# Functions

The following functions are available globally.

### Operators

• ``` √(_:) ```

SwifterSwift: Square root of double.

#### Declaration

Swift

``public prefix func √ (double: Double) -> Double``

#### Parameters

 ``` double ``` double value to find square root for.

#### Return Value

square root of given double.

• ``` √(_:) ```

SwifterSwift: Square root of float.

#### Declaration

Swift

``public prefix func √ (float: Float) -> Float``

#### Parameters

 ``` float ``` float value to find square root for

#### Return Value

square root of given float.

• ``` ±(_:) ```

SwifterSwift: Tuple of plus-minus operation.

#### Declaration

Swift

``public prefix func ± <T>(number: T) -> (T, T) where T : FloatingPoint``

#### Parameters

 ``` int ``` number

#### Return Value

tuple of plus-minus operation (± 2.5 -> (2.5, -2.5)).

• ``` √(_:) ```

SwifterSwift: Square root of integer.

#### Declaration

Swift

``public prefix func √ (int: Int) -> Double``

#### Parameters

 ``` int ``` integer value to find square root for

#### Return Value

square root of given integer.

• ``` ±(_:) ```

SwifterSwift: Tuple of plus-minus operation.

#### Declaration

Swift

``public prefix func ± (int: Int) -> (Int, Int)``

#### Parameters

 ``` int ``` integer number

#### Return Value

tuple of plus-minus operation (example: ± 2 -> (2, -2)).