Introduction to JavaScript

• What is JavaScript?

• JavaScript vs ECMAScript

• How JavaScript works (Browser/Engine)

• Embedding JS: Inline, Internal, External

• JS Comments (Single-line & Multi-line)

• Console & Debugging with Developer Tools

JavaScript Basics

• Variables: var, let, const

• Data Types (Primitive & Reference)

• Type Conversion and Coercion

• Operators (Arithmetic, Comparison, Logical, Bitwise)

• Template Literals

• String and Number Methods

• Escape Characters

Control Structures

• if, else if, else

• switch statement

• Ternary Operator

• Loops:

  • for, while, do-while

  • for...in, for...of

Functions

• Function Declaration

• Function Expression

• Arrow Functions

• Parameters vs Arguments

• Return Statement

• Callback Functions

• IIFE (Immediately Invoked Function Expressions)

• Recursive Functions

Arrays

• Creating and Accessing Arrays

• Array Methods: push, pop, shift, unshift, slice, splice

• Iteration: forEach, map, filter, reduce, find, some, every

• Multidimensional Arrays

• Sorting & Reversing Arrays

Objects

• Object Literals & Properties

• Accessing & Modifying Properties

• this Keyword

• Nested Objects

• Object Methods

• Object Destructuring

• Object.keys(), Object.values()

DOM Manipulation

• What is the DOM?

• Selecting Elements: getElementById, querySelector, etc.

• Changing Content and Styles

• Creating and Removing Elements

• DOM Tree Traversal

• Events: click, submit, keydown, etc.

• Event Listeners & Event Delegation

• Forms and Validation

BOM (Browser Object Model)

• window, navigator, screen, location, history

• alert, prompt, confirm

• Timers: setTimeout, setInterval, clearTimeout

Error Handling & Debugging

• Types of Errors

• try...catch..

• Debugging with Browser DevTools

• Best Practices for Error Handling

ES6 and Modern JavaScript

• let, const, var recap

• Template Literals

• Arrow Functions

• Destructuring (Array & Object)

• Spread and Rest Operators

• Default Parameters

• for...of, for...in

• Optional Chaining

Classes & OOP in JavaScript

• What is OOP?

• Constructor Functions

• ES6 Classes

• this, super, new

• Inheritance

• Encapsulation

• Static Methods

• Getters & Setters

• Mixins

Closures & Scope

• Global vs Local Scope

• Function Scope vs Block Scope

• Lexical Scope

• Closures Explained with Examples

• Use Cases of Closures

Asynchronous JavaScript

• What is Async Programming?

• setTimeout, setInterval

• Callbacks & Callback Hell

• Promises: resolve, reject, .then, .catch

• async / await

• Error Handling with try...catch in async

JavaScript and the Web

• Form Handling

• Fetch API (GET, POST)

• Working with JSON

• Fetch

• REST API consumption

Storage in JavaScript

• localStorage and sessionStorage

• cookies

• JSON

Advanced JavaScript Concepts

• Higher-Order Functions

• Event Loop, Call Stack

• bind(), call(), apply()

JavaScript Projects

• Navbar

• Sticky Navbar

• Shrinking Navbar

• Sidebar with Multiple Features

• Background Color Changer using Closure

• Word Counter

• Random Color Generator with Color Type

• Form Validation with Multiple Features

• Text to Voice Converter with Multiple Features

• Image Slider with Multiple Features

• QR Code Generator

• Dark Mode Implementation

• Music Player with Multiple Features

• To-Do List with Multiple Features

Tailwind CSS

1. Layout & Spacing

   • container, mx-auto, p-, m-, space-x-, space-y-

   • flex, grid, gap-, justify-, items-

2. Typography

   • text-[size], font-bold, font-medium, font-light

   • text-center, text-left, text-right, leading-, tracking-

3. Colors & Backgrounds

   • text-[color], bg-[color], hover:bg-, hover:text-

   • bg-gradient-to-r, from-, to-, via-

4. Borders & Shadows

   • border, border-[color], rounded, rounded-[size]

   • shadow, shadow-md, hover:shadow-lg

5. Buttons & Hover Effects

   • hover:, transition, duration-, ease-in, ease-out

Tailwind CSS

1. Display & Visibility

   • block, inline-block, hidden, flex, grid

   • visible, invisible

2. Positioning & Z-Index

   • relative, absolute, fixed, top-, left-, z-

3. Width & Height

   • w-, h-, min-w-, max-w-, min-h-, max-h-

4. Responsive Design

   • sm:, md:, lg:, xl:, 2xl: (for any utility)

5. Custom Utilities

• overflow-, cursor-pointer, opacity-, transition, transform, scale-, rotate-

Introduction to React

• What is React? Why use React?

• SPA (Single Page Applications)

• Virtual DOM & Real DOM

• JSX Syntax

• Setup with:

  • CDN (basic)

  • Create React App (CRA)

  • Babel, Vite (alternative build tool)

Basic React Concepts

• Components (Function-based)

• Props (Properties)

• State (useState)

• Event Handling

• Conditional Rendering (if, ternary, &&)

• Lists and Keys (.map() with key)

• Basic Form Handling

• onChange, onSubmit events

Lifecycle Methods

Class-Based

• constructor()

• componentDidMount()

• componentDidUpdate()

• componentWillUnmount()

React Project Structure

• Components, Assets, Utils

• Reusable components

• Managing CSS:

  • CSS Modules

  • Tailwind CSS

  • Styled-components

React Hooks

• useState – state management

• useEffect – lifecycle management

Routing in React

• React Router DOM v6+

• Nested Routes

• Dynamic Route Params

• useParams, useNavigate

Forms in React

• Controlled vs Uncontrolled Components

• Input, Textarea, Checkbox, Radio, Select

• Form Validation (manual + with libraries like Formik and Yup)

API Integration

• Fetching data using fetch

• Async/await and error handling

• Loading & error UI states

• Working with REST APIs

• Using useEffect with APIs

Context API (Global State)

• Creating and using Context

• Provider and Consumer

React with External Libraries

• UI Libraries: Tailwind

• State Management: Redux Toolkit

• Form Libraries: Formik

Redux Toolkit (Advanced State Management)

• Core Concepts: Store, Slice, Reducer, Actions

• createSlice(),

• Connecting Redux to React using Provider and useSelector, useDispatch

Custom Hooks

• Creating custom reusable hooks

• Hook conventions and best practices

Error Handling and Boundaries

• Try-catch with async code

• Error UI components

Performance Optimization

• Code Splitting with React.lazy() and Suspense

• DevTools & Chrome React Extension

Deployment

• Build production version with npm run build

• Hosting options:

  • Netlify

React Projects

• To-Do List

• Accordion

• Search Bar

• Form Validation

• Image Slider

• Chips Input

• Blog Viewer

• Mini Food App
• Food Ordering Website like Swiggy (API + Redux) — Major Project
•  Figma to component conversion —  Major Project

Version Control

• git init – Initialize a new Git repository

• git clone <repo-url> – Copy a GitHub repo to your local system

• git status – Check the status of your files

• git add . – Stage all changes

• git commit -m "message" – Commit changes with a message

• git push – Push local commits to GitHub

• git pull – Pull latest changes from GitHub

• git log – View commit history

• git branch – Check current branch / list branches

• git checkout -b branch-name – Create and switch to a new branch

• git merge branch-name – Merge another branch into current branch

• git remote -v – Show connected remote repositories

• git reset / git checkout – Undo changes (with caution)

Uses of AI in React & JavaScript Development

1. Code Autocompletion – Use GitHub Copilot or Tabnine for instant code suggestions.

2. Bug Fixing – Paste errors into AI to understand and fix them quickly.

3. React Component Generator – Ask AI to generate reusable components fast.

4. Regex & Validation Help – Get complex regex patterns for form validation.

5. API Integration Help – AI explains how to fetch, handle, and display API data.

6. Smart Comments & Docs – Generate readable comments and function docs.

7. Test Case Generator – Use AI to create basic unit tests for your components.

Bonus

• useRef, useCallback,useMemo 

• Prepare for real-world React interviews

  • Components, Hooks, API Integration, Redux

• Practice frontend interview questions

  • HTML, CSS, JavaScript, Bootstrap

• Learn to apply on top job portals

  • LinkedIn, Naukri, Internshala, Cutshort

• Get smart strategies for job applications

  • Resume keyword optimization

  • Job seeker profile building