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.
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> java.util.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> java.util.Comparator<T>	Comparators.thenComparingDouble(java.util.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,?,java.lang.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,?,java.lang.Double>	Collectors.summingDouble(ToDoubleFunction<? super T> mapper) Returns a Collector that produces the sum of a double-valued function applied to the input elements.