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Explain component lifecycle methods and hooks.

Expert JavaScript
Quick Answer React: mounting (constructor รขโ€ โ€™ render รขโ€ โ€™ componentDidMount / useEffect[]), updating (render รขโ€ โ€™ componentDidUpdate / useEffect with deps), unmounting (componentWillUnmount / useEffect cleanup). Vue: created, mounted, updated, unmounted. Angular: ngOnInit, ngOnChanges, ngAfterViewInit, ngOnDestroy. Lifecycle hooks are where you initialize, clean up, and react to changes.

Answer

React uses lifecycle methods (componentDidMount, componentDidUpdate) and useEffect hook. Angular uses lifecycle hooks like ngOnInit, ngOnChanges, ngOnDestroy. They manage initialization, subscriptions, cleanup, and reactive updates.

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