All challenges
Code AnalysisBeginner 60s

Trace: Object.keys

What does this print?
Starter code
const obj = { a: 1, b: 2, c: 3 };
console.log(Object.keys(obj).length);

Think you can answer under pressure?

Get matched and answer live questions in 3-minute 1v1 battles. Elo ranking, badge tiers and bragging rights on the line.

Play this in a 3-minute battle