Kursinnehåll

React Mastery

1. Fundamentals of React and Component-Based UI

What Is React and Why Use It?Comparing SPAs and MPAs in Web Development How React Works with the Virtual DOM Introducing JSX for Writing HTML in JavaScript Building Complex UI with JSX Rendering Elements in React Challenge: Render an Element in React Understanding React Components Passing Data with Props in React Challenge: Create Functional Components Conditional Rendering in React Challenge: Implement Conditional Rendering – Chat Notification Challenge: Implement Conditional Rendering – Bank Alert Rendering Collections of Data in React Challenge: Display Data Collections in React React Fundamentals Wrap-Up

2. Styling Techniques in React Applications

Introduction to Styling in React Using Inline Styles in React Applying Inline Styles in Practice Challenge: Use Inline Styles in a React Component Styling React Components with External CSS Applying External CSS in Practice Challenge: Apply External CSS to a React App Using CSS Modules for Scoped Styling in React Organizing File and Folder Structures for Styles Challenge: Use CSS Modules in React Styling Techniques in React Wrap-Up

3. React Hooks and Context for State Management

Introduction to React Hooks and Context Managing State with the useState Hook Challenge: Toggle Visibility with useState Working with References Using the useRef Hook Challenge: Build a Controlled Form Component Handling Side Effects with the useEffect Hook Challenge: Fetch and Display Data with useEffect Optimizing Performance with the useMemo Hook Challenge: Implement a Car List Filter with useMemo Sharing State Across Components with Context Using Context in a Real-World Scenario Challenge: Build a World of Astronomy App with Context React Hooks and Context Wrap-Up

4. Structuring Real-World React Projects

Setting Up Your React Development Environment Choosing a Code Editor for React Development Organizing the Project Folder Structure Working with the Terminal in React Development Starting and Running a React Project with Vite React Project Setup Wrap-Up

Building Complex UI with JSX

In the previous chapter, we explored the basics of JSX. Now, let's dive deeper and learn how to create more complex JSX elements.

The Rule of a Single Parent Element

One important rule when working with nested JSX is that it must return a single parent element. This parent element wraps all the other levels of nested elements. This rule ensures that React can properly render and manage the structure of your JSX. Here's a practical example to illustrate this rule:

Valid JSX:

<div>
  <h1>Welcome to My Website</h1>
  <p>Explore amazing content:</p>
  <ul>
    <li>Article 1</li>
    <li>Article 2</li>
    <li>Article 3</li>
  </ul>
</div>

Invalid JSX (Won't Transpile):

<h1>Welcome to My Website</h1>
<p>Explore amazing content:</p>
<ul>
  <li>Article 1</li>
  <li>Article 2</li>
  <li>Article 3</li>
</ul>

Note

When rendering multiple elements like this, we can wrap them all in parentheses () for clarity, but it's not strictly required. Also, remember that this concept applies when we return JSX elements in React components.

Example

const JSX = (
  <div>
    <h1>Welcome to My Website</h1>
    <p>Explore amazing content:</p>
    <ul>
      <li>Article 1</li>
      <li>Article 2</li>
      <li>Article 3</li>
    </ul>
  </div>
);

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