---
title: "grouping(_:)"
framework: swift
role: symbol
role_heading: Instance Method
path: "swift/duration/timeformatstyle/attributed-swift.struct/grouping(_:)"
---

# grouping(_:)

Returns a modified style that applies the given grouping rule to the highest field in the pattern.

## Declaration

```swift
func grouping(_ grouping: NumberFormatStyleConfiguration.Grouping) -> Duration.TimeFormatStyle.Attributed
```