2124-Check-if-All-A's-Appears-Before-All-B's.js

// 2124. Check if All A's Appears Before All B's [Easy]
// https://leetcode.com/problems/check-if-all-as-appears-before-all-bs/

/**
 * @param {string} s
 * @return {boolean}
 */
const checkString = (s) => {
  const lastAIdx = s.lastIndexOf('a');
  const firstBIdx = s.indexOf('b');

  if (lastAIdx === -1 || firstBIdx === -1) return true;
  return firstBIdx > lastAIdx;
};