Jewels and Stones

script.js

// https://leetcode.com/problems/jewels-and-stones/

var numJewelsInStones = function(J, S) {
    let arrJ = J.split("");
    let arrS = S.split("");
    let counter = 0;

    for (let i = 0; i < arrS.length; i++) {
        if (arrJ.includes(arrS[i])) {
            counter++;
        }
    }
    return counter;
};