What is useDebounce hook in React?

The useDebounce hook in React is a powerful tool that allows you to add debounce functionality to your components. Debouncing is a technique used to delay the execution of a function until a certain amount of time has passed since the last invocation. This can be particularly useful when dealing with input fields or any situation where you want to limit the frequency of function calls.

To implement the useDebounce hook in your React component, you can follow these steps:

1. Import the necessary dependencies:

import { useState, useEffect } from 'react';        

2. Define the useDebounce hook:

function useDebounce(value, delay) 
? const [debouncedValue, setDebouncedValue] = useState(value);
{
    useEffect(() => {
? ? const handler = setTimeout(() => {
? ? ? setDebouncedValue(value);
? ? }, delay);


? ? return () => {
? ? ? clearTimeout(handler);
? ? };
? }, [value, delay]);

? return debouncedValue;
}        

3. Usage within a component:

function MyComponent() 
? const [inputValue, setInputValue] = useState('');
? const debouncedValue = useDebounce(inputValue, 500);
{
? useEffect(() => {
? ? // Perform any action using the debounced value
? ? // This will be triggered only after the specified delay (500ms in this example)
? ? console.log('Debounced value:', debouncedValue);
? }, [debouncedValue]);


? const handleChange = (event) => {
? ? setInputValue(event.target.value);
? };


? return (
? ? <input type="text" value={inputValue} onChange={handleChange} />
? );
}        

In the example above, the useDebounce hook takes two arguments: value (the input value) and delay (the debounce delay in milliseconds). It returns the debouncedValue, which is the updated value after the specified delay has passed since the last change.

By using the useDebounce hook in your component, you can ensure that expensive operations triggered by the input value (such as API calls or state updates) are delayed until the user pauses typing, improving performance and responsiveness.

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Purvak Pathak MBA MCP Michael Adetu Infostork Technolabs - Microsoft Partner