---
title: "append(contentsOf:)"
framework: foundation
role: symbol
role_heading: Instance Method
path: "foundation/data/append(contentsof:)-2ebzw"
---

# append(contentsOf:)

## Declaration

```swift
@abi(func append(fastContentsof elements: some Sequence<UInt8>)) mutating func append(contentsOf elements: some Sequence<UInt8>)
```