Discussion on: Accessing React State right after setting it

[Truong Hoang Dung]

Don't forget to use shouldComponentUpdate, because you're gonna make an infinite recursion in your componentDidUpdate

[Sung M. Kim]

Thanks for the tip there Truong.

Would you share a case how an infinite recursion could occur?

[Truong Hoang Dung]

You can read it in the reactjs documentation, it says:

You may call setState() immediately in componentDidUpdate() but note that it must be wrapped in a condition like in the example above, or you’ll cause an infinite loop.

The example is

componentDidUpdate(prevProps) {
  // Typical usage (don't forget to compare props):
  if (this.props.userID !== prevProps.userID) {
    this.fetchData(this.props.userID);
  }
}

In my case, i update and re-render component whenever i receive new data from websocket.

[Sung M. Kim]

it must be wrapped in a condition

Ah without it, a component definitely state to update infinitely.

Thanks Truong.