Code snippet 14 - For multiplayer space invaders article

server.js

function startGameDataTicker() {
  let tickInterval = setInterval(() => {
    if (!gameTickerOn) {
      clearInterval(tickInterval);
    } else {
      bulletOrBlank = "";
      bulletTimer += GAME_TICKER_MS;
      if (bulletTimer >= GAME_TICKER_MS * 5) {
        bulletTimer = 0;
        bulletOrBlank = {
          y: SHIP_PLATFORM,
          id:
            "bulletId-" + Math.floor((Math.random() * 2000 + 50) * 1000) / 1000,
        };
      }
      if (shipBody) {
        copyOfShipBody = shipBody;
      }
      gameRoom.publish("game-state", {
        players: players,
        playerCount: totalPlayers,
        shipBody: copyOfShipBody.position,
        bulletOrBlank: bulletOrBlank,
        gameOn: gameOn,
        killerBullet: killerBulletId,
      });
    }
  }, GAME_TICKER_MS);
}