Master React in 5 Days: Become a React Expert in Under a Week

Do you dream of learning React without spending months in endless tutorials? Then this book is for you! In just five days, you will acquire the fundamental skills to start developing exceptional applications using this revolutionary technology. Whether you prefer to follow the book independently or alongside other online resources, it will provide you with a solid foundation to harness the full potential of React. Immerse yourself in an accelerated learning method that will allow you to make giant strides. Chapters are carefully designed to teach you the essential concepts of React, such as components, props, state, events, lifecycle, and hooks, without wasting time on complex explanations. Thanks to a clear and accessible writing style, you'll be able to dive into the intricacies of React from the first page. Code examples are accompanied by detailed explanations, enabling you to quickly grasp the subtleties of this technology. You don't need to be an expert in programming; the book is suitable for all levels, from beginners to more experienced developers looking to get up and running with React. You'll create React applications, reinforcing your understanding and consolidating your skills. You will be amazed at how quickly you progress with this hands-on approach that includes practical exercises to apply what you learn immediately. Don't wait any longer and dive into this exciting adventure right now. Master React in 5 Days will open the doors to a world of endless possibilities in web development. What You'll Learn Create React components Study JavaScript XML (JSX) syntax and handling events Understand React hooks Manage lists and states Who This Book Is For Programmers and web developer students with knowledge of JavaScript Table of Contents About the Author About the Technical Reviewer Acknowledgments Introduction Chapter 1: Day 1: Mastering Component Writing with React Why Use React React Virtual DOM Step 1: Creating the Virtual DOM Step 2: Reconciliation Process Decomposing an Application into Components Creating a First React Application Analyzing the Main Files of the React Application Step 1: Contents of the index.js File Step 2: Contents of the index.html File Step 3: Contents of the App.js File JSX Syntax in React Creating a First React Component Step 1: Install React DevTools Step 2: Incrementing the Counter with setInterval( ) Step 3: Using the useState( ) Method in a Component Step 4: Using the useEffect( ) Method in a Component Step 5: Using Attributes in Components Conclusion Chapter 2: Day 2: Mastering JSX Code Writing in a React Component Using the React.Fragment Component Step 1: Using the Tag Step 2: Using the Tag Step 3: Using the Tag Inserting JavaScript Code into JSX Writing a Condition in JSX Step 1: Using an Immediately Invoked JavaScript Function to Write the Conditional Test Step 2: Using the JavaScript Ternary Operator to Write the Conditional Test Writing a Loop in JSX Step 1: Writing the JSX Loop Using an Immediately Invoked Function Step 2: Using the “key” Attribute in JSX Elements Displayed by a Loop Step 3: Important Rule About the Value of the “key” Attribute in List Elements Step 4: Writing the JSX Loop Using the map() Method of the JavaScript Array Class Step 5: Using the map() Method to Display Large Lists of Elements Using Styles in JSX Conclusion Chapter 3: Day 3: Mastering Event Handling in a React Component Handling Click Events on a Button Step 1: Capturing an Event in a React Component Step 2: Incrementing a Counter by Clicking an Increment Button Step 3: Starting a Periodic Counter by Clicking a Start Button Step 4: Automatically Start the Counter the First Time Managing the Content of an Input Field Step 1: Allow Only Digits During Input Step 2: Give Focus to the Input Field upon Component Rendering Step 3: Display Multiple Counters and Show Their Real-Time Sum Step 4: Give Focus to the First Displayed Counter Conclusion Chapter 4: Day 4: Mastering React Hooks Definition of a Hook Main Rule About Hooks Using the useState() Hook Step 1: Writing the useState() Method Step 2: Using the Latest Value of the Reactive Variable Step 3: Avoiding Infinite Loops When Updating Reactive Variables Using the useContext() Hook Step 1: Presenting the Problem to Solve Step 2: Displaying the Sum of Counters Without Using the useContext() Hook Step 3: Displaying the Sum of Counters Using the useContext() Hook Step 4: Using the createContext() Method in the Parent Component Step 5: Using the useContext() Method in Child Components Step 6: When to Use the useContext() Hook? Using the useRef() Hook Using the useEffect() Hook Using the useReducer() Hook Step 1: Counter Component Using the useState() Hook Step 2: Counter Component Using the useReducer() Hook Step 3: Using the “state” Parameter as an Object Step 4: Using the “action” Parameter as an Object Other Hooks Creating Your Own Custom Hook Step 1: Creating a Hook to Limit Counter Value Step 2: Creating a Hook to Force Component Update Step 3: Creating a Hook to Retrieve the Previous Value of a Reactive Variable Step 4: Creating a Hook to Fetch Data from a Server Step 5: Creating a Hook for Data Formatting Step 6: Creating a Hook That Filters the Displayed Data Conclusion Untitled Chapter 5: Day 5: Practical Application—Managing a Task List with React Application Screens Creating the Application with create-react-app Breaking Down the Application into Components Adding an Item to the List Removing an Item from the List Modifying an Item in the List Step 1: Modifying the Item Step 2: Validation of the Modification Step 3: Assigning a Unique Value for the “key” Attribute Step 4: Obtaining Focus Directly on the Input Field Conclusion Chapter 6: JavaScript Reminders Using the “let” and “var” Keywords in JavaScript Using the “const” Keyword in JavaScript Manipulating Objects in JavaScript Step 1: Structuring an Object Step 2: Object Destructuring Step 3: Passing Objects as Function Parameters Step 4: Using the “...” Notation with Objects Manipulating Arrays in JavaScript Step 1: Structuring an Array Step 2: Array Destructuring Step 3: Using the “...” Notation with Arrays Using Import and Export of Modules in JavaScript Step 1: Using Modules in HTML Files Step 2: Using the “import” Statement Step 3: Using the “export” Statement Step 4: Using the “export default” Statement Step 5: Difference Between “export” and “export default” Statements Using Arrow Functions in JavaScript Step 1: Using Arrow Function Syntax Step 2: Understanding the Value of “this” in Arrow Functions Using the map( ) and filter( ) Methods of the JavaScript Array Class Step 1: Using the map( ) Method Step 2: Using the filter( ) Method Step 3: Using the map( ) and filter( ) Methods in React Using Promise Objects in JavaScript Step 1: Promise Object Definition Step 2: Without Using Promise Objects Step 3: Using Promise Objects Using “async” and “await” Statements in JavaScript Creating an Asynchronous Function That Utilizes JavaScript’s “await” Statement Step 1: Using “await” with a Function That Returns a Promise Object Step 2: Using “await” with a Function Declared with “async” Conclusion of the Book Index df-Capture.PNG