Wiki Article · Cinematic

JavaScript

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

Overview

JavaScript — Quick Facts

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Property: Detail

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Language Name: JavaScript (JS)

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Created By: Brendan Eich

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Year: 1995

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Infobox

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

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Kya Hai JavaScript

💡 JavaScript ek high-level, interpreted (ya JIT-compiled) programming language hai jo web…

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History aur Evolution

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JavaScript ka Java se koi relation…

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Official naam: ECMAScript.…

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Common use me sab "JavaScript" ya…

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Kyun Zaroori Hai

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HTML = structure

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CSS = styling

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JavaScript = behavior +…

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Koi alternative nahi browser me…

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ECMAScript Standard

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ECMAScript = JavaScript ki…

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Ecma International maintain karta…

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Har saal June me naya version…

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Browsers aur runtimes…

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JavaScript Engine aur Runtime

✨ JavaScript Engines | Engine | Developer | Used In | Language | |---|---|---|---| | V8 |…

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Core Concepts

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Data Types

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"5" == 5 → true (string to number…

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"" == 0 → true

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null == undefined → true

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[] == false → true

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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…

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Event handlers me closures…

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Memory leaks ka dhyan rakhna…

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Asynchronous JavaScript

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async function hamesha Promise…

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await Promise resolve hone ka wait…

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try/catch se error handling…

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Top-level await modules me…

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Prototypes aur Classes

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Har object ka ek internal…

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Property lookup: object par nahi…

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Object.create() se prototype-based…

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Object.getPrototypeOf() se…

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Modules System

⭐ Module Types | System | Syntax | Environment | Standard | |---|---|---|---| | ES Modules…

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DOM Manipulation

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In-memory lightweight DOM…

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Changes pehle virtual DOM me hote…

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Diffing algorithm real DOM se…

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Sirf changed parts real DOM me…

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Event System

✨ Event Model | Concept | Description | |---|---| | Event | Kuch hua (click, keypress,…

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Error Handling

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

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Frontend Frameworks

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Backend (Node.js)

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

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TypeScript

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Most popular JavaScript superset

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Large projects (50K+ lines) me…

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Angular, NestJS me built-in

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React, Vue strongly recommend

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Package Ecosystem (npm)

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

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Build Tools

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Dev server — Native ESM, instant…

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HMR — Lightning-fast Hot Module…

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Build — Rollup-based optimized…

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Framework agnostic — React, Vue,…

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Testing

🔑 JavaScript Testing Tools | Tool | Type | Runner | Best For | |---|---|---|---| | Vitest |…

Topic 22

Security Considerations

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npm audit regularly chalao

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Dependencies lockfile use karo…

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CSP (Content Security Policy)…

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User input hamesha sanitize karo

Topic 23

Performance Optimization

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

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JavaScript Ecosystem Diagram

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

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Framework Comparison Table

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

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Best Practices

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

Comparison

Framework Comparison Table

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Type: Library

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Language: JSX

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State: useState, Redux, Zustand

Diagram

Visual Flow

📊 Diagram visualization — details in narration

Quiz — Question 1

JavaScript ka sabse sahi definition kya hai?

Quick Quiz

Quiz — Question 2

JavaScript ka 'Language Name' kya hai?

Complete! 🎉

JavaScript Complete!

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JavaScript Complete

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