React Tutorial #23 | React Hooks | useEffect | Beginner to Advance Series
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React useEffect Hook
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Phases : Mounting, Updating, Unmounting
constructor(props): This is the first lifecycle method called when a component is created.
static getDerivedStateFromProps(props, state): This static method is invoked just before rendering, both on the initial mount and on subsequent updates.
render(): The render() method is the most crucial lifecycle method and is required in every component. It is responsible for rendering the component's HTML markup and returning the React elements that make up the component's UI.
componentDidMount(): This method is called immediately after the component is mounted (i.e., inserted into the DOM). It is commonly used to perform actions that require interactions with the browser or external APIs, such as fetching data from a server.
shouldComponentUpdate(nextProps, nextState): This method is called before rendering when new props or states are received. It allows you to optimize performance by controlling whether the component should re-render or not. By default, React re-renders a component whenever its props or state change.
componentDidUpdate(prevProps, prevState): This method is invoked immediately after the component’s updates are reflected in the DOM. It is useful for performing actions after a component’s state or props have changed.
componentWillUnmount(): This method is called just before the component is unmounted and removed from the DOM.
Error handling phase is where we catch all the errors that occur in our application
Optional:
static getDerivedStateFromError()
static getDerivedStateFromError() is called when a component encounters an error. This method enables us to handle errors in the application.
componentDidCatch()
componentDidCatch() method works similar to static getDerivedStateFromError() method. It is called after an error in any child component occurs.
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