When collections share mutable items, a deep copy using a for loop should be used to explicitly clone items before adding them to a new collection.

Question

Quizplus · Accepted Answer

Mutable items can cause unexpected behavior if they are shared between collections, so it is best practice to create a deep copy of each mutable item before adding it to a new collection to ensure that any changes made to the original item do not affect the new collection. This can be achieved using a for loop that iterates over the original collection and creates a new copy of each item before adding it to the new collection.

When Collections Share Mutable Items, a Deep Copy Using a for Loop