Golang Design Patterns - Template Method Pattern
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Interpreter parses a small order string like "L:latte+milk+sugar" into a structured drink object using a simple grammar.
Visitor lets a coffee shop run different operations — tax, discount, calories — over the same menu items without modifying the item classes themselves.
Mediator centralizes communication between a coffee shop's barista, cashier, and kitchen so they no longer need to reference each other directly.
Memento captures and restores an order's state, giving a coffee shop's order flow an undo button without breaking encapsulation.