# compare(_:options:range:locale:) Compares the string using the specified options and returns the lexical ordering for the range. ``` func compare(_ aString: T, options mask: String.CompareOptions = [], range: Range? = nil, locale: Locale? = nil) -> ComparisonResult where T : StringProtocol ``` --- 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)