What edge cases should you handle in a progress bar?
Clamp the value to 0-100 (no negative or over 100), smooth animation with CSS transition, auto-increment mode (setInterval), and different colors for different ranges (red for low, green for high).
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More FAQs in How to Build a Progress Bar in an Interview
Create a container div with an inner fill div. Set the fill's width based on a percentage. Use CSS transition for smooth animation. Add buttons to change the progress. Clamp the value to 0-100. Display the percentage.
Use CSS transition on the width property: transition: width 0.3s ease. When you change the width via JavaScript (bar.style.width = progress + '%'), the CSS transition animates the change smoothly.
Use setInterval: const interval = setInterval(() => { progress += 1; updateProgress(); if (progress >= 100) clearInterval(interval); }, 100). This increments the progress by 1 every 100ms until it reaches 100.
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