what is useDispatch in React ?

The hook provided by the React-Redux library to set or write a value in the store is useDispatch.

useDispatch is a hook that allows you to dispatch actions to the Redux store from your React components.

Here's an example of how to use useDispatch:

import React from 'react';

import { useDispatch } from 'react-redux';

import { updateValue } from '../actions';

const MyComponent = () => {

  const dispatch = useDispatch();

  const handleClick = () => {

    dispatch(updateValue('new value'));

  }

  return (

    <div>

      <button onClick={handleClick}>Update Value</button>

    </div>

  );

}

In this example, useDispatch is used to get a reference to the dispatch function, which is used to send an action to the Redux store when the button is clicked. The updateValue action creator is used to create an action that will update the value in the store. When the action is dispatched using the dispatch function, the state in the store will be updated based on the action.