bagDifference: The difference of two bags is a new bag containing the entries that would be left in one bag after removing those that also occur in the second. Design and specify a method difference for the ArrayBag that returns as a new bag the difference of the bag receiving the call to the method and the bag that is the method's parameter. The method signature is:

ArrayBag bagDifference(const ArrayBag &otherBag) const;

Note that the difference of two bags might contain duplicate items. For example, if object x occurs five times in one bag and twice in another, the difference of these bags contains x three times.

Example run: https://i.imgur.com/4ee5TS9.png