JAVASCRIPT
Efficient Debouncing for React Inputs with `useDebounce`
Learn to create a custom `useDebounce` React hook to delay state updates, optimizing performance for search inputs and preventing excessive function calls.
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;
}
// How to use it:
// function SearchBar() {
// const [searchTerm, setSearchTerm] = useState('');
// const debouncedSearchTerm = useDebounce(searchTerm, 500); // 500ms delay
// useEffect(() => {
// if (debouncedSearchTerm) {
// console.log('Fetching data for:', debouncedSearchTerm);
// // Perform API call or expensive operation 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 sets a `debouncedValue` state which only updates after the specified `delay` has passed since the `value` last changed. This is achieved using `setTimeout` and `clearTimeout` within a `useEffect` hook, preventing immediate re-execution of a function (like an API call) every time the input value changes, thus optimizing performance.