# decodeIfPresent(_:) Decodes a value of the given type, if present. ``` mutating func decodeIfPresent(_ type: T.Type) throws -> T? where T : Decodable ``` ## Parameters `type` The type of value to decode. ## Return Value A decoded value of the requested type, or `nil` if the value is a null value, or if there are no more elements to decode. ## Discussion This method returns `nil` if the container has no elements left to decode, or if the value is null. The difference between these states can be distinguished by checking `isAtEnd`. > throws: `DecodingError.typeMismatch` if the encountered encoded value > is not convertible to the requested type. --- 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)