Mastering React JS: A Hands-On Course for Web Developers

Learn how JSX lets you create React elements with HTML-like syntax in JavaScript, simplifying code versus vanilla JavaScript, and see div, h1, and image elements with their attributes.

Learn how JSX is not HTML, apply HTML-like structure to JSX, set properties and nest elements, and use className instead of class, with browser hints guiding corrections.

Master how to render dynamic content in JSX by injecting JavaScript expressions with curly braces, including name and age variables in React.

Wrap large blocks of code in parentheses to keep return statements clean and readable. Render variables inside jsx with curly braces to show dynamic content.

Learn how JSX requires every element to be closed, unlike HTML, and use self-closing syntax like <tag /> to render correctly.

Break React code into helper functions that return JSX and render them inside JSX using curly braces. Explore function declarations, expressions, and arrow functions, including inner functions accessing outer variables.

Master the rule of returning one top-level element in react, learn when to wrap with a div versus using a fragment, and avoid extra markup that disrupts styling and layout.

Plan frequent deployments by setting a host provider and testing regularly. Create production builds with npm run build, then deploy and verify on the host.

Push changes to a remote git repository to trigger an automated pipeline that runs npm install and npm run build, deploying to the host provider for frequent testing.

Learn how to deploy a React app via a pipeline by connecting a GitHub repository to a hosting provider like Vercel, test builds, and push changes for automatic deployments.

Review core javascript concepts: variables, functions, operators, and classes, using vanilla javascript to prepare you for hands-on react js lectures.

Declare variables in JavaScript using var, let, and const, focusing on block scope and reassignment rules. Cover for loops, console.log usage, and basic data types.

Explore template literals in JavaScript to build dynamic messages with backticks and variable interpolation. Replace concatenation with multi-line strings for cleaner console output and page display.

Explore how functions organize and reuse code in React JS, covering declarations, expressions, arrow functions, and the distinction between parameters and arguments.

Learn function expressions as anonymous functions assigned to variables, compare them with function declarations, and understand how hoisting and memory allocation affect when you can call them.

Explore arrow functions and how they compare to function expressions, covering parameter rules, the arrow syntax, and when to use braces or implicit returns.

Explore how return statements control function flow and how the early return pattern simplifies complex validations like user authorization.

Explore how closures and nested functions encapsulate variables, enabling inner functions to access the outer block scope and create multipliers in JavaScript and React.

Master JavaScript operators, covering binary and unary operators, operands, and common gotchas, with examples using variables to sum numbers and the assignment operator defined by the equal sign.

Explore how JavaScript comparison operators work, including equal, not equal, greater than, and less than. See triple equals for value and type matching with numbers and strings.

Master JavaScript arithmetic operators, from plus, minus, asterisk, and slash to unary assignments (+=, -=, *=, /=), and compare prefix versus postfix increment and decrement with clear examples.

Learn how logic operators and, or, and not shape boolean expressions in JavaScript, with practical name-validation examples and concise shorthand patterns.

Explore how the logical or operator uses short-circuit evaluation to supply a fallback value, returning the first defined value or a default like unknown user for a username.

Learn to use the conditional (ternary) operator in React JS to assign a value based on a condition, producing minor or adult, with single-line and multi-line formatting for readability.

Explore arrays in JavaScript by replacing multiple variables with a single fruits array, using square brackets, zero-based indexing, and length to access elements and loop through them.

Push adds new items to the end of an array and returns the updated length, enabling dynamic content like orange added to apple, banana, and cherry.

Learn to iterate arrays with for each, using a callback to process each fruit, and compare with traditional for loops; master function expressions, anonymous and arrow functions for clean code.

Explore how the map method returns an array by applying a callback to each element, unlike for each that returns undefined, shown with fruits and uppercase transformations using arrow functions.

Explore the array includes method to test for a value's presence, with case sensitivity considerations. See when includes works with primitive data and when to use filter for objects.

Learn how array.filter creates a new array by including elements based on a condition, contrasting with map, with examples using strings and objects (age, id) and toLowerCase.

Discover how JavaScript objects organize data with properties and methods, which are functions. Use a car example to show properties like name and color and methods like start or stop.

Explore how a class serves as a blueprint for objects, using a constructor to set properties and methods, and leveraging prototype and inheritance for shared behavior.

Explore how class inheritance uses a base person class extended by student and professor, using super and overrides to share the get full name logic while adding grade and salary.

Learn destructuring assignment for arrays and objects, extracting values with left side brackets or braces, matching order or property names, and handling undefined when elements are missing.

Explore how JavaScript handles object references, memory allocation, and copying with objects and arrays, revealing why reassigning and spread syntax affect original values.

Learn spread syntax to create shallow copies of objects and arrays with the spread operator, keeping originals intact. Place the spread at the beginning for predictable copies.

Learn how function invocation works in JavaScript by using parentheses to execute and return values, versus obtaining a function reference, and understand passing arguments for correct results.

Explore how promises manage asynchronous data flow in JavaScript, linking producing and consuming code with then and catch, and using fetch to handle pending, fulfilled, and rejected states.

Learn how to use async and await to simplify promises, convert functions into asynchronous ones, handle errors with try/catch, and compare with then and catch.

Discover what React components are and how to design reusable, nested components with props. Learn to structure apps with a root component and a tree of components for scalable interfaces.

Explore how React uses the virtual dom to manage updates and why manipulating the real dom directly breaks the app.

Create a new React app with npx create-react-app, start it with npm start, and build a basic social media app structure using index.js and App.js.

Organize your react app by creating modular files, sharing variables via a dedicated variables.js, and structuring folders (public, src, components) to improve maintainability and collaboration.

Master the export and import workflow in React by using default and named exports, importing from local files with dot slash and root paths, and managing module access across files.

Learn about the two main types of React components—class components and function components with hooks—and when to use each for better performance, while embracing hooks for added functionality.

Master class components by extending React.Component, using the render method to return JSX, and exporting and importing components for reuse.

Explore function components in React by building and rendering JSX, comparing with class components, and mastering exports, imports, and different function styles (declaration, expression, arrow) with debugging tips.

Master debugging with the terminal, chrome developer tools, and react developer tools to inspect console output, jsx rendering, and component props and state; install the extension to reveal component details.

Build and organize a React app by creating a component tree with header, posts list, and footer, and implement reusable post components to render multiple posts with varying content.

Explore React props as read-only properties passed to class and function components. Learn to render dynamic content with JSX, destructure props, and use numbers, booleans, and objects in examples.

Learn how React handles events with camelcase names like onClick, pass function references in JSX, and avoid quotes or parentheses to control when functions run.

Explore how to work with references inside a function component, comparing function declarations, expressions, and arrow functions, and how inner functions access component variables.

Learn how to handle function references in class components, resolve this binding using constructor and bind, and adopt arrow functions to simplify event handling.

Explore how browser default behaviors affect forms and events in React, learn to use the event object and preventDefault to stop page reloads, and handle onSubmit across different submission methods.

Learn to pass custom parameters to React onClick handlers by using inline arrow functions, handle the event object, and avoid invoking functions during render.

Learn how React uses component state to store user interactions and data, processing input and rendering updates to the user interface so users see list items or errors.

Differentiate stateless and stateful components, noting that stateful components control rendering. Explore class and function components, hooks, and the smart versus dumb component idea in React.

Explore how to manage state in class components using constructor, this.state, and setState to update counters and actions, while understanding re-rendering and multiple state keys.

Explore how to implement state in function components, using hooks to add stateful behavior and replace the old class-only approach, and understand the evolution from stateless to stateful components.

Explore how hooks, introduced in React 16.8 and now in React 18, enable state in function components, with rules that they run only at the top level of a function.

Master the React state hook (useState) to manage multiple state values in a function component, learn destructuring, standard setter naming, and updating state with counter increment and decrement.

Implement per-post like and dislike counts in a React app by adding local state in the post item component and updating counts with onClick handlers.

Discover how to manage posts with React state using an array, render them with map, and add new items by copying the array with the spread operator, ensuring unique keys.

Learn how to lift state up in a React app by modeling posts as objects with title, likes, and dislikes, computing totals, and passing data and callbacks through props.

Create a reusable React form component to add new posts, handle submission with onSubmit, prevent default behavior, and manage input data with React rather than the DOM.

Master controlled components in React by binding input value to state and handling onChange to update that state, then use the state on form submission to log the title.

Learn to create complex forms in React by using input types, managing per-field state, and handling onChange with inline or dedicated callbacks, plus camelCase properties like maxLength.

Set the initial form state without null, using an empty string or a value, and pair the value prop with onchange to keep inputs controlled and avoid warnings.

Master how the label element ties text to inputs, avoids placeholder pitfalls, and uses for attributes or nesting in React to ensure screen readers announce the correct fields.

Learn how React handles text areas like inputs, using value and defaultValue to create controlled and uncontrolled components with onchange. Explore placeholder and max length settings for accessible forms.

Learn to build a controlled select in React by binding its value to state, handling onChange, and rendering category options from an array with map and an empty option.

Learn to implement a checkbox in React using the checked property and onChange, converting it into a controlled component with boolean state via useState for form submission.

Learn to implement and manage radio button groups in React as controlled components, using state, onChange, and mapping status options (draft, published, archived) to render and validate selection.

Master how to validate forms in React by implementing client-side checks, collecting error messages in state, and conditionally rendering user feedback before submission.

Learn when to use uncontrolled components in React by leveraging refs to access the DOM for tasks like focusing inputs, text selection, animations, or third party libraries, while avoiding overuse.

Learn to use createRef in class components to reference dom elements, attach refs to inputs, and access current to focus or manipulate elements, including managing multiple refs for focus behavior.

Learn how to use useRef in a function component to manage input focus and avoid ref recreation, replacing createRef used in class components in practice.

Explore the file input tag in React by creating an uncontrolled component, handling single or multiple file selections, using accept and multiple attributes, and accessing the file list via event.target.files.

Implement an image preview in React by using a file input and a file reader to convert the selected image to base64, update state, and render a preview before upload.

Learn to lift state up to a common ancestor in a React app, share state between posts and form via props, and implement an add post flow with like/dislike updates.

Display dynamic post data by wiring a form to a post list and passing state data such as title, description, category, promote, status, and picture via props.

Display a success message after form submission with React state and conditional rendering. Learn to manage fields with state, clear the form, and reset the file input via a ref.

Explore how time-consuming functions affect user experience as data loads from a database, and use component lifecycle concepts to show feedback like 'calculating prime numbers' instead of delays.

Explore react class component lifecycles, including constructor, render, componentDidMount, componentDidUpdate, and componentWillUnmount, and learn how mounting, updating, and cleanup impact performance.

Demonstrates using the render method in a React class component to render from state and props, avoid mutating state in render, and improve UX with conditional rendering and loading indicators.

The constructor in a class component runs once at creation, initializes state with super, and avoids recalculation in render by using componentDidMount for post-render processing.

Explore how componentDidMount runs after mounting to start time-consuming tasks, display a 'Please wait' message, and use setTimeout to flush the UI before heavy processing.

Master componentDidUpdate in the updating lifecycle by inspecting previous props and state after render, enabling conditional data saving and preventing infinite loops through guarded state updates.

Unmount components and perform cleanups before destruction using componentwillmount to prevent memory leaks, such as clearing intervals created with setInterval and timers stored as class properties.

Explore how React class components mount, update, and unmount, and choose the lifecycle method to run code at each stage. Refer to documentation for rarely used methods like componentDidCatch.

Explore how function components use the effect hook to perform side effects like fetching data, with dependencies determining when the effect runs.

Explore how useEffect executes on every render or with a dependency array, mimicking componentDidUpdate, and learn to track changes in counter, username, and last action with multiple effects.

Learn how useEffect mimics componentDidMount by using an empty dependency array to run once on mount, while dependencies control re-execution; see state, import, and prime-number examples.

Use useEffect to return a cleanup function that runs before the next effect or on unmount, enabling cleanup, cache clearing, and memory leak prevention through a setInterval example.

We will style a React app using CSS and selectors, mastering the cascade, specificity, and the box model. Explore inline styling, basic CSS, and Sass for richer designs.

Learn to organize a React app by centralizing category and status data, creating getCategory and getStatus helpers, and using mock data for stable testing.

Mastering react js explains using inline styling with javascript style objects, camelcase properties, and the style prop, and warns about readability and performance compared to css.

Learn how to style a React app with CSS using index.css, apply className in JSX, and understand development versus production builds, including webpack bundling and the main.css output.

Mastering React JS teaches building self-contained components by organizing each component in its own folder with a dedicated CSS file, imported to scope styles, aiding reuse, maintainability, and production bundling.

Apply dynamic styling in React by using className with conditional logic to assign post item styles, including on sale labels, and combine CSS with inline styles for flexible UI.

Discover why to adopt sass for styling, learn how sass compiles to final css for the browser, compare sass and sax syntaxes, and set up sass in a React project.

Master sass nesting to streamline styles with precise selectors, from header logo to post component and form components, using nesting and the ampersand to control parent selectors.

Define a variable with a dollar sign at the top of your Sass file, then reuse it across selectors so the final CSS updates colors with one change.

Learn how to organize styles with Sass import, create a central variables.scss for a primary color, and import it across components to keep CSS consistent and scalable.

Learn how to use Sass mixins to reuse code, inject styles across components with include, and build self-contained components with arguments and content blocks.

Learn to style React apps with CSS and Sass, and integrate libraries like Bootstrap and React icons by installing, importing, and rendering components to display icons.

Apply CSS inside your React app using flexbox or grid for responsive layouts, controlling direction, wrap, and order while avoiding outdated floats and tables.

Master responsive web design by using viewport settings and media queries to adapt layouts across devices, employing breakpoints and responsive typography in React apps.

Learn to plan and translate client designs into a responsive React app styling with Sass, variables, and mixins, using Lobster and Roboto fonts, header styling, and breakpoints.

Style a responsive React app with mobile-first post cards that adapt to 1–3 columns using flex and breakpoints, including icons, status, promote, and a styled form and footer.