What is componentWillUnmount?
What is componentWillUnmount? componentWillUnmount() componentWillUnmount() is invoked immediately before a component is unmounted and destroyed. Perform any necessary cleanup in this method, such as invalidating timers, canceling network requests, or cleaning up any subscriptions that were created in componentDidMount() .
What is child prop?
The React children prop is an important concept for creating reusable components because it allows components to be constructed together. However, a common issue with using React with Typescript is figuring out which data type to use with React children since Typescript is a strongly typed library.
What is getDerivedStateFromProps?
getDerivedStateFromProps(props, state) is a static method that is called just before render() method in both mounting and updating phase in React. It takes updated props and the current state as arguments. We have to return an object to update state or null to indicate that nothing has changed.
Why is getDerivedStateFromProps static?
getDerivedStateFromProps is a new API that has been introduced in order for it to be extensible when Async rendering as a feature is released. According to Dan Abramov in a tweet , This method is chosen to be static to help ensure purity which is important because it fires during interruptible phase.
