Length of last word [https://leetcode.com/problems/length-of-last-word]

length_of_last_word.js

/**
 * @param {string} s
 * @return {number}
 */
var lengthOfLastWord = function(s) {
    let maxWordLength = 0;
    let startCollecting = false;

    for (let i = s.length - 1; i >= 0; i--) {
         if (s[i] === ' ' && startCollecting) {
             return maxWordLength;
         }

         if (s[i] !== ' ') {
            maxWordLength++;
            startCollecting = true;
         }
    }

    return maxWordLength;
};