Web Reference: For the initial render, React will use the appendChild() DOM API to put all the DOM nodes it has created on screen. For re-renders, React will apply the minimal necessary operations (calculated while rendering!) to make the DOM match the latest rendering output. Feb 8, 2022 · The guide explains what re-renders are, what a necessary and unnecessary re-render is, what can trigger a React component re-render. Also includes most important patterns that can help prevent re-renders and a few anti-patterns that lead to unnecessary re-renders and poor performance as a result. Aug 8, 2025 · In ReactJS re-rendering occurs when React needs to update the app with new data or when a component’s state or props change. React compares the updated component with the previous one and updates only the parts that need changing to keep everything in sync.
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