Options.isStrictSubset(of:)

Description#

Set A is a strict subset of another set B if every member of A is also a member of B and B contains at least one element that is not a member of A.

let employees: Set = ["Alicia", "Bethany", "Chris", "Diana", "Eric"] let attendees: Set = ["Alicia", "Bethany", "Diana"] print(attendees.isStrictSubset(of: employees)) // Prints "true"

// A set is never a strict subset of itself: print(attendees.isStrictSubset(of: attendees)) // Prints "false"

• Parameter other: A set of the same type as the current set.
• Returns: true if the set is a strict subset of other; otherwise, false.