Uses of Interface
java8.util.function.ToDoubleFunction

Packages that use ToDoubleFunction

Package	Description
java8.util	Provides some of the new java.util classes and implementations of static and default interface methods added in Java 8 and, in addition, the JEP 269: Convenience Factory Methods for Collections that were introduced in Java 9.
java8.util.stream	Classes to support functional-style operations on streams of elements, such as map-reduce transformations on collections.

Uses of ToDoubleFunction in java8.util

Methods in java8.util with parameters of type ToDoubleFunction

Modifier and Type	Method and Description
static <T> Comparator<T>	Comparators.comparingDouble(ToDoubleFunction<? super T> keyExtractor) Accepts a function that extracts a double sort key from a type T, and returns a Comparator<T> that compares by that sort key.
static <T> Comparator<T>	Comparators.thenComparingDouble(Comparator<? super T> this_, ToDoubleFunction<? super T> keyExtractor) Returns a lexicographic-order comparator with a function that extracts a double sort key.

Uses of ToDoubleFunction in java8.util.stream

Methods in java8.util.stream with parameters of type ToDoubleFunction

Modifier and Type	Method and Description
static <T> Collector<T,?,Double>	Collectors.averagingDouble(ToDoubleFunction<? super T> mapper) Returns a Collector that produces the arithmetic mean of a double-valued function applied to the input elements.
DoubleStream	Stream.mapToDouble(ToDoubleFunction<? super T> mapper) Returns a DoubleStream consisting of the results of applying the given function to the elements of this stream.
static <T> Collector<T,?,DoubleSummaryStatistics>	Collectors.summarizingDouble(ToDoubleFunction<? super T> mapper) Returns a Collector which applies an double-producing mapping function to each input element, and returns summary statistics for the resulting values.
static <T> Collector<T,?,Double>	Collectors.summingDouble(ToDoubleFunction<? super T> mapper) Returns a Collector that produces the sum of a double-valued function applied to the input elements.