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This is how you build a shared cart for an office community or group of friends that will be useable, clear, and secure. We’ll group the menu items into categories with different titles, prices, size in grams, and all sorts of additional details. The service returns the list of predefined objects but it can be changed at any given time, for example, for it to make a backend request. We use Cloud FireStore to store the data. For the menu we’ve developed, use the AngularFire2 library and Firebase.