Question: Why not have a single Co17ection data type that implements methods to add items, remove the most recently inserted item, remove the least recently inserted

Why not have a single Co17ection data type that implements methods to add items, remove the most recently inserted item, remove the least recently inserted item, remove a random item, iterate over the items, return the number of items in the collection, and whatever other operations we might desire? Then we could get them all implemented in a single class that could be used by many clients.

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