# append(_:as:_:) Appends the given value’s bytes to this span’s bytes. ``` mutating func append(_ value: T, as type: T.Type, _ byteOrder: ByteOrder) where T : BitwiseCopyable, T : ConvertibleToBytes, T : FixedWidthInteger ``` ## Parameters `value` The value to store as raw bytes. `type` The type of the instance to store. `byteOrder` The order in which the bytes will be encoded to the span. ## Discussion There must be at least `MemoryLayout.size` bytes available in the span. --- 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)