# firstRange(of:) Finds and returns the range of the first occurrence of a given collection within this collection. ``` func firstRange(of other: C) -> Range? where C : Collection, Self.Element == C.Element ``` ## Parameters `other` The collection to search for. ## Return Value A range in the collection of the first occurrence of `sequence`. Returns `nil` if `sequence` is not found. --- 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)