BitWithBite
JavaScript Worksheet
⚡ Variables & Data Types
SCORE___ / 20
NameClassDate
After this worksheet you can
Declare with let and constKnow when to use constIdentify types with typeofName variables correctly📚 Quick Recap
🎯 What you'll learn: How to store data with variables using var, let, and const, JavaScript's 7 primitive data types, how typeof works, the quirky world of type coercion, and why null !== undefined.
🧠 Section A · Concept Check ● BEGINNER 4 × 1 = 4
1Which cannot be reassigned?
2typeof 'hi' is:
3typeof 42 is:
4Valid name:
🧮 Section B · Problem Solving ● INTERMEDIATE 2 + 3×3 = 11
5Declare a changeable variable with .
6Declare a constant with .
7Declare score starting at 0.
8Why does const pi = 3.14; pi = 3; fail?
9What is typeof null (the famous quirk)?
🚀 Section C · Challenge ● CHALLENGE 5
10Declare your name as a constant.
💭 Reflection — the most useful thing I learned:
A ___/4 B ___/11 C ___/5 Total ___/20
Teacher's Signature
Parent's Signature
✂ answer key — fold or cut before handing out
1-B 2-B 3-C 4-C | 5 let 6 const 7 = let score = 0; 8 = const cannot be reassigned (TypeError) 9 = 'object' | 10 = const name = 'Ali';