DoubleFunction (Java SE 12 & JDK 12 )
Keywords: java.util.function.DoubleFunction interface

Module java.base
Package java.util.function

## 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 Detail

    - #### apply

          R apply​(double value)

      Applies this function to the given argument.
      Parameters:
        `value` - the function argument
      Returns:
        the function result