What edge cases should you handle in nested comments?
Empty children (no replies), very deep nesting (limit depth or add 'load more replies'), reply form (inline textarea), collapse state persistence, and vote updates. Use event delegation for efficient event handling.
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More FAQs in How to Build Nested Comments in an Interview
Use a tree data structure. Write a recursive render function that creates a div for each comment and recursively renders children. Add vote, reply, and collapse buttons. Use event delegation for clicks. Indent with marginLeft based on depth.
A tree: each comment is an object with id, text, votes, and children (array of comment objects). Children can have their own children, forming a tree. Render recursively.
Show an inline form (textarea) when reply is clicked. On submit, add a new comment object to the parent's children array. Re-render the children container. Use a unique ID (incrementing counter or UUID).
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