How do you collapse/expand comments in JavaScript?
Toggle the display of the children container: childrenContainer.style.display = isVisible ? 'none' : 'block'. Update the button text (Collapse/Expand). Use event delegation to handle the click.
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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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