# init(_:) Creates a new set from a finite sequence of items. ``` init(_ sequence: S) where S : Sequence, Self.Element == S.Element ``` ## Parameters `sequence` The elements to use as members of the new set. ## Discussion Use this initializer to create a new set from an existing sequence, like an array or a range: ``` let validIndices = Set(0..<7).subtracting([2, 4, 5]) print(validIndices) // Prints "[6, 0, 1, 3]" ``` --- 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)