Composite
The Composite design pattern belongs to the structural patterns and brings the recommended solution to the situation when we are working with a tree structure. It is, for example, a recursively nested navigation menu, when each item can be either a menu item (leaf) or another submenu (subtree).
Motivation
We can encounter tree structures very often. Besides the already mentioned navigation menu, you have probably already needed a tree of product categories where the categories may contain other subcategories. Of course, the pattern can be used to represent a directory structure where a folder can contain both subfolders and files. From the design point of view, it makes sense to provide
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The Composite design pattern provides the recommended solution for working with tree structures, such as navigation menus.
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