[[ This is Recording of my course with all the questions discussions that happened ]]

This Course focues on building right mental model around javascript and React. Whatever is there in the course is the foundational things that everyone should know.

These are not everything, but these are mandatory thing, the first steps.

Language: HINDI

What it contains:

🧠 JavaScript Full Course Outline

📘 Part 1: Foundations

Day 1: Course Intro, Path to Success
Day 2: JavaScript Introduction, Data Types
Day 3: Objects, Symbols, Truthy and Falsy Values
Day 4 (Part 1): Loops and Functions
Day 4 (Part 2): Functions Continued (return, parameters, scope, pure vs impure)

⚙️ Part 2: Core Concepts

Day 5: JavaScript Classes
Day 6: Hoisting, == vs ===, Shallow and Deep Copy
Day 7: Coercion, Scope, Lexical Scope
Day 8: Closures
Day 9: this, call, bind, apply

🌐 Part 3: Asynchronous JavaScript

Day 10: Callbacks, Promises (Part 1)
Day 11: Promise Chaining (Part 2)
Day 12: async / await, Promise.all()

🔄 Part 4: Event System & Browser Interaction

Day 13: Event Loop (Microtask, Macrotask, Queue)
Day 15: DOM Manipulation, Event Bubbling, Capturing, Delegation, Debouncing
Day 16: Currying, Throttling, Prototypal Inheritance

🧩 Part 5: Advanced Objects & Data Structures

Day 17: Prototypes (in depth)
Day 18: Maps and WeakMaps

What is a Map?
Difference between Map and Object
When to use Map
Iterating over a Map
Practical examples (e.g., caching results, counting frequency)
What is a WeakMap?
Key characteristics (keys must be objects, garbage collection)
Real-world use cases (private data storage for objects, memory-efficient caches)

Day 19: Sets and WeakSets

What is a Set?
Difference between Set and Array
Built-in methods: add(), has(), delete(), size, forEach()
Modern Set methods: union, intersection, difference, symmetricDifference, isSubsetOf, isSupersetOf
What is a WeakSet?
Use cases (tracking object presence, memory-safe object collections)

🧰 Part 6: Utilities and Patterns

Day 20:

Currying
Memoization using Map/WeakMap
Event Delegation patterns

React Content

📅 Day 1 – Intro Session

What is React?
History & evolution of frontend frameworks
Course structure & expectations
What you need to know before learning React

📅 Day 2 – Why React? and Why Not React?

Problems React solves vs traditional DOM manipulation
SPA vs MPA architecture
Pros & cons of React in real projects
When NOT to use React

📅 Day 3 – Why we need Server, devDeps, Vite?

Why frontend apps need servers
Local dev server vs production build
What devDependencies are and why they matter
Introduction to Vite (why it’s faster than CRA/Webpack)

📅 Day 4 – JSX

What is JSX and why React uses it
JSX vs JavaScript
Rules of JSX (expressions, fragments, return, wrapping)
Common JSX gotchas

📅 Day 5 – Components

Function & class components (brief intro)
Component naming rules
Reusability & composition
Props vs hardcoded data

📅 Day 6 – useState (Part 1)

Introducing state in React
useState syntax & working
Initial state, updating state, async updates
Primitive vs object/array state

📅 Day 7 – useState and Props

Component communication
Passing data via props
Parent → child and child → parent state flow
State lifting patterns

📅 Day 8 – useEffect and useLayoutEffect

Why effects are needed
Side effects: API calls, listeners, timers
Dependency array rules
useLayoutEffect vs useEffect

📅 Day 9 – useRef and Custom Hooks

When to use refs (DOM access, storing mutable values)
useRef vs useState
Extracting logic into a custom hook
Creating reusable data + UI logic

📅 Day 10 – Context API, Provider, and Custom Hooks

Prop drilling problem
Creating and consuming context
Context Provider pattern
Using custom hooks to access context

📅 Day 11 – Component Communication

Parent → Child, Child → Parent, Sibling communication
Using callbacks for event bubbling
Using context vs props for communication
When to choose what

📅 Day 12 – Memoization (memo, useCallback, useMemo)

Why React re-renders
Preventing unnecessary re-renders
Using memo for component caching
useCallback vs useMemo difference & real use cases

📅 Day 13 – Lazy Loading, Code Splitting, Suspense

React.lazy & dynamic imports
Route-based vs component-based code splitting
Suspense boundaries
Performance benefits & bundle size reduction

📅 Day 14 – React Router

SPA navigation
Basic routing (Route, Link, BrowserRouter)
Dynamic routes, useParams, nested routes