reading-notes

React Context:

React Context is a feature in React that provides a way to share state and data across components without having to pass props manually through all the intermediate components. It’s especially useful when dealing with data that needs to be accessed by multiple components at different levels of the component tree. Context allows you to create a global data store that can be accessed and modified by components that are part of the same context.

Use of Context in Managing State and Data Sharing:

Context is particularly helpful in scenarios where:

Prop Drilling Avoidance: It eliminates the need to pass props through multiple levels of components just to share data between deeply nested components.

Global State: It enables the creation of a global state that can be accessed and modified by multiple components without relying on a centralized state management library like Redux.

useContext Hook:

The useContext hook is a React hook that allows functional components to access data from a context. It takes a context object as an argument and returns the current context value. This hook is especially useful in functional components because it allows them to consume context without using higher-order components or render props.

Example:

Let’s say you have a context that provides the user’s authentication status:

import React, { createContext, useContext } from 'react';

// Create a context
const AuthContext = createContext();

// Create a provider component
const AuthProvider = ({ children }) => {
  const user = { isAuthenticated: true }; // Example user data
  return <AuthContext.Provider value={user}>{children}</AuthContext.Provider>;
};

// A functional component that consumes the context
const Profile = () => {
  const user = useContext(AuthContext);
  return <div>Welcome, {user.isAuthenticated ? 'User' : 'Guest'}!</div>;
};

// In the main App component
function App() {
  return (
    <AuthProvider>
      <Profile />
    </AuthProvider>
  );
}

Next.js:

Next.js is a popular React framework that adds server-side rendering (SSR), static site generation (SSG), and other performance optimizations to React applications. It simplifies the process of building fast, scalable, and SEO-friendly web applications.

Example from Next.js Vercel Examples:

One of the Next.js examples is the “E-commerce” example, which demonstrates how to build an e-commerce website with features like server-side rendering, dynamic routing, and data fetching. This example showcases how to create a scalable product listing page and product detail pages.