# subscript(_:) Accesses the value stored for the given session property key. ``` final subscript(key: K.Type) -> K.Value where K : SessionPropertyKey { get set } ``` ## Parameters `key` The session property key type whose value to read or write. --- 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)