[Algorithm] 30 week(8.15 ~ 8.21) 2/3

387. First Unique Character in a String

var firstUniqChar = function(s) {
    let strings = {};
	
    for(let char of s){
      strings[char] = strings[char] + 1 || 1;
    }
	
     for(let i = 0; i < s.length; i++){
       if(strings[s[i]] === 1){
         return i;
       };
     }
    
     return -1;
    
};