<!--
{
  "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/String/Index/samePosition(in:)-86cct",
  "metadataVersion" : "0.1.0",
  "role" : "Instance Method",
  "symbol" : {
    "kind" : "Instance Method",
    "modules" : [
      "Swift"
    ],
    "preciseIdentifier" : "s:SS5IndexV12samePosition2inABSgSS9UTF16ViewV_tF"
  },
  "title" : "samePosition(in:)"
}
-->

# samePosition(in:)

Returns the position in the given UTF-16 view that corresponds exactly to
this index.

```
func samePosition(in utf16: String.UTF16View) -> String.UTF16View.Index?
```

## Parameters

`utf16`

The view to use for the index conversion. This index
must be a valid index of at least one view of the string shared by
`utf16`.

## Return Value

The position in `utf16` that corresponds exactly to this
index. If this index does not have an exact corresponding position in
`utf16`, this method returns `nil`. For example, an attempt to convert
the position of a UTF-8 continuation byte returns `nil`.

## Discussion

The index must be a valid index of `String(utf16)`.

This example first finds the position of the character `"é"` and then
uses this method find the same position in the string’s `utf16` view.

```
let cafe = "Café"
if let i = cafe.firstIndex(of: "é") {
    let j = i.samePosition(in: cafe.utf16)!
    print(cafe.utf16[j])
}
// Prints "233"
```

---

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)