willriker

  const refreshDelay = 1000 / FPS;

  while (true) { 
    yield take(START_GAME_PLAY);

    while (true) { 
      const {
        gameState: {
          speed,
          isPlaying,
          gameTime,
        },
      } = getState();

      if (!isPlaying) {
        // game play has stopped
        break;
      }

      const timeDelta = refreshDelay * speed;
      yield put(setGameTime(gameTime + timeDelta));

      // sleep
      yield call(delay, refreshDelay);
    }
  }
}