Given a string, find the first non-repeating character in it and return it‘s index. If it doesn‘t exist, return -1.
Examples:
s = "leetcode" return 0. s = "loveleetcode", return 2.
Note: You may assume the string contain only lowercase letters.
/** * @param {string} s * @return {number} */ var firstUniqChar = function(s) { if (!s.length) { return -1; } let hashed = {}; for (let i = 0; i < s.length; i++) { const val = s[i]; if (val in hashed) { hashed[val] = -1; } else { hashed[val] = i; } } const result = Object.values(hashed).find(e => e >= 0); return result === undefined ? -1: result; };
[Algorithm] 387. First Unique Character in a String
原文：https://www.cnblogs.com/Answer1215/p/12037613.html