查找并返回javascript中最长的单词

Question

有人可以让我知道这里出了什么问题吗？ 每当我将其输入为测试用例时（console.log（longestWord（“到底发生了什么事”）），当最长的单词返回“ what”时，它几乎可以在我测试过的所有其他情况下使用...让我发疯，请帮忙，谢谢！！！

function longestWord(string) {
var words = string.split(' ');

for (var i = 0; i < words.length; i++) {
    var currentWord = words[i];

    var longestWord = words[0];

    if (longestWord.length < currentWord.length) {
         longestWord = currentWord;
    }
}
return longestWord;
}

Answer 1

您正在循环的每次迭代中重置最长的单词。 在循环运行之前设置初始（第一个）最长的字，然后它将正常工作。

 function longestWord(string) { var words = string.split(' '); // Set the intial longest word out here var longestWord = words[0]; // Need to loop through from index 1 for (var i = 1; i < words.length; i++) { var currentWord = words[i]; // Setting the longest word to the initial word here means that it will set the longest word to be "what" everytime your loop runs. if (longestWord.length < currentWord.length) { longestWord = currentWord; } } return longestWord; } console.log(longestWord("What the hell is going on")); 

Answer 2

乔丹给您正确的答案。 我们还可以使用sort函数并返回第一个元素，如下所示：

 function longestWord(string) { var words = string.split(' '); return words.sort(function (a, b) { return b.length - a.length; })[0]; } console.log(longestWord("what the hell is going on")) 

Answer 3

我贴上ES6单线纸，以防万一...

 let longestWord = str => str.split(' ').sort((a, b) => b.length - a.length)[0]; console.log(longestWord("what the hell is going on"));