# subscript(_:) Accesses the code unit at the given position. ``` subscript(i: String.UTF8View.Index) -> UTF8.CodeUnit { get } ``` ## Parameters `i` A valid index of the view. `i` must be less than the view’s end index. ## Overview The following example uses the subscript to print the value of a string’s first UTF-8 code unit. ``` let greeting = "Hello, friend!" let i = greeting.utf8.startIndex print("First character's UTF-8 code unit: \(greeting.utf8[i])") // Prints "First character's UTF-8 code unit: 72" ``` --- 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)