什么是在Haskell中添加列表的惯用方法？ [英] What is an idiomatic way to add lists in Haskell?

问题描述

假设我想在Haskell中添加两个列表。

以下是我所做的：

  addLists ::（Integral a）=> [a]  - > [a]  - > [a] 
 addLists xs ys = map add $ zip xs ys 
其中add（x，y）= x + y 
  

解决方案

zipWith 库函数，它使用提供的函数组合两个列表。它完全符合你在这里的要求，并得到：

  addLists = zipWith（+）
  

它使用（+）来组合作为更多参数给出的列表元素。 / p>

Suppose I want to add two lists in Haskell. What is the most usual way to do this?

Here's what I did:

addLists :: (Integral a) => [a] -> [a] -> [a]
addLists xs ys = map add $ zip xs ys
    where add (x, y) = x+y

解决方案

There is a zipWith library function that combines two lists by using a supplied function. It does exactly what you want here and you get:

addLists = zipWith (+)

This uses (+) to combine the elements of lists given as further arguments.

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