솔루션 const solution = (id_pw, db) => { const [id, pw] = id_pw; const answer = db.find(([_id, _pw]) => _id === id && _pw === pw) ? "login" : !db.find(([_id]) => _id === id) ? "fail" : "wrong pw"; console.log(answer); return answer; }; 솔루션 const solution = (id_pw, db) => { const [id, pw] = id_pw; const map = new Map(db); const answer = map.has(id) ? map.get(id) === pw ? "login" : "wrong pw" : "fail..