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