---
title: "sectionIdentifier(forSectionContainingItemIdentifier:)"
framework: appkit
role: symbol
role_heading: Instance Method
path: "appkit/nsdiffabledatasourcesnapshotreference/sectionidentifier(forsectioncontainingitemidentifier:)"
---

# sectionIdentifier(forSectionContainingItemIdentifier:)

Returns the identifier of the section containing the specified item in the snapshot.

## Declaration

```swift
func sectionIdentifier(forSectionContainingItemIdentifier itemIdentifier: Any) -> Any?
```

## Parameters

- `itemIdentifier`: The identifier of the item contained in the section of the snapshot.

## Return Value

Return Value The identifier of the section containing the specified item, or nil if the specified item doesn’t exist in any section of the snapshot.

## See Also

### Identifying items and sections

- [itemIdentifiers](appkit/nsdiffabledatasourcesnapshotreference/itemidentifiers.md)
- [sectionIdentifiers](appkit/nsdiffabledatasourcesnapshotreference/sectionidentifiers.md)
- [index(ofItemIdentifier:)](appkit/nsdiffabledatasourcesnapshotreference/index(ofitemidentifier:).md)
- [index(ofSectionIdentifier:)](appkit/nsdiffabledatasourcesnapshotreference/index(ofsectionidentifier:).md)
- [itemIdentifiersInSection(withIdentifier:)](appkit/nsdiffabledatasourcesnapshotreference/itemidentifiersinsection(withidentifier:).md)