# intersection(_:) Returns a new set with the elements that are common to both this set and the given sequence. ``` func intersection(_ other: S) -> Set where Element == S.Element, S : Sequence ``` ## Parameters `other` A sequence of elements. `other` must be finite. ## Return Value A new set. ## Discussion In the following example, the `bothNeighborsAndEmployees` set is made up of the elements that are in *both* the `employees` and `neighbors` sets. Elements that are in only one or the other are left out of the result of the intersection. ``` let employees: Set = ["Alicia", "Bethany", "Chris", "Diana", "Eric"] let neighbors = ["Bethany", "Eric", "Forlani", "Greta"] let bothNeighborsAndEmployees = employees.intersection(neighbors) print(bothNeighborsAndEmployees) // Prints "["Bethany", "Eric"]" ``` --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)