JAVASCRIPT
Debounce User Input with useDebounce Hook
Implement a custom React `useDebounce` hook to delay execution of functions, perfect for optimizing search inputs, window resizing, or other frequent events.
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);
// useEffect(() => {
// if (debouncedSearchTerm) {
// console.log('Searching for:', debouncedSearchTerm);
// // Perform API call or heavy computation here
// }
// }, [debouncedSearchTerm]);
// return (
// <input
// type="text"
// placeholder="Search..."
// value={searchTerm}
// onChange={(e) => setSearchTerm(e.target.value)}
// />
// );
// }
How it works: The `useDebounce` hook delays updating a value until a specified `delay` has passed without any further changes. This is crucial for performance optimization, preventing excessive re-renders or API calls when dealing with rapidly changing inputs like search boxes, where you only want to act once the user has stopped typing. It uses `setTimeout` to defer the state update and `clearTimeout` in its cleanup function to reset the timer if the value changes again before the delay expires.