Link코딩테스트 연습 - 핸드폰 번호 가리기 문제풀이(1)function solution(phone_number) { let len = phone_number.length; return phone_number.split('').map((curr, idx) => idx (2)function solution(phone_number){ return s.replace(/\d(?=\d{4})/g, "*");}(3)function solution(s){ let result = "*".repeat(s.length - 4) + s.slice(-4); return result;}(4)const solution = n => [...n].fill("*",0,n.length-4).join("")