Title: Mastering Modern React: Building Interactive UIs with Hooks and Context API

Introduction

Welcome to our comprehensive guide on mastering modern React! In this blog post, we’ll delve into the intricacies of building interactive user interfaces (UIs) using React Hooks and the Context API. Since we’re focusing on the functional aspects of React, we’ll avoid any CSS styling to keep the focus on the code.

Prerequisites

Before diving into Hooks and Context API, it’s essential to have a basic understanding of React, JavaScript ES6 features, and the latest version of React (currently React 17 as of this writing). If you’re new to React, we recommend going through the official React documentation or taking an online course to familiarize yourself with the basics.

React Hooks

Hooks were introduced in React 16.8 to allow function components to use state and other React features without converting them to class components. Some popular Hooks include `useState`, `useEffect`, and `useContext`.

useState Hook

The `useState` Hook allows function components to have state. Here’s a simple example:

“`jsx
import React, { useState } from ‘react’;

function Counter() {
const [count, setCount] = useState(0);

return (

);
}
“`

In this example, `useState` initializes the `count` state with the value 0, and `setCount` is a function to update the state.

useEffect Hook

The `useEffect` Hook lets you perform side effects in function components. Side effects include fetching data, subscribing to events, and updating the DOM. Here’s an example of fetching data using the `useEffect` Hook:

“`jsx
import React, { useState, useEffect } from ‘react’;

function DataFetcher() {
const [data, setData] = useState(null);

useEffect(() => {
fetch(‘https://api.example.com/data’)
.then(response => response.json())
.then(data => setData(data));
}, []);

return data ?

:

Loading…

;
}
“`

In this example, `useEffect` is called after the component is mounted, and it fetches data from an API. The second argument to `useEffect` is an empty array, which means it will only run once when the component mounts.

Context API

The Context API allows you to create a global data-sharing mechanism without needing to use props to pass data through multiple levels of your component tree. Here’s an example of creating a simple Context:

“`jsx
import React, { createContext, useState } from ‘react’;

const ThemeContext = createContext();

function ThemeProvider({ children }) {
const [theme, setTheme] = useState(‘light’);

return (

{children}

);
}

function ThemeConsumer() {
return (

{({ theme, setTheme }) => (

)}

);
}

function App() {
return (



);
}
“`

In this example, `ThemeProvider` wraps the component tree and provides the `theme` state and `setTheme` function to its children via the Context API. The `ThemeConsumer` component accesses these values and allows users to toggle the theme.

Conclusion

Hooks and