# ToDoubleFunction

Added in[API level 24](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels)

# ToDoubleFunction

```
@FunctionalInterface interface ToDoubleFunction<T : Any!>
```

|----------------------------------------------------------------------------------------------------------------------------|
| [java.util.function.ToDoubleFunction](https://developer.android.com/reference/kotlin/java/util/function/ToDoubleFunction#) |

Represents a function that produces a double-valued result. This is the`double`-producing primitive specialization for[Function](https://developer.android.com/reference/kotlin/java/util/function/Function).

This is a[functional interface](https://developer.android.com/reference/kotlin/java/util/function/package-summary)whose functional method is[applyAsDouble(java.lang.Object)](https://developer.android.com/reference/kotlin/java/util/function/ToDoubleFunction#applyAsDouble(java.util.function.ToDoubleFunction.T)).

## Summary

|                                                                                                                                                 Public methods                                                                                                                                                  ||
|------------------------------------------------------------------------------------------|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| abstract[Double](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-double/index.html) | [applyAsDouble](https://developer.android.com/reference/kotlin/java/util/function/ToDoubleFunction#applyAsDouble(java.util.function.ToDoubleFunction.T))`(`value:` `T`)` Applies this function to the given argument. |

## Public methods

### applyAsDouble

Added in[API level 24](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels)  

```
abstract fun applyAsDouble(value: T): Double
```

Applies this function to the given argument.

|            Parameters            ||
|---------|-------------------------|
| `value` | T:the function argument |

|                                                Return                                                 ||
|----------------------------------------------------------------------------------|---------------------|
| [Double](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-double/index.html) | the function result |