JAVASCRIPT
React useDebounce Hook for Input Search and Performance Optimization
Implement a custom `useDebounce` React hook to delay state updates, perfect for optimizing search inputs, preventing excessive API calls, and improving performance.
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:
/*
import React, { useState } from 'react';
import useDebounce from './useDebounce'; // Assuming useDebounce is in its own file
function SearchInput() {
const [searchTerm, setSearchTerm] = useState('');
const debouncedSearchTerm = useDebounce(searchTerm, 500); // 500ms delay
useEffect(() => {
if (debouncedSearchTerm) {
console.log("Fetching data 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 takes a `value` and a `delay`. It maintains a `debouncedValue` state, which is updated only after the `value` has not changed for the specified `delay` period. A `useEffect` hook sets a `setTimeout` to update `debouncedValue`. If the `value` changes again before the timeout completes, the previous timeout is cleared, and a new one is set. This ensures the `setDebouncedValue` action only occurs once the user has stopped typing for the duration of the `delay`.