🌐 Introduction to JavaScript

Last Updated: 01 Oct 2025

  • JavaScript (JS) is a programming language of the web.
  • It helps us make websites interactive (dynamic), not just static like HTML & CSS.
  • Runs inside the browser (like Chrome, Firefox, Edge).
  • Can also run outside browser using Node.js.
  • JavaScript statement is terminated by semicolon ;.

Hinglish Tip 🗣 : "JavaScript website ko zinda banata hai – jahan HTML structure deta hai, CSS design deta hai, aur JS usse interactive banata hai."

🕰 Short History of JavaScript

  1. 1995 → Created by Brendan Eich in just 10 days while working at Netscape.
    • Original name: Mocha, then renamed to LiveScript, and finally JavaScript.
  2. 1996 → Microsoft made its own version called JScript for Internet Explorer.
  3. 1997 → Standardized by ECMA International → Official name ECMAScript (ES).
  4. 2009 → Node.js introduced → JS could now run on servers also.
  5. 2015 → Big update: ES6 (ECMAScript 2015) introduced modern features (let, const, arrow functions, classes, etc.).
  6. Today → JavaScript is everywhere: Web, Mobile, Desktop, AI, and IoT.

Hinglish Tip 🗣 : "JS pehle sirf browser ke liye bana tha, lekin aaj ke time me backend, mobile apps, aur har jagah use hota hai."

✏ Features of JavaScript

  1. Easy to Learn – Simple syntax like English.
  2. Client-side Language – Runs in browser directly.
  3. Dynamic – You can update content without refreshing.
  4. Cross-platform – Works on Windows, Mac, Linux, Mobile.
  5. Event-driven – Reacts to clicks, typing, scrolling, etc.

💡 Where is JavaScript Used?

  • Web Development (Frontend + Backend)
  • Mobile Apps (React Native, Ionic)
  • Desktop Apps (Electron.js)
  • Game Development (Phaser.js, Babylon.js)
  • Server-side (Node.js)
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