May-5 2020 Challenge

5. First Unique Character in a String

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.

Solution in JavaScript :

/**

* @param {string} s

* @return {number}

var firstUniqChar = function(s) {

for (i=0; i < s.length; i++) {

if (s.indexOf(s[i]) == s.lastIndexOf(s[i])) {

return i

}

return -1

};

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