BitWithBite
JavaScript Worksheet
⚡ Functions
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NameClassDate
After this worksheet you can
Declare functions and return valuesArrow functionsParameters vs argumentsDefault parameters📚 Quick Recap
Functions are the most important concept in JavaScript — possibly in all of programming. They let you package logic into a named, reusable unit that you can call anytime, anywhere. Without functions, every program would be a single enormous, unmaintainable block of code. In this lesson you'll learn every way to write a function in JS: declarations, expressions, arrow functions, closures, and higher-order functions.
🧠 Section A · Concept Check ● BEGINNER 4 × 1 = 4
1Values come back via:
2const f = () => 5 is an:
3function add(a,b) - a and b are:
4add(2,3) - 2 and 3 are:
🧮 Section B · Problem Solving ● INTERMEDIATE 2 + 3×3 = 11
5Declare: greet(){...}.
6Arrow syntax: const f = (x) x*2.
7Write square(n) as an arrow function.
8Write greet(name) returning `Hello name`.
9Difference: console.log vs return?
🚀 Section C · Challenge ● CHALLENGE 5
10Call: const f=(a,b=10)=>a+b; f(5) = ?
💭 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-B 4-B | 5 function 6 => 7 = const square = n => n * n; 8 = function greet(name){ return `Hello ${name}`; } 9 = log shows output; return hands the value to the caller | 10 = 15 (b defaults to 10)