F＃是否与Haskell相当？ [英] Does F# have an equivalent to Haskell's take?

问题描述

在Haskell中，有一个函数take n list，它返回列表中的前n个元素。例如，sum（take 3 xs）总结列表xs中的前三个元素。 F＃有相同的吗？我认为它是列表功能之一，但我无法找到任何似乎匹配的东西。

解决方案

是的，它叫做 Seq.take 。用法看起来与Haskell相同： Seq.take count source 。 要在列表中使用它，请使用 List.toSeq 。（更新：显然来自评论，这是没有必要的。）

In Haskell, there is a function "take n list" which returns the first n elements from a list. For example "sum (take 3 xs)" sums up the first three elements in the list xs. Does F# have an equivalent? I expected it to be one of the List-functions, but I can't spot anything that seems to match.

解决方案

Yeah, it's called Seq.take. Usage seems to be identical to Haskell's: Seq.take count source. To use it on a list, use List.toSeq first. (Update: Apparently from the comments, this isn't necessary.)

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