在Clojure Core或Contrib中有Zip函数的等价物吗？ [英] Is there an equivalent for the Zip function in Clojure Core or Contrib?

问题描述

在Clojure中，我想要组合两个列表以提供对的列表，

In Clojure, I want to combine two lists to give a list of pairs,

> (zip '(1 2 3) '(4 5 6))  
((1 4) (2 5) (3 6))

在Haskell或Ruby中，函数称为 zip 。实现并不困难，但我想确保我没有在Core或Contrib中缺少一个函数。

In Haskell or Ruby the function is called zip. Implementing it is not difficult, but I wanted to make sure I wasn't missing a function in Core or Contrib.

有一个 zip 命名空间，但它是描述了作为提供对拉链功能技术的访问，这似乎不是我的后续。

There is a zip namespace in Core, but it is described as providing access to the Zipper functional technique, which does not appear to be what I am after.

有一个等效的功能，用于组合2个或更多的列表，以这种方式，在Core？

Is there an equivalent function for combining 2 or more lists, in this way, in Core?

如果没有，是否因为有一个惯用的方法，使函数不需要？

If there is not, is it because there is an idiomatic approach that renders the function unneeded?

推荐答案

(map vector '(1 2 3) '(4 5 6))

会执行您想要的操作：

=> ([1 4] [2 5] [3 6])

Haskell需要< c $ c> zipWith （ zipWith3 ， zipWith4 ，...）他们都需要具有特定的类型;特别是，他们接受的输入列表的数量需要固定。 （ zip ， zip2 ， zip3 ，...家庭可以被视为 zipWith 家族中用于tupling的常见用例的专业化）。

Haskell needs a collection of zipWith (zipWith3, zipWith4, ...) functions, because they all need to be of a specific type; in particular, the number of input lists they accept needs to be fixed. (The zip, zip2, zip3, ... family can be regarded as a specialisation of the zipWith family for the common use case of tupling).

，Clojure等lsps对变量arity函数有很好的支持; map 是其中之一，可以类似于Haskell的方式用于tupling

In contrast, Clojure and other Lisps have good support for variable arity functions; map is one of them and can be used for "tupling" in a manner similar to Haskell's

zipWith (\x y -> (x, y))

在Clojure中构建一个元组的方法是构造一个简短的向量，如上所示。

The idiomatic way to build a "tuple" in Clojure is to construct a short vector, as displayed above.

（为了完整性，注意Haskell有一些基本的扩展变量arity函数;使用它们需要很好地理解语言，但是Haskell 98可能根本不支持它们，因此固定的函数对于标准库是优选的。）

(Just for completeness, note that Haskell with some basic extensions does allow variable arity functions; using them requires a good understanding of the language, though, and the vanilla Haskell 98 probably doesn't support them at all, thus fixed arity functions are preferrable for the standard library.)

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