Câu hỏi phỏng vấn Reactjs
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What is the order of useInsertionEffect , useEffect...

Câu trả lời

In React, the order in which hooks are executed during component generation is crucial for understanding how different effects are applied and managed within the component lifecycle. The specific hooks in question—useInsertionEffect, useEffect, and useLayoutEffect—each have distinct roles and execution timings.

  1. useLayoutEffect: This hook runs synchronously after all DOM mutations but just before the browser paints. It is used for effects that need to be executed right after DOM updates but before the screen is updated, such as measurements or adjustments to the DOM that need to be reflected immediately to avoid visual inconsistencies[2][3].

  2. useEffect: This hook is executed after the paint phase of the browser's rendering process, making it asynchronous relative to screen updates. It is suitable for most effects that do not require immediate synchronization with DOM state, such as data fetching, subscriptions, or manually manipulating the DOM after the component has been updated and displayed[3][5].

  3. useInsertionEffect: This hook is specifically designed for CSS-in-JS libraries and runs synchronously before all other layout effects. It allows styles to be inject...

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