Problem

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 <= 104 s consists of only English letters and spaces ‘ ‘. There will be at least one word in s.

Pre analysis

In JS, you can split by spce, filter non empty string and return length of last element. But via code, will have to iterate from end and check for space and return length of word.

Another solution

return s.trimEnd().split(' ').pop().length