如何在Java 8中将函数列表应用于值? [英] How to apply a list of functions to a value in Java 8?

问题描述

假设我有以下命令代码:

Let's say I have this imperative code:

    List<Function<T, T>> functions = ...
    T value = ...
    for (Function<T, T> function : functions) {
        value = function.apply(value);
    }

我该如何以功能样式(例如Scala中的折叠方式)编写代码?

How do I write this in the functional style (like what fold does in Scala)?

推荐答案

这是几个小时前才问到的 Consumer ...，您可以将它们简化为一个函数并将其应用:

This has just been asked a few hours ago for a Consumer... You could reduce them to a single function and apply that:

@SafeVarargs
private static <T> Function<T, T> combineF(Function<T, T>... funcs) {
    return Arrays.stream(funcs).reduce(Function.identity(), Function::andThen);
}

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