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JavaScript

JavaScript (commonly JS) duniya ki sabse widely-used programming language hai jo originally web…

Overview
🌟

JavaScript — Quick Facts

📌

Property: Detail

🎯

Language Name: JavaScript (JS)

Created By: Brendan Eich

🔑

Year: 1995

Topic 1
📥 📥 🧠 🔬 💡 🎯

Infobox

📚 | Property | Detail | |---|---| | Language Name | JavaScript (JS) | | Created By |…
Topic 2

Kya Hai JavaScript

💡 JavaScript ek high-level, interpreted (ya JIT-compiled) programming language hai jo web…
Topic 3
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History aur Evolution

💡

JavaScript ka Java se koi relation…

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Official naam: ECMAScript.…

Common use me sab "JavaScript" ya…

Topic 4

Kyun Zaroori Hai

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HTML = structure

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CSS = styling

JavaScript = behavior +…

🎯

Koi alternative nahi browser me…

Topic 5
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ECMAScript Standard

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ECMAScript = JavaScript ki…

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Ecma International maintain karta…

Har saal June me naya version…

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Browsers aur runtimes…

Topic 6
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JavaScript Engine aur Runtime

JavaScript Engines | Engine | Developer | Used In | Language | |---|---|---|---| | V8 |…
Topic 7
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Core Concepts

🌟 Variables | Keyword | Scope | Hoisting | Reassignment | Redeclaration |…
Topic 8
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Data Types

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"5" == 5 → true (string to number…

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"" == 0 → true

null == undefined → true

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[] == false → true

Topic 9
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Functions aur Closures

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Closures data privacy enable karte…

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Module pattern closures par based…

Event handlers me closures…

🎯

Memory leaks ka dhyan rakhna…

Topic 10

Asynchronous JavaScript

💡

async function hamesha Promise…

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await Promise resolve hone ka wait…

try/catch se error handling…

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Top-level await modules me…

Topic 11

Prototypes aur Classes

💡

Har object ka ek internal…

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Property lookup: object par nahi…

Object.create() se prototype-based…

🎯

Object.getPrototypeOf() se…

Topic 12

Modules System

Module Types | System | Syntax | Environment | Standard | |---|---|---|---| | ES Modules…
Topic 13

DOM Manipulation

💡

In-memory lightweight DOM…

🔑

Changes pehle virtual DOM me hote…

Diffing algorithm real DOM se…

🎯

Sirf changed parts real DOM me…

Topic 14

Event System

Event Model | Concept | Description | |---|---| | Event | Kuch hua (click, keypress,…
Topic 15
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Error Handling

🌟 Error Types | Error | Cause | |---|---| | SyntaxError | Invalid code syntax | |…
Topic 16

Frontend Frameworks

🚀 Major Frameworks Comparison | Framework | Creator | Year | Approach | Size (min+gzip) |…
Topic 17

Backend (Node.js)

📚 Node.js Key Features | Feature | Description | |---|---| | V8 Engine | Same Chrome…
Topic 18
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TypeScript

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Most popular JavaScript superset

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Large projects (50K+ lines) me…

Angular, NestJS me built-in

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React, Vue strongly recommend

Topic 19

Package Ecosystem (npm)

🎯 npm Facts | Metric | Value | |---|---| | Packages | 2,000,000+ | | Weekly downloads | 50+…
Topic 20

Build Tools

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Dev server — Native ESM, instant…

🔑

HMR — Lightning-fast Hot Module…

Build — Rollup-based optimized…

🎯

Framework agnostic — React, Vue,…

Topic 21

Testing

🔑 JavaScript Testing Tools | Tool | Type | Runner | Best For | |---|---|---|---| | Vitest |…
Topic 22
📊 🔬

Security Considerations

💡

npm audit regularly chalao

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Dependencies lockfile use karo…

CSP (Content Security Policy)…

🎯

User input hamesha sanitize karo

Topic 23
🌟

Performance Optimization

🌟 Key Techniques | Technique | Impact | Area | |---|---|---| | Code splitting | Smaller…
Topic 24
🚀

JavaScript Ecosystem Diagram

🚀 `mermaid flowchart TD subgraph Language["JavaScript / ECMAScript"] JS[JavaScript ES2024+]…
Topic 25

Framework Comparison Table

📚 | Feature | React | Vue | Angular | Svelte | |---|---|---|---|---| | Type | Library |…
Topic 26

Best Practices

💡 Code Quality 1. TypeScript use karo — Static types se bugs early catch 2. ESLint +…
Comparison

Framework Comparison Table

⚖️

Type: Library

⚖️

Language: JSX

⚖️

State: useState, Redux, Zustand

Diagram
📥 ⚙️ 🔬 💡

Visual Flow

📊 Diagram visualization — details in narration
Related Topics

See Also

📖

TypeScript

🔗

Node.js

💡

React

📚

Vue.js

🔑

HTML

🌐

CSS

Quick Quiz
🧠 QUIZ TIME

Quiz — Question 1

JavaScript ka sabse sahi definition kya hai?

Quick Quiz
🧠 QUIZ TIME

Quiz — Question 2

JavaScript ka 'Language Name' kya hai?

Complete! 🎉
COMPLETE

JavaScript Complete!

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JavaScript Complete

➡️

TypeScript

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