isSubset(of:)

Returns a Boolean value that indicates whether the set is a subset of another set.

Declaration

func isSubset(of other: Self) -> Bool

Parameters

other:
A set of the same type as the current set.

Return Value

true if the set is a subset of other; otherwise, false.

Discussion

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"