找到一个字符串中最长的单词？ [英] Find the longest word in a string?

问题描述

到目前为止，我有：

 函数findLongestWord（str）{
 var words = []; 
 var longest = []; 
 words.push（str.split（））; 
 for（var i = 0; i  if（words [i] .length> longest [0] .length）{
 longest.push （字[I]）; 
} 
} 
 return longest [0] .length; 
 
 
 findLongestWord（'快速的棕色狐狸跳过懒狗'）; 
  

这对我来说非常合理，但是却给我一个错误。我尝试了console.logging的每一步，并绕着for循环失败。

解决方案

当您使用 .push（str.split（）），数组 words 看起来像

  [
 [，quick，brown，fox，jumped，over，the，lazy狗] 
] 
  

另一个问题是当您检查最长的[0] .length 用于中的第一次迭代，它是 undefined 。这导致错误
$ b

未捕获TypeError：无法读取未定义的属性'length'

为了解决这个问题，你可以使用最长的作为 string ，而不是阵列。在中为分配长度长度大于当前长度最长的字符串



在函数结尾处，可以返回最长的字符串

问题/建议：
$ b

1. str.split（''）直接赋值给字变量


2. 使用最长的作为字符串变量而不是数组<$ code>和 initialize 它为空字符串，即''，以避免上述错误

3. 将最长的的长度与字数组中的字符串进行比较


4. 如果 words 数组中的字符串长度大于 longest ，则更新最长。


5. 使用 \ s + 至分割空格字符串

function findLongestWord （str）{var words = str.split（/ \s + /）; var longest =''; for（var i = 0; i




I am trying to write a basic javascript function to find the longest word in a string and log it's length.

So far I have:

function findLongestWord(str) {
  var words = [];
  var longest = [];
  words.push(str.split(" "));
  for(var i = 0; i < words.length; i++){
    if (words[i].length > longest[0].length){
      longest.push(words[i]);
    }
  }
  return longest[0].length;
}

findLongestWord('The quick brown fox jumped over the lazy dog');

It makes perfect sense to me, yet it gives me an error. I tried console.logging each step and it fails around the for loop.

解决方案

When you use words.push(str.split(" ")), the array words looks like

[
    ["The", "quick", "brown", "fox", "jumped", "over", "the", "lazy", "dog"]
]

Another problem is that when you check longest[0].length for the first iteration in the for, it is undefined. Which results in the error

Uncaught TypeError: Cannot read property 'length' of undefined

To solve this, you can use longest as string instead of array. And in the for, assign the string having the length greater than the current longest string to it.

At the end of the function, you can return the longest string.

Problems/Suggestions:

1. Use str.split(' ') to directly assignment to words variable
2. Use longest as string variable instead of array and initialize it to empty string, i.e. '', to avoid the above error
3. Compare the length of the longest with the string in the words array
4. If the length of the string in words array is greater than the longest, update the longest.
5. Use \s+ to split the string by spaces

function findLongestWord(str) {
  var words = str.split(/\s+/);
  var longest = '';

  for (var i = 0; i < words.length; i++) {
    if (words[i].length > longest.length) {
      longest = words[i];
    }
  }
  return longest;
}

var longestWord = findLongestWord('The quick brown fox jumped over the lazy dog');

document.write('Longest Word: "' + longestWord + '"');
document.write('<br />Longest Word Length: ' + longestWord.length);

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