ReactJS
React 18+ New Hooks: How They Improve Your Apps
1. useId()
Purpose:
Give unique IDs to accessibility keys or attributes which would be identical in client and server (SSR).
const MyComponent = () => { const id = useId(); return ( <div> <label htmlFor={id}>Username:</label> <input id={id} type="text" /> </div> );};
Why Use It?
Resolves server side and client side control ID conflicts.
2. useSyncExternalStore()
Purpose:
New hook for subscribing to external stores in a way that is compatible with concurrent rendering.
import { useSyncExternalStore } from 'react';const subscribe = (callback) => { window.addEventListener('resize', callback); return () => window.removeEventListener('resize', callback);};const getSnapshot = () => window.innerWidth;function WindowWidth() { const width = useSyncExternalStore(subscribe, getSnapshot); return <div>Window width: {width}</div>;}
Why Use It?
Guarantees consistent reads from the external stores with multi-threaded rendering.
3. useInsertionEffect()
Purpose:
Hook injecting styles in advance prior to DOM mutation and the best in conjunction with CSS in JS libraries.
import { useInsertionEffect } from 'react';const MyComponent = () => { useInsertionEffect(() => { const style = document.createElement('style'); style.textContent = '.my-class { color: red; }'; document.head.appendChild(style); return () => document.head.removeChild(style); }, []); return <div className="my-class">Styled Text</div>;};
Why Use It?
Prevents style flicker during hydrating or re-rendering.
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