Javascript reduce()查找字符串中最短的单词

本文介绍了Javascript reduce()查找字符串中最短的单词的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

我有一个函数，可以找到字符串中最长的单词.

I have a function that finds the longest word in a string.

function findLongestWord(str) { var longest = str.split(' ').reduce((longestWord, currentWord) =>{ return currentWord.length > longestWord.length ? currentWord : longestWord; }, ""); return longest; } console.log(findLongestWord("The quick brown fox jumped over the lazy dog"));

我很难转换成最短的单词.为什么我不能只更改 currentWord.length>longestWord.length 到 currentWord.length<longestWord.length ?

I'm having a hard time converting this to find the shortest word. Why can't I just change currentWord.length > longestWord.length to currentWord.length < longestWord.length?

推荐答案

您需要为 reduce 函数提供一个初始值，否则空白字符串是最短的单词:

You need to provide an initial value to the reduce function, otherwise a blank string is the shortest word:

function findShortestWord(str) { var words = str.split(' '); var shortest = words.reduce((shortestWord, currentWord) => { return currentWord.length < shortestWord.length ? currentWord : shortestWord; }, words[0]); return shortest; } console.log(findShortestWord("The quick brown fox jumped over the lazy dog"));