Leetcode - 58. Length of Last Word

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

Solution 1

/**
 * @param {string} s
 * @return {number}
 */
var lengthOfLastWord = function (s) {
  let start;
  let end;

  for (let i = s.length - 1; i >= 0; i--) {
    if (s[i] !== ' ') {
      start = i;
      break;
    }
  }

  for (let j = start; j >= 0; j--) {
    if (s[j] === ' ') {
      end = j;
      break;
    }
  }

  if (end === undefined) {
    return start + 1;
  }
  return start - end;
};