---
title: "notation(_:)"
framework: foundation
role: symbol
role_heading: Instance Method
path: "foundation/decimal/formatstyle/notation(_:)"
---

# notation(_:)

Modifies the format style to use the specified notation.

## Declaration

```swift
func notation(_ notation: Decimal.FormatStyle.Configuration.Notation) -> Decimal.FormatStyle
```

## Parameters

- `notation`: The notation to apply to the format style.

## Return Value

Return Value A decimal format style modified to use the specified notation.

## Discussion

Discussion The following example creates a default Decimal.FormatStyle for the en_US locale, and a second style that uses scientific notation style. It then applies each style to an array of decimal values. let defaultStyle = Decimal.FormatStyle(locale: Locale(identifier: "en_US")) let scientificStyle = defaultStyle.notation(.scientific) let nums: [Decimal] = [100.1, 1000.2, 10000.3, 100000.4, 1000000.5] let defaultNums = nums.map { defaultStyle.format($0) } // ["100.1", "1,000.2", "10,000.3", "100,000.4", "1,000,000.5"] let scientificNums = nums.map { scientificStyle.format($0) } // ["1.001E2", "1.0002E3", "1.00003E4", "1.000004E5", "1E6"]

## See Also

### Customizing style behavior

- [decimalSeparator(strategy:)](foundation/decimal/formatstyle/decimalseparator(strategy:).md)
- [grouping(_:)](foundation/decimal/formatstyle/grouping(_:).md)
- [locale(_:)](foundation/decimal/formatstyle/locale(_:).md)
- [precision(_:)](foundation/decimal/formatstyle/precision(_:).md)
- [rounded(rule:increment:)](foundation/decimal/formatstyle/rounded(rule:increment:).md)
- [scale(_:)](foundation/decimal/formatstyle/scale(_:).md)
- [sign(strategy:)](foundation/decimal/formatstyle/sign(strategy:).md)
- [Decimal.FormatStyle.Configuration](foundation/decimal/formatstyle/configuration.md)
- [NumberFormatStyleConfiguration](foundation/numberformatstyleconfiguration.md)