How do I build infinite scroll in a machine coding interview?
Use IntersectionObserver to detect when a sentinel element at the bottom is visible. When visible, load more data and append. Show a loading indicator. Stop when there is no more data. Clean up the observer when done.
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More FAQs in Advanced Machine Coding Questions for Frontend Interviews
Star rating, nested comments (Reddit-style), tic-tac-toe, stopwatch, calculator, password strength meter, drag and drop list, tooltip, breadcrumb, and infinite scroll. These test recursion, game logic, APIs, and algorithms.
Create 5 star icons. On hover, highlight up to the hovered star. On click, lock the rating. Support half-stars with a clip or two separate icons. Add keyboard support (arrow keys to change, enter to select). Reset on mouse leave if not clicked.
Use a tree data structure. Write a recursive render function. Each comment has reply, vote, and collapse handlers. Indent nested comments by depth. Handle reply (add a child), vote (update score), and collapse (toggle children).
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