Js Variables — Free Javascript Tutorial

Learn Js Variables in Javascript with a free, beginner-friendly tutorial, examples and practice for Indian students on Syllab.in.

✓ 100% Free ✓ No Login Needed ✓ NCERT / CBSE Aligned ✓ Download as PDF

TL;DR: Learn Js Variables in Javascript with a free, beginner-friendly tutorial, examples and practice for Indian students on Syllab.in.

Written & reviewed by the Syllab.in Academic Team (CBSE/NCERT subject experts) · Updated Jul 14, 2026

🤖 Stuck on any question? Ask Syllab's free AI Tutor for a step-by-step explanation — instant, unlimited, no login.

Js Variables in Javascript

JavaScript has 3 ways to declare variables: var (old, function-scoped, avoid), let (modern, block-scoped, can be reassigned), and const (modern, block-scoped, cannot be reassigned). Always prefer const, then let.

JavaScript data types: String, Number, Boolean, null, undefined, Object, Array, Function. Use typeof to check a variable's type.

Template literals (backticks \

Learn Js Variables step by step with Syllab's free interactive Javascript tutorial — runnable code examples, practice exercises and instant AI feedback, all free with no signup. Explore the full Javascript course →