function solution(n) {
let a='';
for (let i=1; i<=n; i++) {
if (i%2===1) a+='수';
else a+='박';
}
return a;
}
console.log(solution(3));
slice
const waterMelon = n => "수박".repeat(n).slice(0,n);
repeat
const waterMelon = n => {
return '수박'.repeat(n/2) + (n%2 === 1 ? '수' : '');
}