[CodeKata] 핸드폰 번호 가리기

링크

• https://programmers.co.kr/learn/courses/30/lessons/12948?language=javascript

참고

• https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/substr
• https://stackoverflow.com/questions/27545202/masking-last-4-digits-in-javascript/27545357#27545357
• https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/repeat
• https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/slice

나의 풀이

const solution = (phone_number) => {
  const lastFourDigit = phone_number.substr(phone_number.length - 4);
  const restLength = phone_number.length - lastFourDigit.length;
  let stars = '';
  for(let i = 0; i < restLength; i++) {
    stars += '*';
  }
  return stars + lastFourDigit;
};

substr() 👎👎👎👎👎
...
substr() 사용하지말자...

정규식을 사용한 풀이... 😱

function solution(phone_number) {
  return s.replace(/\d(?=\d{4})/g, "*");
}

repeat와 slice를 사용한 풀이 👍

function solution(phone_number){
  var result = "*".repeat(s.length - 4) + s.slice(-4);

  return result;
}