A visual guide on React component useEffect lifecycle. How components mount and re-render in React and their relation with the useEffect hook is one of the most important concepts in React. To summarize, 1. When first-time components are inserted in the DOM, they're referred to as "mounted," then updated via rendering, and later "unmounted." 2. While mounting, a component initializes. 3. In the render stage, a virtual DOM gets created and compared, and in the commit stage, it gets painted to the browser. 4. Any effect gets executed during the commit. If the state changes, the component re-renders with vDOM creation during rendering, painting, and attaching to real DOM during the commit phase. Would you be interested in learning React/JavaScript with visuals and to-the-point explanations of how things work under the hood? I do a deep dive into foundational concepts & how things work under the hood. You can consider connecting with or following me, Ali Raza, to get along with the journey. Thanks. #react #javascript #frontend
Awesome visual guide!
This is gold. useEffect lifecycle is one of those concepts that seems simple until you're debugging weird re-render issues. Understanding the 'why' matters Ali Raza
One important point is that unnecessary use of useEffect can cause additional re-renders.
Very Helpful post 👍
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Very nice representation. I found a couple of points that can be slightly misleading at first: "and in the commit stage, it gets painted to the browser." - Commit phase updates the DOM, and then the browser paints. Also, effects timing is also interesting. - useLayoutEffect runs during the commit phase (after DOM mutations, before paint) - useEffect runs after paint Adding this explicitly so that it can help others :)