Encode and Decode Strings

var encode = function (strs) {    let res = '';    for (let char of strs) {        res += (char.length).toString() + `#` + char;    }    return res;}var decode = function (s) {    let res = [];    for (let i = 0; i < s.length; i++) {        let j = i;        while (s[j] != '#') {            j++;        }        let wordLength = parseInt(s.substring(i, j));        res.push(s.substring(j + 1, j + 1 + wordLength));        i = j + wordLength;    }    return res;}