Removes the elements of the set that are also in the given set and adds the members of the given set that are not already in the set.
Required. Default implementation provided.
Swift Standard Library
A set of the same type.
In the following example, the elements of the employees set that are also members of neighbors are removed from employees, while the elements of neighbors that are not members of employees are added to employees. In particular, the names "Bethany" and "Eric" are removed from employees while the name "Forlani" is added.