Welcome to Part 9 of the JavaScript Machine Coding Interview Questions series! In this session, we’ll solve Question 6. This is a very common interview challenge that evaluates your ability to use JavaScript timing functions, event handling, and state management to create an accurate and interactive time-tracking tool.
✅ What You’ll Learn in This Video:
✔️ Structuring HTML for stopwatch display and control buttons
✔️ Using setInterval and clearInterval for start, stop, and reset functionality
✔️ Implementing lap recording to track intermediate times
✔️ Formatting time (minutes, seconds, milliseconds) for readability
✔️ Extending the app with a countdown timer mode as a bonus feature
💡 Why This Step Matters:
🔹 Strengthens your understanding of asynchronous JavaScript (timers & events)
🔹 Tests how well you can handle UI state updates in real time
🔹 Prepares you for practical interview tasks like performance monitoring or dashboards











