the following operators:

$+=$ Contact $-$ Adds a single contact to a ContactBook object

$+=$ ContactBook $-$ Adds all contacts from the passed in ContactBook to this object. Adding

them to the back in the order they are in the other ContactBook$$s array.

$+$ ContactBook $-$ Adds two contact books together and returns the resulting ContactBook.

$-=$ Contact $-$ Removes the Contact that matches the passed$-$in Contact.

$-=$ ContactBook $-$ Removes all contacts from a passed in ContactBook from this object

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$5$ HELPFUL LINKS

$-$ ContactBook $-$ Same as above, but returns a new ContactBook object as the result instead

of modifying the current one

$==$ ContactBook $-$ Equality operator, if two ContactBooks have all the same Contacts in

them, in any order. Meaning that contacts may not exactly be in the same order in both

arrays in each of the ContactBooks.

$!=$ ContactBook $-$ Same as above, but the not equal operator