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JavaScript Tutorial

Variables to closures, promises, the DOM and OOP — a complete JS reference.

Introduction to JavaScript

JavaScript is the programming language of the web — it runs in every browser and, via Node.js, on servers too.

JavaScript (JS) is a lightweight, interpreted (or JIT-compiled) language that adds interactivity to web pages: form validation, animations, dynamic content updates and full single-page applications.

  • Dynamically typed — variables don't have fixed types
  • Runs in every browser without installation
  • Multi-paradigm: procedural, object-oriented and functional
  • Standardized as ECMAScript (current spec: ES2024+)
  • Also runs server-side via Node.js and Deno
console.log("Hello, JavaScript!");

// Runs directly in any browser console or Node.js
Tip

Interviewers often ask 'is JavaScript the same as Java?' — no relation beyond the name; be ready to say that in one line.