[Code Signal][js] commonCharacterCount

🎆문제

Given two strings, find the number of common characters between them.

Example

For s1 = "aabcc" and s2 = "adcaa", the output should be
commonCharacterCount(s1, s2) = 3.

Strings have 3 common characters - 2 "a"s and 1 "c".

🎇풀이

function commonCharacterCount(s1, s2) {
    const s1arr = s1.split('');
    const s2arr = s2.split('');
    let count = 0;
    for(i = 0; i < s1arr.length; i++) {
        if(s2arr.includes(s1arr[i])) {
            count++;
            s2arr.splice(s2arr.indexOf(s1arr[i]), 1)
        }
    }
    return count;
}

✨다른 풀이

function commonCharacterCount(s1, s2) {
    for (var i = 0; i < s1.length; i++) {
        s2 = s2.replace(s1[i], "!");
    }
    return s2.replace(/[^!]/g, "").length;
}

정규표현식을 사용했다.