如何找到列表中最长的单词？ [英] How to find the longest word in list?

问题描述

我无法以功能性思维方式让我的头脑以简单的方式解决这个问题，这种方式也适用于很长的列表。如果您有以下列表：

I can't get my mind in a functional mindset to solve this problem in a simple way that could also work for very long lists. If you have a list like:

["one", "two", "three", "four", "five"]

我可以简单地说出最长单词的长度：

I can tell what the length of the longest word is pretty simply with:

maximum $ map length ["one", "two", "three", "four", "five"]

如何修改前面的语句来返回字符串 3 ？

How would I modify the previous statement to return the string three?

推荐答案

使用 maximumBy ， on 和 compare 你可以这样写表达式：

Using maximumBy, on and compare you can write the expression like this:

import Data.List (maximumBy)
import Data.Function (on)

maximumBy (compare `on` length)  ["one", "two", "three", "four", "five"]

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