Function addFrequency

javascript/0242-valid-anagram.js:42–49

(str, map)

};

const addFrequency = (str, map) => {
    for (const char of str) {
        /* Time O(N) */
        const count = (map.get(char) || 0) + 1;

        map.set(char, count); /* Space O(1) */
    }
};

const subtractFrequency = (str, map) => {
    for (const char of str) {