---
title: "sign(strategy:)"
framework: foundation
role: symbol
role_heading: Instance Method
path: "foundation/floatingpointformatstyle/sign(strategy:)"
---

# sign(strategy:)

Modifies the format style to use the specified sign display strategy for displaying or omitting sign symbols.

## Declaration

```swift
func sign(strategy: FloatingPointFormatStyle<Value>.Configuration.SignDisplayStrategy) -> FloatingPointFormatStyle<Value>
```

## Parameters

- `strategy`: The sign display strategy to apply to the format style, such as doc://com.apple.foundation/documentation/Foundation/NumberFormatStyleConfiguration/SignDisplayStrategy/automatic or doc://com.apple.foundation/documentation/Foundation/NumberFormatStyleConfiguration/SignDisplayStrategy/never.

## Return Value

Return Value A floating-point format style modified to use the specified sign display strategy.

## Discussion

Discussion The following example creates a default FloatingPointFormatStyle for the en_US locale, and a second style that displays a sign for all values except zero. It then applies each style to an array of floating-point values. The formatting that the modified style applies adds the negative (-) or positive (+) sign to all the numbers. let defaultStyle = FloatingPointFormatStyle<Double>(locale: Locale(identifier: "en_US")) let alwaysStyle = defaultStyle.sign(strategy: .always(includingZero: false)) let nums = [-2.1, -1.2, 0, 1.4, 2.5] let defaultNums = nums.map { defaultStyle.format($0) } // ["-2.1", "-1.2", "0", "1.4", "2.5"] let alwaysNums = nums.map { alwaysStyle.format($0) } // ["-2.1", "-1.2", "0", "+1.4", "+2.5"]

## See Also

### Customizing style behavior

- [decimalSeparator(strategy:)](foundation/floatingpointformatstyle/decimalseparator(strategy:).md)
- [grouping(_:)](foundation/floatingpointformatstyle/grouping(_:).md)
- [locale(_:)](foundation/floatingpointformatstyle/locale(_:).md)
- [notation(_:)](foundation/floatingpointformatstyle/notation(_:).md)
- [precision(_:)](foundation/floatingpointformatstyle/precision(_:).md)
- [rounded(rule:increment:)](foundation/floatingpointformatstyle/rounded(rule:increment:).md)
- [scale(_:)](foundation/floatingpointformatstyle/scale(_:).md)
- [FloatingPointFormatStyle.Configuration](foundation/floatingpointformatstyle/configuration.md)
- [NumberFormatStyleConfiguration](foundation/numberformatstyleconfiguration.md)