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# doubleValue

The floating-point value of the string as a `double`.

```
var doubleValue: Double { get }
```

## Discussion

This property doesn’t include any whitespace at the beginning of the string. This property is `HUGE_VAL` or `–HUGE_VAL` on overflow, `0.0` on underflow. This property is `0.0` if the string doesn’t begin with a valid text representation of a floating-point number.

This property uses formatting information stored in the non-localized value; use an [`Scanner`](/documentation/Foundation/Scanner) object for localized scanning of numeric values from a string.

## See Also

[`scanDouble(_:)`](/documentation/Foundation/Scanner/scanDouble(_:))

Scans for a double value, returning a found value by reference.


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