# 58. Length of Last Word

## 題目概要

給定一個字串，輸出最後一個單字的長度。

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.

## 解題技巧

- 如果用 split 分隔字串，最後一個元素可能會是空字串而不是單字，所以要先將空字串篩掉再輸出。

## 程式碼

/**
 * @param {string} s
 * @return {number}
 */
var lengthOfLastWord = function(s) {
    const arr = s.split(" ").filter(item => item);
    return arr[arr.length - 1].length;
};