function solution(s, n) {
let arr = s.split('');
for(let i = 0; i < arr.length; i++){
if(arr[i] != ' '){
arr[i] = arr[i].charCodeAt(0);
arr[i] >= 97 ?
arr[i] + n > 122 ?
arr[i] = 97 + (arr[i] + n - 123) :
arr[i] = arr[i] + n :
arr[i] + n > 90 ?
arr[i] = 65 + (arr[i] + n - 91) :
arr[i] = arr[i] + n
arr[i] = String.fromCharCode(arr[i]);
}
}
return arr.join('');
}
성공