Returns a Boolean value that indicates whether the set is a superset of
the given set.
Set A is a superset of another set B if every member of B is also a
member of A.
let employees: Set = ["Alicia", "Bethany", "Chris", "Diana", "Eric"]
let attendees: Set = ["Alicia", "Bethany", "Diana"]
print(employees.isSuperset(of: attendees))
// Prints "true"
Returns a Boolean value that indicates whether the set is a superset of
the given set.
Set A is a superset of another set B if every member of B is also a
member of A.
let employees: Set = ["Alicia", "Bethany", "Chris", "Diana", "Eric"]
let attendees: Set = ["Alicia", "Bethany", "Diana"]
print(employees.isSuperset(of: attendees))
// Prints "true"