What edge cases should you handle in a file explorer?
Empty folders (no children), very deep nesting (performance, consider lazy loading), files at the root level, and maintaining toggle state (which folders are open). Also handle clicking on a file (no expand/collapse).
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More FAQs in How to Build a File Explorer in an Interview
Use a tree data structure (objects with name, type, children). Write a recursive function to render each node. Folders have a click handler to expand/collapse children. Use indentation based on depth and icons for files/folders.
Write a function that creates a DOM element for the current node, then recursively calls itself for each child. Append the children to a container. For folders, add a click handler to toggle the children's visibility.
A tree structure: each node is an object with name, type (file or folder), and children (array of child nodes, only for folders). Files have no children. Folders can have nested folders and files.
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