let s = [97, 97, 97, 97, 95, 86, 85, 75, 66, 55];
let arr = [];
let count = 0;
for (let i = 0; i < s.length; i++) {
if (arr.length < 3 && !arr.includes(s[i])) {
arr.push(s[i]);
}
}
for (let j = 0; j < s.length; j++) {
if (arr.includes(s[j])) {
count ++
}
}
console.log(count);
while문을 이용해보자.