---
title: "init(memberStyle:)"
framework: foundation
role: symbol
role_heading: Initializer
path: "foundation/listformatstyle/init(memberstyle:)"
---

# init(memberStyle:)

Creates an instance using the provided format style.

## Declaration

```swift
init(memberStyle: Style)
```

## Parameters

- `memberStyle`: The doc://com.apple.foundation/documentation/Foundation/FormatStyle applied to elements of the doc://com.apple.documentation/documentation/Swift/Sequence.

## Discussion

Discussion The input type of memberStyle must match the type of an element in the sequence. The output type is a string. The following example uses a FloatingPointFormatStyle.Descriptive member style to spell out a list: [-3.0, 9.0, 11.6].formatted(.list(memberStyle: .descriptive, type: .and)) // minus three, nine, and eleven point six