Code Explanation

Imports

• import './App.css': This imports the CSS file App.css to style the components in this file.
• import axios from "axios";: Imports Axios library for making HTTP requests.
• import { useEffect, useState } from "react";: Imports useEffect and useState hooks from the React library.

Constants

• const BASE_URL = "https://xxxxxxxxxxxxxxx.mockapi.io/v1/todo";: Defines the base URL for the API endpoint.

Component Function

• App: This is the functional component named App.

State

• const [data, setData] = useState(null);: Initializes a state variable data using the useState hook, which will store the fetched data from the API.

useEffect Hook

• Utilizes the useEffect hook to perform side effects in the component.
• Fetches data from the API when the component mounts.
• Uses an empty dependency array ([]) to ensure the effect runs only once.

Fetching Data

• Defines an asynchronous function fetchData to fetch data from the API using Axios.
• Sets the fetched data into the data state variable.

Clean-up Function

• Defines a clean-up function inside the useEffect hook to cancel any pending Axios requests.
• This function is called when the component unmounts or re-renders.
• Helps prevent memory leaks by canceling pending requests before new effects are run.

JSX Return

• Renders JSX elements:
  • Heading My Component to cancel useEffect.
  • Unordered list (<ul>) with three list items (<li>), each containing an anchor (<a>) tag with different links.
  • Displays the fetched data if available, using JSON.stringify.

Export

• export default App: Exports the App component as the default export from this file.