<!--
{
  "availability" : [
    "iOS: 8.0.0 -",
    "iPadOS: 8.0.0 -",
    "macCatalyst: 13.0.0 -",
    "macOS: 10.10.0 -",
    "tvOS: 9.0.0 -",
    "visionOS: 1.0.0 -",
    "watchOS: 2.0.0 -"
  ],
  "documentType" : "symbol",
  "framework" : "Swift",
  "identifier" : "/documentation/Swift/UnsafeMutableBufferPointer/swapAt(_:_:)",
  "metadataVersion" : "0.1.0",
  "role" : "Instance Method",
  "symbol" : {
    "kind" : "Instance Method",
    "modules" : [
      "Swift"
    ],
    "preciseIdentifier" : "s:SrsRi_zrlE6swapAtyySi_SitF"
  },
  "title" : "swapAt(_:_:)"
}
-->

# swapAt(_:_:)

Exchanges the values at the specified indices of the buffer.

```
func swapAt(_ i: Int, _ j: Int)
```

## Parameters

`i`

The index of the first value to swap.

`j`

The index of the second value to swap.

## Discussion

Both parameters must be valid indices of the buffer, and not
equal to `endIndex`. Passing the same index as both `i` and `j` has no
effect.

---

Copyright &copy; 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)