# subscript(of:id:) Returns and/or modifies the state for the equipment with given identifier and matching type. ``` subscript(of type: E.Type, id equipmentID: EquipmentIdentifier) -> E.State? where E : Equipment { get set } ``` ## Parameters `type` The type of the equipment. --- 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)