# Interface DoubleFunction<R>

Type Parameters:
  `R` - the type of the result of the function

Functional Interface:
  This is a functional interface and can therefore be used as the assignment target for a lambda expression or method reference.

@FunctionalInterface public interface DoubleFunction<R>
Represents a function that accepts a double-valued argument and produces a result. This is the `double`-consuming primitive specialization for `Function`.

This is a functional interface whose functional method is `apply(double)`.

Since:
  1.8
See Also:
  - `Function`

## Method Summary

Modifier and Type
Method
Description
`R`
`apply(double value)`
Applies this function to the given argument.

## Method Details

### apply

R apply(double value)
Applies this function to the given argument.

Parameters:
  `value` - the function argument
Returns:
  the function result