LeetCode242v2.js

var isAnagram = function(s, t) {
    if(s.length != t.length) return false;
    let tb = {};
    for(let i = 0 ; i < s.length ; i++){
        let letter = s[i];
        if(tb[letter]){
            tb[letter]++;
        }else{
            tb[letter] = 1;
        }
    }
    
    for(let i = 0 ; i< t.length ; i++){
        let letter = t[i];
        if(tb[letter]){
           tb[letter]--;
        }else{
            return false;
        }
        if(tb[letter] < 0 ){
            return false;
        }
    }
    return true;
};