The Frontend Lab Interview Prep · JavaScript
Top JavaScript Closure Questions
The JavaScript questions that come up in real frontend loops, with crisp answers.
3 questions — click any to reveal the answer.
01What is the single most common JavaScript question?easy
Start with the definition, then give a short, concrete example, then mention one edge case.
02Explain a tricky JavaScript concept interviewers probe.medium
Name the concept, contrast it with a similar one, and finish with when you'd actually reach for it.
03A senior-level JavaScript follow-up.hard
Walk through the trade-offs out loud — interviewers care about your reasoning more than the perfect answer.