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function App() { const [count, setCount] = useState(1); useEffect(() => { const t = setTimeout(() => { console.log(count); }, [count * 1000]); return () => clearTimeout(t); }, [count]); return ( <button onClick={() => setCount(count + 1) } > {count} </button> ); } function App() { const [count, setCount] = useState(1); useEffect(() => { const t = setTimeout(() => { console.log(count); }, [count *
Here is what happens when you try to fetch data directly from the body of a functional component in React 👇 Why does this happen and what tools does React offer to solve this problem? Side effects If your React component affects anything outside of itself, it’s called a side effect. Side effects shouldn’t happen during component render. Therefore they do not belong to the body of a functional com
18 Oct 2021 A Visual Guide to React Rendering - Cheat SheetWhen does a React component re-render? What can cause re-renders, and how to prevent unnecessary renders? Here is a quick cheat sheet you can refer to whenever you find yourself asking these questions. This article serves as a table of contents for the Visual Guide to React Rendering series. Each section of the cheat sheet links to the cor
This is a 3rd chapter of "A Visual Guide to React Rendering". Check out previous chapters: It always re-renders and Props. A quick quiz: A Child component is wrapped with memo. When the user role is "Admin", we want to pass an option to the Child to show a sidebar. However, the Child re-renders even when we change the user name. How do we prevent that? Even if we set the value for showSidebar dire
Components A, B, and C don't have any props or state. Yet, they still re-render when the App renders. In normal rendering, React does not care whether "props changed" - it will render child components unconditionally just because the parent rendered! — Mark Erikson - A (Mostly) Complete Guide to React Rendering Behavior To illustrate this point further, let's add state to every component and track
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