减少期货清单 [英] Reducing a list of futures

问题描述

我有个运行时间长的函数，返回的未来如下：

I have long running function that returns a future as follows:

def longRunningFunction(signs: List[String], numOfWords: Int)
    : Future[List[(String, Int)]] = Future{ /* computation */ }

我需要按以下方式减少Future的输出：

I need to reduce the output of the Future as follows:

val all = (6 to 24).map(i => longRunningFunction(signs, i))
                   .reduce(_ ::: _)

但这似乎不起作用。有什么想法吗？

But this does not seem to work. Any thoughts?

推荐答案

Future.reduce(futures)(_ ::: _)

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