---
title: "append(_:as:_:)"
framework: Swift
role: symbol
role_heading: Instance Method
platforms: [iOS 27.0+, iPadOS 27.0+, Mac Catalyst 27.0+, macOS 27.0+, tvOS 27.0+, visionOS 27.0+, watchOS 27.0+]
path: "swift/outputrawspan/append(_:as:_:)"
---

# append(_:as:_:)

Appends the given value’s bytes to this span’s bytes.

## Declaration

```swift
mutating func append<T>(_ 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

Discussion There must be at least MemoryLayout<T>.size bytes available in the span.