솔루션 const solution = (my_string) => { const str = [...my_string]; console.log(str); const answer = str .map((v) => (v === v.toUpperCase() ? v.toLowerCase() : v.toUpperCase())) .join(""); console.log(answer); return answer; }; 솔루션 const solution = (my_string) => { let answer = ""; for (const str of my_string) { answer += str === str.toLowerCase() ? str.toUpperCase() : str.toLowerCase(); } console..