What is Composite?
Treats single items and groups the same way. Tree structures where leaves and folders share one interface.
size() · files and folders alike
Composite lets clients treat…
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In real work
Composite: FileNode treats files and folders the same way, so both support size() in the backup report.
In the illustration
A probe asks the top folder for its size; each folder dial adds its children's dials, leaves first, and the total climbs up the tree to the top dial.
Model the folder tree in your coding agent as a composite: files and folders share one Node interface, and size() works the same on a leaf and on a tree.
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