0387-first-unique-character-in-a-string.js

/**
 * 387. First Unique Character in a String
 * https://leetcode.com/problems/first-unique-character-in-a-string/
 * Difficulty: Easy
 *
 * Given a string, find the first non-repeating character in
 * it and return it's index. If it doesn't exist, return -1.
 */

/**
 * @param {string} s
 * @return {number}
 */
var firstUniqChar = function(s) {
  for (let i = 0; i < s.length; i++) {
    if (s.indexOf(s.charAt(i)) === s.lastIndexOf(s.charAt(i))) {
      return i;
    }
  }

  return -1;
};