JAVASCRIPT
Debounce Any Value with `useDebounce` React Hook
Implement a generic `useDebounce` hook in React to delay updates of any value until a specified time has passed, optimizing performance for search inputs, resizing, and more.
import { useState, useEffect } from 'react';
function useDebounce(value, delay) {
const [debouncedValue, setDebouncedValue] = useState(value);
useEffect(() => {
const handler = setTimeout(() => {
setDebouncedValue(value);
}, delay);
return () => {
clearTimeout(handler);
};
}, [value, delay]);
return debouncedValue;
}
// Example Usage:
// function SearchInput() {
// const [searchTerm, setSearchTerm] = useState('');
// const debouncedSearchTerm = useDebounce(searchTerm, 500);
//
// // Effect for API call or expensive operation
// useEffect(() => {
// if (debouncedSearchTerm) {
// console.log('Searching for:', debouncedSearchTerm);
// // Perform API call here
// }
// }, [debouncedSearchTerm]);
//
// return (
// <input
// type="text"
// placeholder="Search..."
// value={searchTerm}
// onChange={(e) => setSearchTerm(e.target.value)}
// />
// );
// }
How it works: The `useDebounce` hook takes a `value` and a `delay`. It maintains a `debouncedValue` state. A `useEffect` sets a timeout to update `debouncedValue` with the latest `value` after the specified `delay`. If the `value` changes again before the timeout completes, the previous timeout is cleared, and a new one is set, effectively delaying the update until the `value` stops changing for the duration of the `delay`.