F# 是否与 Haskell 的看法等效? [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)"对列表 xs 中的前三个元素求和.F# 有等价物吗?我希望它是 List 函数之一，但我找不到任何似乎匹配的东西.

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.

推荐答案

是的，它叫做 Seq.take.用法似乎与 Haskell 的相同:Seq.take count source.要在列表中使用它，请使用 List.toSeq 首先.(更新:显然从评论来看，这不是必需的.)

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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