Challenge 1
Complete the multiplication expression.
javascript
Your answer
const total = 6 7;Press Ctrl⌘Enter to check your answer
Code Completion
6 Challenges
Complete the expressions
Practice operators, short-circuiting, nullish coalescing, conditional expressions, and grouping by completing real JavaScript code.
Beginner
~7 min read
Challenge 2
Complete the strict comparison.
javascript
Your answer
const same = 10 "10";Press Ctrl⌘Enter to check your answer
Challenge 3
Complete the nullish fallback.
javascript
Your answer
const name = undefined ?? ;Press Ctrl⌘Enter to check your answer
Challenge 4
Complete the conditional expression that chooses the larger label.
javascript
Your answer
const label = score >= 50 "Pass" : "Retry";Press Ctrl⌘Enter to check your answer
Challenge 5
Add grouping so addition happens before multiplication.
javascript
Your answer
const total = * 4;Press Ctrl⌘Enter to check your answer
Challenge 6
Complete the operator that assigns only when the value is nullish.
javascript
Your answer
let value;
value 10;Press Ctrl⌘Enter to check your answer