Using setInterval in React Component

Question

I was reading the tutorial on the official react website. In the example about life cycle methods, under the componentDidMount method, a timerID is set to the setInterval fu

Answer 1

In this react document it's written that

We will tear down the timer in the componentWillUnmount() lifecycle method

So, this.timerID will be used in componentWillUnmount() lifecycle method to stop timer.