在字符串中找到最长的单词不起作用

Question

我应该在字符串中找到最长的单词，这是我到目前为止提出的代码。不幸的是，这似乎不起作用，我的问题是为什么？

function findLongestWordLength(str) { 

  str.split("");

  let longest = 1;

  for(let i = 0; i < str.length; i++){

    if (str[i].length > longest){

       longest = str[i].length;

    }

  }

  return longest;

}

Answer 1

您需要将字符串分割为" "。然后遍历单词并返回最大的长度。function findLongestWordLength(str) {&nbsp; const words = str.split(" ");&nbsp; return words.reduce(&nbsp; &nbsp; (max, word) => (word.length > max ? word.length : max),&nbsp; &nbsp; 0&nbsp; );}console.log(findLongestWordLength("hello world"));由于使用，此解决方案更短，更清洁reduce。

Answer 2

问题是第二行需要更改为， str = str.split(" ");因为字符串是不可变的，它们不能更改，需要重新分配它。function findLongestWordLength(str) {&nbsp;&nbsp; str = str.split(" ");&nbsp; let longest = 1;&nbsp; console.log(str);&nbsp; for(let i = 0; i < str.length; i++){&nbsp; &nbsp; if (str[i].length > longest){&nbsp; &nbsp; &nbsp; &nbsp;longest = str[i].length;&nbsp; &nbsp; }&nbsp; }&nbsp; return longest;}var result = findLongestWordLength("Joan Ala Valeron")console.log(result);