React Component Lifecycle Methods: A Practical Guide with Hook Equivalents

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React class components follow a defined lifecycle covering mounting, updating, unmounting, and error handling, with special methods available at each stage. Understanding these phases remains relevant today because many production codebases still use class components, and lifecycle concepts map directly to modern Hooks like useEffect and useLayoutEffect. A key distinction exists between the render phase, which should remain pure and free of side effects, and the commit phase, where side effects such as API calls and DOM manipulation are safe to perform. Error boundaries, which catch errors from child components, are still typically implemented as class components. The guide walks through each lifecycle method in order, from constructor and getDerivedStateFromProps during mounting to componentWillUnmount during teardown, and pairs each with its Hook equivalent.

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