ReactJS - The Beginner Masterclass [NEW]

Compare the old server-rendered web model with the new single-page application approach, emphasizing minimal initial load, asynchronous data fetching, and dynamic DOM updates.

React, a library, solves the data and state synchronization challenge by managing state and UI updates, letting developers focus on data and interface instead of vanilla JavaScript and DOM manipulation.

Explore React, the popular open source JavaScript library for building user interfaces, which uses a declarative, component-based approach to render only what changes for efficiency.

Paolo invites feedback and questions for the ReactJS beginner course, encouraging reviews and active discussion in the course discussion board to help fellow students learn.

Set up the development environment by installing Visual Studio Code, Google Chrome, and Node.js; follow platform-specific install steps and verify node -v to begin building React apps.

Install and configure VS Code extensions for react development, including prettier as the default formatter and format on save; install es7 react/redux snippets and apply the Oh Lucy theme.

Learn to create and run a React project with vite, including selecting react as the framework, installing dependencies, and starting the dev server at localhost:5173.

Explore the react project structure by walking through vit setup, vs code integration, and key files like package.json, index.html, app jsx, and assets, while observing auto reload and terminal workflows.

Master the basics of React building blocks by creating and composing components, understanding JSX, props, state, and hooks, and rendering a simple first component in App.jsx.

Explore how jsx enables writing html-like code inside javascript, compiled by babel into react elements, and how react uses a virtual dom and reconciliation to efficiently update the real dom.

Explore how Babbel compiles JSX into JavaScript in a live demo on Babbel js.io repl. Observe how JSX creates h1 with className greeting and a div, rendered as React elements.

Explore the main files of a React project, from the app component and JSX to the index.html root, while understanding className usage and the render flow.

You build a book component in ReactJS by returning a div with title, author, and description, and learn to interpolate variables in JSX using curly braces.

Learn how to refactor a book component to use props, elevating data to the parent and passing title, author, and description via the props object for reusable components.

Learn to pass props and render book details from a books array, pulling title, author, and description, and move beyond hard-coded single-item rendering toward array iteration manually.

Use the map method to loop through the books array and transform each book object (id, title, author, description) into JSX that renders all items.

Learn how the key prop helps React track list items for efficient rerendering, and implement unique keys in mapped lists using data ids rather than indices.

Learn how props pass data from a parent to a child in React, why they are immutable, and how one-way data flow ensures predictable, efficient UI updates.

Destructure props to extract fields like title, author, and description from the props object using curly braces, making code easier to read and access data directly.

Create a user profile card in React by building a reusable component that displays name, email, and bio, using props and a dedicated App.css class for styling.

Explore the fundamentals of React, including what it is, how it works, and its modern approach to web development, along with components and props.

Explore how React components link logic, state, props, and data to control appearance and interactivity while building small applications.

Reorganize your react project by creating a components folder and extracting book and user profile components. Export, import, and pass props such as email, name, and bio to render content.

Import a books data object from a separate data file and map its items to populate a book component with title, subtitle, authors, description, and image.

Demonstrate a read/unread toggle with a button in a book component using onClick and an arrow function, then explain why changing state without React state management fails to trigger re-renders.

Use the React useState hook to create a reactive boolean state, toggle it with its setter, and update a button label between unread and read based on state.

Explore how state drives React apps: trigger updates via event handlers, update state with useState, and rerender only the necessary UI, avoiding direct manipulation.

Create a new quotes app with a components folder, build a random quote component, and set up a button to display a random quote from an array using initial state.

Build a random quote generator in React by using useState, an on click handler, and a quotes array to select a random quote and render its content and author.

Learn how React state updates after clicking get quote, updating the quote from a random array and triggering a rerender to keep user interface and data in sync.

Explore styling React components with CSS and Bootstrap, navigate app and index CSS, tweak borders, padding, and colors, and prepare to install Bootstrap for responsive, modern UIs.

Install bootstrap with npm and import bootstrap in your React app and use bootstrap cards, containers, and buttons to style the RandomQuotes app while ensuring responsive design.

Learn to manage multiple states in a React component by adding a color state that changes the card background to a bootstrap color each time a quote is generated.

Lift state up to the parent component to share and centralize state across multiple components, reducing prop drilling and ensuring consistent data as your React app grows.

Lift state up to the app component in a random quote app, passing quote, color, and a change handler as props from parent to child to share state across components.

Lift the state up to a centralized counter in a React app by sharing one count between increment and decrement buttons, demonstrating props and onClick for unified state management.

Examine how React forms enable users to enter information into applications, and why this is a critical part of building React apps.

Create a simple React form by building a name form component, styling inputs with Bootstrap form-control and a primary submit button, and applying container and spacing classes.

Learn how to handle form submissions in React with onSubmit and preventDefault, and log a message on submit without page reload.

Master controlled elements in a React form by wiring on submit, on change, and useState to sync input value with state and read the event target value.

Build a controlled React form by managing input state with useState. Submit to add names to a list rendered with map, using spread to preserve entries and clear the input.

Learn to build a multi-input form in React by expanding from a single input to name, age, and profession, managing form data as an object, and rendering profiles.

Master a multi-form pattern in React by wiring handleChange, updating form data with setFormData, and syncing name, age, and profession fields via event.target destructuring and the spread operator.

Validate form data to ensure non-empty name, age, and profession, then append to profiles with the spread operator, reset the form, and render each profile as a card showing name, age, and profession.

Build a functional grocery list app in React that adds, deletes, and marks items as purchased, with live item counts reflecting progress, reinforcing hands-on state management and learning-by-doing.

Create a grocery list component in React, add a dummy groceries array with id and text, map items into a ul with keys, and render it in App.jsx.

Build reusable footer and nav components in a React app using Bootstrap, with a container, margin bottom, and hr line, and a footer featuring background-light, text-dark, text center, and padding.

Refine the grocery list ui with bootstrap cards and d-flex layout, map items by id, display item text, and render a rounded success circle using inline style.

Learn to build a grocery form component in React that adds items to a groceries list using onChange and onSubmit handlers, and includes a delete button.

Fix clear form issues by correcting handle on submit in props, pass the actual object, and lift state to the parent so items add reliably.

Add bootstrap icons to a React project by linking the bootstrap icons CDN in index.html, then replace delete text with a trash icon and explore hover effects.

Learn to toggle a grocery item's bought state by lifting state to the parent, then pass an onToggle function as a prop and wire the click handler to update item.id.

Implements item toggling by mapping grocery items, matching the clicked id, and updating the item's bot state with the spread operator; test results appear in the console.

Learn to use a ternary operator in ReactJS to toggle circle color and apply a strike-through to item text based on item.bought, including cursor styling and bootstrap classes.

Pass a handleRemoveItem prop from the parent app to the grocery list and wire an on click to remove items by id using the filter method to update groceries items.

Show dynamic footer stats in a ReactJS app by computing total items from the grocery list and bought items, then pass these counts as props to the footer.

Learn react forms, including multi-input, on-submit handling, and controlled elements, with state lifted to a parent component for full control, as you build a grocery list web app.

Discover how to fetch data from back-end APIs in React using the useEffect hook, and master the component life cycle from mounting to unmounting to build dynamic applications.

Learn how to fetch data from a JSON placeholder API in React, why fetching in the component body causes infinite renders, and how the useEffect approach fixes it.

Learn how to fetch data from an API using the useEffect hook in React, running once after the render with an empty dependency array to avoid loops and boost performance.

Lift state to a parent component and pass data via props, then add a loading state with useState to control conditional rendering while fetching API data.

Explore how the use effect dependency array controls when effects run, from an empty array for one-time execution to passing values to trigger re-runs, with an adjustable timer example.

Start a brand-new React project to fetch data from the Google Books API, set up bootstrap and icons, run the dev server, and initialize git with commits and push.

Create and integrate a bootstrap-enabled navigation bar in a React project by adding a NavBar component, organizing a components folder, importing it into App, and refining CSS for proper alignment.

Create a footer component in React using JSX, style a div with class name for a light background and centered text, and export and import it to render at bottom.

learn to fetch books from the google books api using react hooks, extract items and volume information to display titles, authors, and descriptions.

Set up a dynamic URL query to fetch books by user input, using a stateful query with useState and a dependency array, and enable a search bar for related results.

Create a self-contained search bar component in React, manage its search term state, and handle submit, wiring it through the navbar with an onSearch prop to query books.

Debug and verify that the search term state updates correctly, passes the query through the app, and renders API data for Java, Python, and JavaScript.

Explore building a responsive React book list by mapping books to a book card component, displaying images, titles, and authors using Bootstrap cards and props, with live search-driven updates.

Introduce a loading state around the fetch, toggle it true during fetch and false after, and display a Bootstrap loading indicator with a unique key prop for each list item.

Learn to clear a search form in a ReactJS app by updating the submission handler to reset the search term to an empty string, ensuring the field clears after submission.

Refactor the API client to fetch books into a services file, implement fetchBooks with try-catch and JSON parsing, and connect it to the app with search queries and loading state.

Create a custom hook useBooks to reuse non-visual logic, move fetch logic to an API client, and return books, loading, and setSearchTerm.

Learn to use an abort controller with fetch inside a useEffect to abort HTTP requests on component unmount, preventing memory leaks and enabling proper cleanup with a signal.

Build the book detail component and an interactive see more feature in React. Connect a book card button to a pop-up displaying the selected book via props and state.

Learn concise conditional rendering in React by using the logical and operator to display the selected book’s title and prepare a detail pop-up triggered by clicks.

Show book details in a bootstrap modal using React; manage selected book and on close to display title, authors, thumbnail, publish date, and description.

Destructure the book object and provide defaults for missing fields like title, authors, and thumbnail, using a placeholder image to keep the React app from breaking.

Build and deploy your React app to production by running npm run build to create a dist folder, then deploy with Vercel CLI and publish a production URL.

Connect your GitHub repository to Vercel and automate deployment; push changes to see updates instantly in your React app.

Build a bookshelf app with the Google Books API to search books, create modular React components and custom hooks, add error handling, and deploy to Vercel.