58. 最后一个单词的长度
58. 最后一个单词的长度
题目
Given a string s
consisting of words and spaces, return the length of the last word in the string.
A word is a maximal substring consisting of non-space characters only.
Example 1:
Input: s = "Hello World"
Output: 5
Explanation: The last word is "World" with length 5.
Example 2:
Input: s = " fly me to the moon "
Output: 4
Explanation: The last word is "moon" with length 4.
Example 3:
Input: s = "luffy is still joyboy"
Output: 6
Explanation: The last word is "joyboy" with length 6.
Constraints:
1 <= s.length <= 10^4
s
consists of only English letters and spaces' '
.- There will be at least one word in
s
.
题目大意
给你一个字符串 s
,由若干单词组成,单词前后用一些空格字符隔开。返回字符串中最后一个单词的长度。单词 是指仅由字母组成、不包含任何空格字符的最大子字符串。
解题思路
- 先
trim
过滤掉尾部的空格,再用最后一个字符的下标,减去最后一个空格下标,即为单词的长度。
代码
/**
* @param {string} s
* @return {number}
*/
var lengthOfLastWord = function (s) {
s = s.trim();
return s.length - 1 - s.lastIndexOf(' ');
};